Vulnerability identifier: #VU61663

Vulnerability risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-16831

CWE-ID: CWE-98

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Smarty
Web applications / CMS

Vendor: smarty.php.net

Description

The vulnerability allows a remote attacker to include and execute arbitrary PHP files on the server.

The vulnerability exists due to incorrect input validation when including PHP files. A remote non-authenticated attacker can send a specially crafted HTTP request to the affected application, bypass the trusted_dir protection mechanism via a file:./../ substring in an include statemen, include and execute arbitrary PHP code on the system with privileges of the web server.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Smarty: 3.1.0 - 3.1.32

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External links
http://github.com/smarty-php/smarty/issues/486

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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.