Vulnerability identifier: #VU77509

Vulnerability risk: Low

CVSSv3.1: 6.3 [CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-34448

CWE-ID: CWE-20

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 Twig Default Filters. A remote administrator can pass specially crafted input to the application and execute arbitrary code on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Grav CMS: 1.7.0 - 1.7.40

---

External links
http://github.com/twigphp/Twig/blob/v1.44.7/src/Environment.php#L148
http://github.com/getgrav/grav/security/advisories/GHSA-whr7-m3f8-mpm8
http://www.github.com/getgrav/grav/commit/9d6a2dba09fd4e56f5cdfb9a399caea355bfeb83
http://github.com/getgrav/grav/commit/8c2c1cb72611a399f13423fc6d0e1d998c03e5c8
http://huntr.dev/bounties/3ef640e6-9e25-4ecb-8ec1-64311d63fe66/

---

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.