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Code Injection Affecting getgrav/grav package, versions <1.7.45

0.0
high

Snyk CVSS

    Attack Complexity Low
    Privileges Required High
    Confidentiality High
    Integrity High
    Availability High

    Threat Intelligence

    Exploit Maturity Proof of concept
    EPSS 0.04% (9th percentile)

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  • Snyk ID SNYK-PHP-GETGRAVGRAV-6476901
  • published 22 Mar 2024
  • disclosed 21 Mar 2024
  • credit as3617, juckchang
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Introduced: 21 Mar 2024

CVE-2024-28118 Open this link in a new tab
CWE-94 Open this link 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 Code Injection due to the unrestricted access to twig extension class from Grav context, allowing an attacker to redefine config variable. As a result, an attacker can bypass a previous mitigation. 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.

PoC 

{{ grav.twig.twig.registerUndefinedFunctionCallback('system') }}
{% set a = grav.config.set('system.twig.undefined_functions',false) %}
{{ grav.twig.twig.getFunction('id') }}

References