Integer overflow in ZVAL processing in PHP - #VU203

Vulnerability identifier: #VU203

CSH Severity: High

CVSS v4: 9.3 [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]

CVE-ID: N/A

CWE-ID: CWE-119

Exploitation vector: Remote access

Exploit availability: No public exploit available

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

The vulnerability exists due to a boundary error when processing string-typed ZVAL. A remote unauthenticated attacker can cause an integer overflow during ZVAL processing.

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

PHP

Install the latest versions: (5.5.38, 5.6.24, 7.0.9).

• https://bugs.php.net/bug.php?id=72403
• http://www.php.net/ChangeLog-5.php#5.6.24
• http://php.net/ChangeLog-5.php#5.5.38
• http://www.php.net/ChangeLog-7.php#7.0.9

• Multiple vulnerabilities in PHP