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Date: Tue, 26 Mar 2013 07:23:03 -0400
From: larry Cashdollar <>
To: Open Source Security <>
Subject: Ruby gem Thumbshooter 0.1.5 remote code execution

Ruby gem Thumbshooter 0.1.5 remote code execution

Generates thumbshots of URLs by using Webkit and QT4.

Specially crafted URLs can result in remote code execution if the URL contains shell metacharacters.

We see that the url is passed directly to the shell in the following code snippet from ./thumbshooter-0.1.5/lib/thumbshooter.rb lines:

 1012 command << "xvfb-run -a --server-args='-screen 0, #{screen}x24' " 
 1015 command << "{WEBKIT2PNG} '{url}' {args}"
 1017 img = `{command} 2>&1`
Larry W. Cashdollar

Larry C$

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