oss-security - Remote command execution in Ruby Gem ldoce 0.0.2

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Message-id: <e5c674f9-fa62-4517-b3c3-5cc342cc409d@me.com>
Date: Sun, 31 Mar 2013 16:11:27 +0000 (GMT)
From: "Larry W. Cashdollar" <larry0@...com>
To: Open Source Security <oss-security@...ts.openwall.com>
Cc: Packet Storm <packet@...ketstormsecurity.org>
Subject: Remote command execution in Ruby Gem ldoce 0.0.2

Remote command execution in Ruby Gem ldoce 0.0.2
Larry W. Cashdollar
@_larry0
3/25/2013

Ldoce Ruby Gem:

Easily interface with the Longman Dictionary of Contemporary English API from Ruby:

NB currently mac only as it depends on the afplay command.

https://github.com/markburns/ldoce

Ldoce passes an mp3 url to commandline for audio output of the pronunciation of a dictonary word:

If the URL or filename for the mp3 files contain shell metacharacters code can be executed remotely as the client:

[./ldoce-0.0.2/lib/ldoce/word.rb]

      if mp3?
        unless File.exists? filename
          command = "curl #{mp3_url} -silent > {filename}"
          `{command}`
        end
        `afplay #{filename}`
      end

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