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Recursive Interpolation Vulnerability in Cocaine rubygem (CVE-2013-4457)
From: Jon Yurek <jyurek () thoughtbot com>
Date: Tue, 22 Oct 2013 16:18:05 -0400

Recursive Interpolation Vulnerability in Cocaine rubygem

There is a vulnerability interpolating variabled recursively in Cocaine. This vulnerability has been assigned the CVE 
identifier CVE-2013-4457

Versions Affected:  0.4.x, 0.5.1, 0.5.2
Not affected:       0.3.x
Fixed Versions:     0.5.3


Due to the method of variable interpolation in Cocaine 0.4.0 to 0.5.2, an attacker may be able to inject hostile 
commands into a command line via a crafted hash object which are not properly escaped.

The impact is lessened on Ruby version 1.8.* because hashed are not ordered by default, and so an attacker must rely on 
luck for the attack to work.

An attack of this sort cannot take place if there is only one value being interpolated into the command line.

Users of the Paperclip gem are encouraged to upgrade to the latest version of Cocaine. Users of the 2.7 branch of 
Paperclip will not need to upgrade as the version of Cocaine it uses is not vulnerable to this attack.

Version 0.5.3 fixes the problem involved and is available at rubygems.org


Thanks to Holger Just for reporting this! 

Jon Yurek

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