CVE-2024-28117 – getgrav/grav

Package

Manager: composer
Name: getgrav/grav
Vulnerable Version: >=0 <1.7.45

Severity

Level: High

CVSS v3.1: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

EPSS: 0.0063 pctl0.69389

Details

Server Side Template Injection (SSTI) ### Summary Grav validates accessible functions through the Utils::isDangerousFunction function, but does not impose restrictions on twig functions like twig_array_map, allowing attackers to bypass the validation and execute arbitrary commands. ### Details ``` {{ grav.twig.twig.getFunction('twig_array_map')|var_dump }} ```  When we accessed twig_array_map like this, we confirmed that the twigFunction object is properly returned. Since the callable property is correctly included, we can access twig_array_map without any restrictions. ``` {% set cmd = {'id':'system'} %} {{ twig_array_map(grav.twig.twig,cmd,'call_user_func')|join }} ``` Since there is no validation on twig_array_map itself, it is possible to call arbitrary function using call_user_func. ### PoC ``` {% set cmd = {'id':'system'} %} {{ twig_array_map(grav.twig.twig,cmd,'call_user_func')|join }} ``` ### Impact Twig processing of static pages can be enabled in the front matter by any administrative user allowed to create or edit pages. As the Twig processor runs unsandboxed, this behavior can be used to gain arbitrary code execution and elevate privileges on the instance.

Metadata

Created: 2024-03-22T16:35:48Z
Modified: 2025-01-03T16:06:28Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2024/03/GHSA-qfv4-q44r-g7rv/GHSA-qfv4-q44r-g7rv.json
CWE IDs: ["CWE-94"]
Alternative ID: GHSA-qfv4-q44r-g7rv
Finding: F422
Auto approve: 1