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Sun Java Web Start Plugin Command Line Argument Injection

This module exploits a flaw in the Web Start component of the Sun Java Runtime Environment. The arguments passed to Java Web Start are not properly validated, allowing injection of arbitrary arguments to the JVM. By utilizing the lesser known -J option, an attacker can take advantage of the -XXaltjvm option, as discussed previously by Ruben Santamarta. This method allows an attacker to execute arbitrary code in the context of an unsuspecting browser user. In order for this module to work, it must be ran as root on a server that does not serve SMB. Additionally, the target host must have the WebClient service (WebDAV Mini-Redirector) enabled.

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Module Name



  • jduck <jduck [at]>



  • Automatic
  • Java Runtime on Windows x86


  • windows


  • x86



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/windows/browser/java_ws_vmargs msf exploit(java_ws_vmargs) > show targets ...targets... msf exploit(java_ws_vmargs) > set TARGET <target-id> msf exploit(java_ws_vmargs) > show options and set options... msf exploit(java_ws_vmargs) > exploit

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