#VU7352 Stack-based buffer overflow in PHP - CVE-2017-11362

Vulnerability identifier: #VU7352

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-2017-11362

CWE-ID: CWE-121

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.

The weakness exists due to stack buffer overflow in line 142 when parsing locale in msgfmt_parse_message(). A remote attacker can trigger an error when passing overtly long slocale into libicu's umsg_open() that may lead to out-of-bounds write and execute arbitrary code with web server privileges.

Successful exploitation of the vulnerability may result in system compromise.

Mitigation
Update to version 7.0.21.

Vulnerable software versions

PHP: 7.0.0 - 7.0.20

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External links
https://php.net/ChangeLog-7.php#7.0.21
https://bugs.php.net/bug.php?id=73473

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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.