#VU9957 Deserialization of untrusted data in PHP - CVE-2017-12934
Published: January 9, 2018 / Updated: January 11, 2018
Vulnerability identifier: #VU9957
Vulnerability risk: High
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2017-12934
CWE-ID: CWE-502
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
PHP
PHP
Software vendor:
PHP Group
PHP Group
Description
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a heap use after free while unserializing untrusted data, related to the zval_get_type function in Zend/zend_types.h in ext/standard/var_unserializer.re. A remote attacker can trigger a use-after-free condition and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Remediation
The vendor has issued the following versions to address this vulnerability: 7.0.21, 7.1.7