#VU223 A use-after-free error in MBString in PHP - CVE-2016-3132

Vulnerability identifier: #VU223

Vulnerability risk: High

CVSSv4.0: 8.1 [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-2016-3132

CWE-ID: CWE-416

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 use-after-free memory error in MBString. A remote unauthenticated attacker can execute arbitrary code execution on the target system.

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

Mitigation
Install the latest version: (7.0.9).

Vulnerable software versions

PHP: 7.0.0 - 7.0.8

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External links
https://bugs.php.net/bug.php?id=72399
https://php.net/ChangeLog-5.php#5.5.38
https://php.net/ChangeLog-5.php#5.6.24
https://php.net/ChangeLog-7.php#7.0.9

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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.