Vulnerability identifier: #VU42670

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-2011-4718

CWE-ID: CWE-264

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.

Session fixation vulnerability in the Sessions subsystem in PHP before 5.5.2 allows remote attackers to hijack web sessions by specifying a session ID.

Mitigation
Install update from vendor's website.

Vulnerable software versions

PHP: 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.27, 5.4.0 - 5.4.16, 5.5.0

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External links
http://git.php.net/?p=php-src.git;a=commit;h=169b78eb79b0e080b67f9798708eb3771c6d0b2f
http://git.php.net/?p=php-src.git;a=commit;h=25e8fcc88fa20dc9d4c47184471003f436927cde
http://bugs.php.net/bug.php?id=60491
http://wiki.php.net/rfc/strict_sessions

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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.