Improper Input Validation Affecting getgrav/grav package, versions <1.7.42


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
1.01% (84th percentile)

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  • Snyk IDSNYK-PHP-GETGRAVGRAV-5710391
  • published15 Jun 2023
  • disclosed15 Jun 2023
  • creditRenan Rocha

Introduced: 15 Jun 2023

CVE-2023-34448  (opens in a new tab)
CWE-20  (opens in a new tab)

How to fix?

Upgrade getgrav/grav to version 1.7.42 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 Input Validation. The patch for CVE-2022-2073, a server-side template injection vulnerability in Grav leveraging the default filter() function, did not block other built-in functions exposed by Twig's Core Extension that could be used to invoke arbitrary unsafe functions, thereby allowing for remote code execution.

PoC

{{['cat\x20/etc/passwd']|filter('system')}}

CVSS Scores

version 3.1