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Date: Mon, 4 Jan 2016 17:09:15 -0800
From: Reed Loden <reed@...dloden.com>
To: oss-security@...ts.openwall.com
Subject: Remote Command Injection in Ruby Gem colorscore <=0.0.4
Title: Remote Command Injection in Ruby Gem colorscore <=0.0.4
Description: Finds the dominant colors in an image and scores them against
a user-defined palette, using the CIE2000 Delta E formula.
Homepage: https://github.com/quadule/colorscore
Download: https://rubygems.org/gems/colorscore
Affected versions: All (<=0.0.4 currently)
Vulnerability:
The contents of the `image_path`, `colors`, and `depth` variables generated
from possibly user-supplied input are passed directly to the shell on line
4. If a user supplies a value that includes shell metacharacters such as
';', an attacker may be able to execute shell commands on the remote system
as the user id of the Ruby process.
To resolve this issue, the aforementioned variables (especially
`image_path`) must be sanitized for shell metacharacters.
1 module Colorscore
2 class Histogram
3 def initialize(image_path, colors=16, depth=8)
4 output = `convert #{image_path} -resize 400x400 -format %c -dither
None -quantize YIQ -colors #{colors} -depth #{depth} histogram:info:-`
5 @lines = output.lines.sort.reverse.map(&:strip).reject(&:empty?)
6 end
CVE: CVE-2015-7541
Credits: Dirk Zittersteyn (@DZittersteyn)
History:
* 2015-12-04 -- Vendor notified
* 2015-12-05 -- CVE requested
* 2016-01-04 -- Publicly disclosed
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