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Ruby Thumbshooter Gem 0.1.5 Remote Command Execution

Ruby Thumbshooter Gem 0.1.5 Remote Command Execution
Posted Mar 27, 2013
Authored by Larry W. Cashdollar

Ruby Thumbshooter Gem version 0.1.5 suffers from a remote command execution vulnerability due to passing unsanitized user-supplied data to the shell.

tags | exploit, remote, shell, ruby
MD5 | a1cba85e9724f097a54a9ce7b26faec5

Ruby Thumbshooter Gem 0.1.5 Remote Command Execution

Change Mirror Download
Ruby gem Thumbshooter 0.1.5 remote command 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$

Larry C$

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