SB2016091203 - Deserialization of Untrusted Data in PHP

Description

This security bulletin contains information about 1 vulnerability.

1) Deserialization of Untrusted Data (CVE-ID: CVE-2016-7124)

CWE-ID: CWE-502 - Deserialization of Untrusted Data

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Green

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to insecure input validation when processing certain objects in "ext/standard/var_unserializer.c" PHP extension. A remote attacker can pass specially crafted data to the application and execute arbitrary code on the target system via "__destruct" or "magic" method calls.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Remediation

Install update from vendor's website.

References

• http://openwall.com/lists/oss-security/2016/09/02/9
• http://www.php.net/ChangeLog-5.php
• http://www.php.net/ChangeLog-7.php
• http://www.securityfocus.com/bid/92756
• http://www.securitytracker.com/id/1036680
• https://bugs.php.net/bug.php?id=72663
• https://github.com/php/php-src/commit/20ce2fe8e3c211a42fee05a461a5881be9a8790e?w=1
• https://security.gentoo.org/glsa/201611-22
• https://www.tenable.com/security/tns-2016-19