Input validation error in PHP - CVE-2011-4885

Vulnerability identifier: #VU32831

CSH Severity: Medium

CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

CVE-ID: CVE-2011-4885

CWE-ID: CWE-20

Exploitation vector: Remote access

Exploit availability: Public exploit is available

The vulnerability allows a remote non-authenticated attacker to perform service disruption.

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.

PHP
Amazon Linux AMI
Gentoo Linux
Ubuntu
php (Alpine package)
libapache2-mod-php5 (Ubuntu package)
php5 (Ubuntu package)
php5-cgi (Ubuntu package)
php5-cli (Ubuntu package)
php5-xsl (Ubuntu package)
php5-common (Ubuntu package)

Install update from vendor's website.

PHP - update to 5.3.9
php (Alpine package) - addressed in versions 5.3.8-r1, 5.3.8-r2
libapache2-mod-php5 (Ubuntu package) - addressed in versions 5.2.4-2ubuntu5.22, 5.3.2-1ubuntu4.13, 5.3.3-1ubuntu9.9, 5.3.5-1ubuntu7.6, 5.3.6-13ubuntu3.5
php5 (Ubuntu package) - addressed in versions 5.2.4-2ubuntu5.22, 5.3.2-1ubuntu4.13, 5.3.3-1ubuntu9.9, 5.3.5-1ubuntu7.6, 5.3.6-13ubuntu3.5
php5-cgi (Ubuntu package) - addressed in versions 5.2.4-2ubuntu5.22, 5.3.2-1ubuntu4.13, 5.3.3-1ubuntu9.9, 5.3.5-1ubuntu7.6, 5.3.6-13ubuntu3.5
php5-cli (Ubuntu package) - addressed in versions 5.2.4-2ubuntu5.22, 5.3.2-1ubuntu4.13, 5.3.3-1ubuntu9.9, 5.3.5-1ubuntu7.6, 5.3.6-13ubuntu3.5
php5-xsl (Ubuntu package) - addressed in versions 5.2.4-2ubuntu5.22, 5.3.2-1ubuntu4.13, 5.3.3-1ubuntu9.9, 5.3.5-1ubuntu7.6, 5.3.6-13ubuntu3.5
php5-common (Ubuntu package) - addressed in versions 5.2.4-2ubuntu5.22, 5.3.2-1ubuntu4.13, 5.3.3-1ubuntu9.9, 5.3.5-1ubuntu7.6, 5.3.6-13ubuntu3.5

• Exploit #3666 - PHP Hash Table Collision - Denial of Service (PoC) (July 29, 2020)
• Exploit #3667 - PHP 5.3.8 - Hashtables Denial of Service (July 29, 2020)
• Exploit #3639 - MyBulletinBoard (MyBB) 1.1.5 - 'CLIENT-IP' SQL Injection (July 29, 2020)
• Exploit #3620 - Hashtable Collisions (July 29, 2020)

• 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://secunia.com/advisories/47404
• http://secunia.com/advisories/48668
• 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

• Input validation error in PHP
• Input validation error in php (Alpine package)
• Amazon Linux AMI update for php
• Amazon Linux AMI update for php
• Gentoo update for PHP
• Ubuntu update for php5