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Date: Mon, 02 Dec 2013 21:48:10 -0700
From: Kurt Seifried <kseifried@...hat.com>
To: oss-security@...ts.openwall.com
Subject: Re: Command injection vulnerability in Ruby Gem sprout
 0.7.246

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Hash: SHA1

On 12/02/2013 05:13 PM, Larry W. Cashdollar wrote:
> Title: Command injection vulnerability in Ruby Gem sprout 0.7.246
> 
> Download: http://rubygems.org/gems/sprout,
> http://projectsprouts.org/
> 
> Vulnerability:
> 
> The unpack_zip() function contains the following code:
> 
> sprout-0.7.246/lib/sprout/archive_unpacker.rb
> 
> 60           zip_dir = File.expand_path(File.dirname(zip_file)) 61
> zip_name = File.basename(zip_file) 62           output =
> File.expand_path(dir) 63           # puts ">> zip_dir: #{zip_dir}
> zip_name: #{zip_name} output: #{output}    " 64           %x(cd
> #{zip_dir};unzip #{zip_name} -d #{output})
> 
> 
> If the attacker can control zip_dir, zip_name or output then they
> can possibly execute shell commands by injecting shell meta
> characters as input.
> 
> 
> PoC:
> 
> For example: filename;id;.zip
> 
> I contacted the developer a few weeks ago but received no
> response.
> 
> 
> Thanks! Larry W. Cashdollar @_larry0 
> http://vapid.dhs.org/advisories/
> 

Please use CVE-2013-6421 for this issue.

- -- 
Kurt Seifried Red Hat Security Response Team (SRT)
PGP: 0x5E267993 A90B F995 7350 148F 66BF 7554 160D 4553 5E26 7993
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