Vulnerability identifier: #VU77507

Vulnerability risk: Low

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

CVE-ID: CVE-2023-34251

CWE-ID: CWE-94

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Grav CMS
Web applications / CMS

Vendor: Grav CMS

Description

The vulnerability allows a remote user to execute arbitrary code on the target system.

The vulnerability exists due to Server Side Template Injection (SSTI) issue in the admin screen. A remote administrator can send a specially crafted request and execute arbitrary code on the target system.

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

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Grav CMS: 1.7.41.1

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External links
http://github.com/getgrav/grav/security/advisories/GHSA-f9jf-4cp4-4fq5
http://github.com/getgrav/grav/blob/develop/system/src/Grav/Common/Twig/Extension/GravExtension.php#L174
http://github.com/getgrav/grav/commit/9d01140a63c77075ef09b26ef57cf186138151a5

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated privileged user 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.