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Category:   Application (Generic)  >   Ruby Vendors:   Matsumoto, Yukihiro
(Red Hat Issues Fix) Ruby Hash Table Collision Bug Lets Remote Users Deny Service
SecurityTracker Alert ID:  1026596
SecurityTracker URL:  http://securitytracker.com/id/1026596
CVE Reference:   CVE-2011-4815   (Links to External Site)
Date:  Jan 30 2012
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): 1.8.7-p356 and prior versions
Description:   A vulnerability was reported in Ruby. A remote user can cause denial of service conditions.

A remote user can send specially crafted POST request values to trigger hash collisions and cause significant performance degradation on the target server.

Version 1.9.x is not affected.

The original advisory is available at:

http://www.nruns.com/_downloads/advisory28122011.pdf

Alexander Klink of n.runs AG and Julian Walde of Technische Universitat Darmstadt reported this vulnerability. Scott A. Crosby and Dan S. Wallach of Rice University reported the theoretical attack.

Impact:   A remote user can cause performance to degrade on the target server.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2012-0069.html

Vendor URL:  www.ruby-lang.org/en/news/2011/12/28/denial-of-service-attack-was-found-for-rubys-hash-algorithm/ (Links to External Site)
Cause:   Randomization error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  6

Message History:   This archive entry is a follow-up to the message listed below.
Dec 29 2011 Ruby Hash Table Collision Bug Lets Remote Users Deny Service



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