Vulnerability identifier: #VU203

Vulnerability risk: High

CVSSv3.1: 8.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: N/A

CWE-ID: CWE-119

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
PHP
Universal components / Libraries / Scripting languages

Vendor: PHP Group

Description
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.

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

Vulnerable software versions

PHP: 7.0.0 - 7.0.8, 5.6.0 - 5.6.23, 5.5.0 - 5.5.37

---

External links
http://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

---

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.