Vulnerability CVE-2011-4885


Published: 2011-12-29   Modified: 2012-02-13

Description:
PHP before 5.3.9 computes hash values for form parameters without restricting the ability to trigger hash collisions predictably, which allows remote attackers to cause a denial of service (CPU consumption) by sending many crafted parameters.

See advisories in our WLB2 database:
Topic
Author
Date
Med.
PHP 5.3.8 Hashtables Proof Of Concept
me
02.01.2012

Type:

CWE-20

(Improper Input Validation)

CVSS2 => (AV:N/AC:L/Au:N/C:N/I:N/A:P)

CVSS Base Score
Impact Subscore
Exploitability Subscore
5/10
2.9/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
None
None
Partial
Affected software
PHP -> PHP 

 References:
http://archives.neohapsis.com/archives/bugtraq/2011-12/0181.html
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c03360041
http://lists.apple.com/archives/security-announce/2012/May/msg00001.html
http://lists.opensuse.org/opensuse-security-announce/2012-03/msg00013.html
http://lists.opensuse.org/opensuse-security-announce/2012-03/msg00016.html
http://marc.info/?l=bugtraq&m=132871655717248&w=2
http://marc.info/?l=bugtraq&m=133469208622507&w=2
http://rhn.redhat.com/errata/RHSA-2012-0071.html
http://support.apple.com/kb/HT5281
http://svn.php.net/viewvc?view=revision&revision=321003
http://svn.php.net/viewvc?view=revision&revision=321040
http://www.debian.org/security/2012/dsa-2399
http://www.exploit-db.com/exploits/18296
http://www.exploit-db.com/exploits/18305
http://www.kb.cert.org/vuls/id/903934
http://www.mandriva.com/security/advisories?name=MDVSA-2011:197
http://www.mandriva.com/security/advisories?name=MDVSA-2013:150
http://www.nruns.com/_downloads/advisory28122011.pdf
http://www.ocert.org/advisories/ocert-2011-003.html
http://www.oracle.com/technetwork/topics/security/cpujul2012-392727.html
http://www.redhat.com/support/errata/RHSA-2012-0019.html
http://www.securityfocus.com/bid/51193
http://www.securitytracker.com/id?1026473
https://exchange.xforce.ibmcloud.com/vulnerabilities/72021
https://github.com/FireFart/HashCollision-DOS-POC/blob/master/HashtablePOC.py

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