CVE-2024-27921: grav Path Traversal — Exploit & Fix

Description

Grav is an open-source, flat-file content management system. A file upload path traversal vulnerability has been identified in the application prior to version 1.7.45, enabling attackers to replace or create files with extensions like .json, .zip, .css, .gif, etc. This critical security flaw poses severe risks, that can allow attackers to inject arbitrary code on the server, undermine integrity of backup files by overwriting existing files or creating new ones, and exfiltrate sensitive data using CSS exfiltration techniques. Upgrading to patched version 1.7.45 can mitigate the 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-22 Path Traversal

Affected Products

Vendor	Product	Versions
getgrav	grav	< 1.7.45

References

Advisories & Patches

https://github.com/getgrav/grav/commit/5928411b86bab05afca2b33db4e7386a44858e99 https://github.com/getgrav/grav/security/advisories/GHSA-m7hx-hw6h-mqmc https://github.com/getgrav/grav/commit/5928411b86bab05afca2b33db4e7386a44858e99 https://github.com/getgrav/grav/security/advisories/GHSA-m7hx-hw6h-mqmc

Exploits

https://github.com/getgrav/grav/security/advisories/GHSA-m7hx-hw6h-mqmc https://github.com/getgrav/grav/security/advisories/GHSA-m7hx-hw6h-mqmc

Frequently Asked Questions

What is CVE-2024-27921? +

Grav is an open-source, flat-file content management system. A file upload path traversal vulnerability has been identified in the application prior to version 1.7.45, enabling attackers to replace or create files with extensions like .json, .zip, .css, .gif, etc. This critical security flaw poses severe risks, that can allow attackers to inject arbitrary code on the server, undermine integrity of backup files by overwriting existing files or creating new ones, and exfiltrate sensitive data using CSS exfiltration techniques. Upgrading to patched version 1.7.45 can mitigate the issue. It has a CVSS v3.1 base score of 8.8 (HIGH).

How severe is CVE-2024-27921? +

CVE-2024-27921 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-2024-27921? +

CVE-2024-27921 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-2024-27921? +

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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