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Category:   Application (Generic)  >   Ruby Vendors:   Matsumoto, Yukihiro
Ruby Parsing Error in 'URI.decode_www_form_component' Lets Remote Users Deny Service
SecurityTracker Alert ID:  1032874
SecurityTracker URL:  http://securitytracker.com/id/1032874
CVE Reference:   CVE-2014-6438   (Links to External Site)
Date:  Jul 13 2015
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 1.9.2 prior to 1.9.2-p330
Description:   A vulnerability was reported in Ruby. A remote user can cause denial of service conditions on the target system.

A remote user can submit a specially crafted URI that, when parsed by the target application using the 'URI.decode_www_form_component' method, will trigger a catastrophic regular expression backtracking and cause the target application to crash or consume excessive resources on the target system.

A demonstration exploit command is provided:

ruby -v -ruri -e'URI.decode_www_form_component "A string that causes catastrophic backtracking as it gets longer %"'

Impact:   A remote user can cause the target application to crash or consume excessive resources on the target system.
Solution:   The vendor has issued a fix (1.9.2-p330) [in August 2014].

[Editor's note: The CVE number was assigned in July 2015.]

The vendor's advisory is available at:

https://www.ruby-lang.org/en/news/2014/08/19/ruby-1-9-2-p330-released/

Vendor URL:  www.ruby-lang.org/en/news/2014/08/19/ruby-1-9-2-p330-released/ (Links to External Site)
Cause:   Input validation error, State error
Underlying OS:  Linux (Any), UNIX (Any), Windows (Any)

Message History:   None.


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