Vulnerability identifier: #VU16067

Vulnerability risk: Low

CVSSv3.1: 8.2 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C]

CVE-ID: CVE-2018-19518

CWE-ID: CWE-77

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
PHP
Universal components / Libraries / Scripting languages

Vendor: PHP Group

Description
The vulnerability allows a remote authenticated attacker to execute arbitrary commands on the target system.

The weakness exists due to insufficient validation of user-supplied input. A remote attacker can send specially crafted data to inject and execute arbitrary commands.

Mitigation
Install update from vendor's website.

Vulnerable software versions

PHP: 5.6.0 - 5.6.38, 7.1.0 - 7.1.24, 7.2.0 - 7.2.12

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External links
http://bugs.php.net/bug.php?id=77153
http://github.com/Bo0oM/PHP_imap_open_exploit/blob/master/exploit.php

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, a fully functional exploit for this vulnerability is available.