module

Java 7 Applet Remote Code Execution

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Disclosed
2012-08-26
Created
2018-05-30

Description

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.

Authors

Adam Gowdiak
James Forshaw
jduck jduck@metasploit.com
sinn3r sinn3r@metasploit.com
juan vazquez juan.vazquez@metasploit.com

Platform

Java,Linux,Windows

References

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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