Rgpg 0.2.2 Ruby Gem Remote Command Injection

["Larry W. Cashdollar" <larry0 () me com>]

Title: Rgpg 0.2.2 Ruby Gem Remote Command Injection

Date: 7/31/2013

Advisory Author: Larry W. Cashdollar, @_larry0

CVE: CVE-2013-4203

Download: https://rubygems.org/gems/rgpg

Description:
"A simple Ruby wrapper around gpg command for file encryption.
rgpg is a simple API for interacting with the gpg tool. It is specifically designed to avoid altering global keyring state 
by creating temporary public and secret keyrings on the fly for encryption and decryption."

Vulnerability:
The following code snippet does not sanitize user supplied input before passing it to the System () function for 
execution. If this ApI is used in the context of a rails application remote commands can be injected into the shell.
in lib/rgpg/gpg_helper.rb:

68       begin
69         outputfile.close
70         result = system("#{commandline} > #{output_file.path} 2>&1")
71       ensure
Author: Notified 8/1/2013.

Fixed: in 0.2.3. 8/1/2013.

URL: http://vapid.dhs.org/advisories/rgpg-api-rubygem-cmd-inj.html

Greets to all at DEFCON21.

_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/