PHP Hash Table Collision Bug Lets Remote Users Deny Service
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SecurityTracker Alert ID: 1026473 |
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SecurityTracker URL: http://securitytracker.com/id/1026473
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CVE Reference:
CVE-2011-4885
(Links to External Site)
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Updated: Feb 3 2012
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Original Entry Date: Dec 29 2011
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Impact:
Denial of service via network
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Fix Available: Yes Vendor Confirmed: Yes Exploit Included: Yes
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Version(s): 5.3.8 and prior versions
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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.
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Impact:
A remote user can cause performance to degrade on the target server.
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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.]
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Vendor URL: www.php.net/ (Links to External Site)
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Cause:
Randomization error
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Underlying OS: Linux (Any), UNIX (Any), Windows (Any)
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Message History:
This archive entry has one or more follow-up message(s) listed below.
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Source Message Contents
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[Original Message Not Available for Viewing]
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