Vulnerability identifier: #VU45220

Vulnerability risk: Medium

CVSSv3.1: 6.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2011-1148

CWE-ID: CWE-399

Exploitation vector: Network

Exploit availability: No

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.

Use-after-free vulnerability in the substr_replace function in PHP 5.3.6 and earlier allows context-dependent attackers to cause a denial of service (memory corruption) or possibly have unspecified other impact by using the same variable for multiple arguments.

Mitigation
Install update from vendor's website.

Vulnerable software versions

PHP: 3.0 - 3.0.18, 4.0 - 4.0.7, 4.1.0 - 4.1.2, 4.2.0 - 4.2.3, 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.3.0 - 5.3.5

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External links
http://bugs.php.net/bug.php?id=54238
http://lists.apple.com/archives/security-announce/2012/Feb/msg00000.html
http://marc.info/?l=bugtraq&m=133469208622507&w=2
http://openwall.com/lists/oss-security/2011/03/13/2
http://openwall.com/lists/oss-security/2011/03/13/3
http://openwall.com/lists/oss-security/2011/03/13/9
http://support.apple.com/kb/HT5130
http://www.mandriva.com/security/advisories?name=MDVSA-2011:165
http://www.php.net/archive/2011.php#id2011-08-18-1
http://www.php.net/ChangeLog-5.php#5.3.7
http://www.redhat.com/support/errata/RHSA-2011-1423.html
http://www.securityfocus.com/bid/46843
http://www.securityfocus.com/bid/49241
http://exchange.xforce.ibmcloud.com/vulnerabilities/66080

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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.