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:

 1012       command << "xvfb-run -a --server-args='-screen 0, #{screen}x24' "
 1015     command << "{WEBKIT2PNG} '{url}' {args}"
 1016 
 1017     img    = `{command} 2>&1`

Larry W. Cashdollar
@_larry0
http://vapid.dhs.org