Improper Control of Generation of Code ('Code Injection') Affecting getgrav/grav package, versions <1.7.45


Severity

Recommended
0.0
high
0
10

CVSS assessment made by Snyk's Security Team. Learn more

Threat Intelligence

Exploit Maturity
Proof of concept
EPSS
0.05% (25th percentile)

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  • Snyk IDSNYK-PHP-GETGRAVGRAV-6476899
  • published22 Mar 2024
  • disclosed21 Mar 2024
  • creditas3617, juckchang

Introduced: 21 Mar 2024

CVE-2024-28117  (opens in a new tab)
CWE-94  (opens in a new tab)

How to fix?

Upgrade getgrav/grav to version 1.7.45 or higher.

Overview

getgrav/grav is a Modern, Crazy Fast, Ridiculously Easy and Amazingly Powerful Flat-File CMS.

Affected versions of this package are vulnerable to Improper Control of Generation of Code ('Code Injection') due to the improper validation of accessible functions through the Utils::isDangerousFunction function and the lack of restrictions on twig functions like twig_array_map, allowing attackers to bypass the validation and execute arbitrary commands. Twig processing of static pages can be enabled in the front matter by any administrative user allowed to create or edit pages. Since the Twig processor runs unsandboxed, this behavior can be exploited to gain arbitrary code execution and elevate privileges on the instance.

PoC

{% set cmd = {'id':'system'} %}
{{ twig_array_map(grav.twig.twig,cmd,'call_user_func')|join }}

References

CVSS Scores

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