#VU16328 Security restrictions bypass in PHP


Published: 2018-12-07

Vulnerability identifier: #VU16328

Vulnerability risk: Low

CVSSv3.1: 6.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C]

CVE-ID: N/A

CWE-ID: CWE-264

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 bypass security restrictions on the target system.

The weakness exists due to BCMath reports some errors and warnings (such as "exponent too large in raise") by directly writing to stderr[1]. A remote attacker can bypass PHP's error handling.

Mitigation
Update to version 7.3.0.

Vulnerable software versions

PHP: 7.0.23


External links
http://bugs.php.net/bug.php?id=75169


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. However, proof of concept for this vulnerability is available.


Latest bulletins with this vulnerability