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Category:   Application (Generic)  >   PHP Vendors:   PHP Group
PHP Hash Table Collision Bug Lets Remote Users Deny Service
SecurityTracker Alert ID:  1026473
SecurityTracker URL:  http://securitytracker.com/id/1026473
CVE Reference:   CVE-2011-4885   (Links to External Site)
Updated:  Feb 3 2012
Original Entry Date:  Dec 29 2011
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): 5.3.8 and prior versions
Description:   A vulnerability was reported in PHP. 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.

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:   The vendor has issued a source code fix (adding the max_input_vars directive) to mitigate attack effects.

[Editor's note: The fix (5.3.9) for this vulnerability introduced a remote code execution vulnerability. See CVE-2012-0830, Alert ID 1026631.]

Vendor URL:  www.php.net/ (Links to External Site)
Cause:   Randomization error
Underlying OS:  Linux (Any), UNIX (Any), Windows (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Jan 11 2012 (Red Hat Issues Fix) PHP Hash Table Collision Bug Lets Remote Users Deny Service
Red Hat has issued a fix for php53 for Red Hat Enterprise Linux 5 and 6.
Jan 19 2012 (Red Hat Issues Fix) PHP Hash Table Collision Bug Lets Remote Users Deny Service
Red Hat has issued a fix for Red Hat Enterprise Linux 5.
Jan 30 2012 (Red Hat Issues Fix) PHP Hash Table Collision Bug Lets Remote Users Deny Service
Red Hat has issued a fix for Red Hat Enterprise Linux 4.
Jul 18 2012 (Oracle Issues Fix for Oracle Secure Backup) PHP Hash Table Collision Bug Lets Remote Users Deny Service
Oracle has issued a fix for Oracle Secure Backup.



 Source Message Contents



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