#VU110465 Input validation error in PHP - CVE-2006-6383

Vulnerability identifier: #VU110465

Vulnerability risk: Low

CVSSv4.0: 1.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/U:Clear]

CVE-ID: CVE-2006-6383

CWE-ID: CWE-20

Exploitation vector: Local

Exploit availability: Yes

Vulnerable software:
PHP
Universal components / Libraries / Scripting languages

Vendor: PHP Group

Description

The vulnerability allows a local user to read and manipulate data.

PHP 5.2.0 and 4.4 allows local users to bypass safe_mode and open_basedir restrictions via a malicious path and a null byte before a ";" in a session_save_path argument, followed by an allowed path, which causes a parsing inconsistency in which PHP validates the allowed path but sets session.save_path to the malicious path.

Mitigation
Install update from vendor's website.

Vulnerable software versions

PHP: 4.4, 5.2

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External links
https://cvs.php.net/viewcvs.cgi/php-src/ext/session/session.c?r1=1.336.2.53.2.7&r2=1.336.2.53.2.8
https://lists.suse.com/archive/suse-security-announce/2007-Mar/0003.html
https://secunia.com/advisories/24022
https://secunia.com/advisories/24514
https://securityreason.com/achievement_securityalert/43
https://securityreason.com/securityalert/2000
https://www.mandriva.com/security/advisories?name=MDKSA-2007:038
https://www.openpkg.com/security/advisories/OpenPKG-SA-2007.010.html
https://www.securityfocus.com/archive/1/453938/30/9270/threaded
https://www.securityfocus.com/bid/21508

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

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.