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Sun Java Web Start Double Quote Injection

This module exploits a flaw in the Web Start component of the Sun Java Runtime Environment. Parameters initial-heap-size and max-heap-size in a JNLP file can contain a double quote which is not properly sanitized when creating the command line for javaw.exe. This allows the injection of the -XXaltjvm option to load a jvm.dll from a remote UNC path into the java process. Thus an attacker can execute arbitrary code in the context of a browser user. This flaw was fixed in Oct. 2012 and affects JRE <= 1.6.35 and <= 1.7.07. In order for this module to work, it must be run as root on a server that does not serve SMB (In most cases, this means non-Windows hosts). Additionally, the target host must have the WebClient service (WebDAV Mini-Redirector) enabled. Alternatively, a UNC path containing a jvm.dll can be specified, bypassing the Windows limitation for the Metasploit host.

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Module Name



  • Rh0 <rh0 [at]>



  • Automatic
  • Java Runtime 1.6.31 to 1.6.35 and 1.7.03 to 1.7.07 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_double_quote msf exploit(java_ws_double_quote) > show targets ...targets... msf exploit(java_ws_double_quote) > set TARGET <target-id> msf exploit(java_ws_double_quote) > show options and set options... msf exploit(java_ws_double_quote) > exploit

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