CVE-2024-27923: grav Auth Bypass — Exploit & Fix

Description

Grav is a content management system (CMS). Prior to version 1.7.43, users who may write a page may use the `frontmatter` feature due to insufficient permission validation and inadequate file name validation. This may lead to remote code execution. Version 1.7.43 fixes this issue.

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CVSS v3.1 Score

8.8

HIGH

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

Weakness Type (CWE)

CWE-287 Improper Authentication

CWE-434 Unrestricted Upload

Affected Products

Vendor	Product	Versions
getgrav	grav	< 1.7.43

References

Advisories & Patches

https://github.com/getgrav/grav/commit/e3b0aa0c502aad251c1b79d1ee973dcd93711f07 https://github.com/getgrav/grav/security/advisories/GHSA-f6g2-h7qv-3m5v https://github.com/getgrav/grav/commit/e3b0aa0c502aad251c1b79d1ee973dcd93711f07 https://github.com/getgrav/grav/security/advisories/GHSA-f6g2-h7qv-3m5v

Exploits

https://github.com/getgrav/grav/security/advisories/GHSA-f6g2-h7qv-3m5v https://github.com/getgrav/grav/security/advisories/GHSA-f6g2-h7qv-3m5v

Frequently Asked Questions

What is CVE-2024-27923? +

Grav is a content management system (CMS). Prior to version 1.7.43, users who may write a page may use the `frontmatter` feature due to insufficient permission validation and inadequate file name validation. This may lead to remote code execution. Version 1.7.43 fixes this issue. It has a CVSS v3.1 base score of 8.8 (HIGH).

How severe is CVE-2024-27923? +

CVE-2024-27923 has a CVSS v3.1 score of 8.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2024-27923? +

CVE-2024-27923 affects products from getgrav, specifically: grav. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-27923? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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