Deserialization of Untrusted Data in PHP - CVE-2016-7124
Published: November 28, 2018
Vulnerability identifier: #VU16138
CSH Severity: Medium
CVSS v4.0: 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
CVE-ID: CVE-2016-7124
CWE-ID: CWE-502
Exploitation vector: Remote access
Exploit availability:
Public exploit is available
Vendor: PHP Group
Affected software:
PHP
PHP
Detailed vulnerability description
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.
How to mitigate CVE-2016-7124
Install updates from vendor's website.
Sources
- 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