Vulnerability identifier: #VU8137
Vulnerability risk: Medium
Exploitation vector: Network
Exploit availability: No
Vendor: PHP Group
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The weakness exists due to improper use of the hash API for key deletion in a situation with an invalid array size. A remote attacker can use untrusted data to trigger heap use-after-free error in ext/standard/var_unserializer.re and execute arbitrary code with elevated privileges.
Successful exploitation of the vulnerability may result in system compromise.
The vulnerability is addressed in the following versions: 7.0.23, 7.1.9 and 7.2.0.
Vulnerable software versions
PHP: 7.0.0 - 7.0.22, 7.1.0 - 7.1.8
Can this vulnerability be exploited remotely?
Is there known malware, which exploits this vulnerability?