#VU77508 Incomplete List of Disallowed Inputs in Grav CMS - CVE-2023-34252

Vulnerability identifier: #VU77508

Vulnerability risk: Low

CVSSv4.0: 6.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2023-34252

CWE-ID: CWE-184

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 filterFilter. A remote administrator can execute arbitrary code on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Grav CMS: 1.7.0 - 1.7.40

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External links
https://github.com/getgrav/grav/blob/1.7.40/system/src/Grav/Common/Twig/Extension/GravExtension.php#L1692-L1698
https://github.com/getgrav/grav/security/advisories/GHSA-96xv-rmwj-6p9w
https://github.com/getgrav/grav/blob/1.7.40/system/src/Grav/Common/Utils.php#L1956-L2074
https://github.com/getgrav/grav/commit/244758d4383034fe4cd292d41e477177870b65ec

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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.