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Message-id: <F2F0C2DD-8F71-47DF-BC09-19D96CAFB644@me.com>
Date: Tue, 26 Mar 2013 07:23:03 -0400
From: larry Cashdollar <larry0@...com>
To: Open Source Security <oss-security@...ts.openwall.com>
Subject: Ruby gem Thumbshooter 0.1.5 remote code execution
Ruby gem Thumbshooter 0.1.5 remote code execution
3/25/2013
Generates thumbshots of URLs by using Webkit and QT4.
https://github.com/digineo/thumbshooter
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
@_larry0
http://vapid.dhs.org/advisories/thumbshooter-ruby-gem-remoteexec.html
Larry C$
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