Deserialization of untrusted data in PHP - CVE-2017-12934
Published: January 9, 2018 / Updated: January 11, 2018
Vulnerability identifier: #VU9957
CSH Severity: High
CVSS v4.0: 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
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 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.
How to mitigate CVE-2017-12934
The vendor has issued the following versions to address this vulnerability: 7.0.21, 7.1.7