Vulnerability identifier: #VU33324

Vulnerability risk: Medium

CVSSv3.1: 6.6 [CVSS:3.1/CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C]

CVE-ID: CVE-2012-0830

CWE-ID: CWE-399

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
PHP
Universal components / Libraries / Scripting languages

Vendor: PHP Group

Description

The vulnerability allows a remote non-authenticated attacker to read and manipulate data.

The php_register_variable_ex function in php_variables.c in PHP 5.3.9 allows remote attackers to execute arbitrary code via a request containing a large number of variables, related to improper handling of array variables. NOTE: this vulnerability exists because of an incorrect fix for CVE-2011-4885.

Mitigation
Install update from vendor's website.

Vulnerable software versions

PHP: 5.3.9

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External links
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=134012830914727&w=2
http://openwall.com/lists/oss-security/2012/02/02/12
http://openwall.com/lists/oss-security/2012/02/03/1
http://rhn.redhat.com/errata/RHSA-2012-0092.html
http://secunia.com/advisories/47801
http://secunia.com/advisories/47806
http://secunia.com/advisories/47813
http://secunia.com/advisories/48668
http://securitytracker.com/id?1026631
http://support.apple.com/kb/HT5281
http://svn.php.net/viewvc?view=revision&revision=323007
http://thexploit.com/sec/critical-php-remote-vulnerability-introduced-in-fix-for-php-hashtable-collision-dos/
http://www.debian.org/security/2012/dsa-2403
http://www.h-online.com/security/news/item/Critical-PHP-vulnerability-being-fixed-1427316.html
http://www.osvdb.org/78819
http://www.php.net/ChangeLog-5.php#5.3.10
http://www.securityfocus.com/bid/51830
http://exchange.xforce.ibmcloud.com/vulnerabilities/72911
http://gist.github.com/1725489

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.