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Java 7 Applet Remote Code Execution

The exploit takes advantage of two issues in JDK 7: The ClassFinder and MethodFinder.findMethod(). Both were newly introduced in JDK 7. ClassFinder is a replacement for classForName back in JDK 6. It allows untrusted code to obtain a reference and have access to a restricted package in JDK 7, which can be used to abuse sun.awt.SunToolkit (a restricted package). With sun.awt.SunToolkit, we can actually invoke getField() by abusing findMethod() in Statement.invokeInternal() (but getField() must be public, and that's not always the case in JDK 6) in order to access Statement.acc's private field, modify AccessControlContext, and then disable Security Manager. Once Security Manager is disabled, we can execute arbitrary Java code. Our exploit has been tested successfully against multiple platforms, including: IE, Firefox, Safari, Chrome; Windows, Ubuntu, OS X, Solaris, etc.

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Module Name

exploit/multi/browser/java_jre17_exec

Authors

  • Adam Gowdiak
  • James Forshaw
  • jduck <jduck [at] metasploit.com>
  • sinn3r <sinn3r [at] metasploit.com>
  • juan vazquez <juan.vazquez [at] metasploit.com>

References

Targets

  • Generic (Java Payload)
  • Windows Universal
  • Linux x86

Platforms

  • java
  • linux
  • windows

Architectures

  • java
  • x86

Reliability

Development

Module Options

To display the available options, load the module within the Metasploit console and run the commands 'show options' or 'show advanced':

msf > use exploit/multi/browser/java_jre17_exec msf exploit(java_jre17_exec) > show targets ...targets... msf exploit(java_jre17_exec) > set TARGET <target-id> msf exploit(java_jre17_exec) > show options ...show and set options... msf exploit(java_jre17_exec) > exploit

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