CVE-2021-28428 — CRITICAL (9.8)

Vulnerability Description

File upload vulnerability in HorizontCMS before 1.0.0-beta.3 via uploading a .htaccess and *.hello files using the Media Files upload functionality. The original file upload vulnerability (CVE-2020-27387) was remediated by restricting the PHP extensions; however, we confirmed that the filter was bypassed via uploading an arbitrary .htaccess and *.hello files in order to execute PHP code to gain RCE.

CVSS Score

9.8

CRITICAL

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

HIGH

Affected Products

Vendor	Product	Versions
Horizontcms Project	Horizontcms	1.0.0

Related Weaknesses (CWE)

CWE-434

References

https://github.com/ttimot24/HorizontCMSProduct
https://github.com/ttimot24/HorizontCMS/commit/9c4d6827cbe96decec6834d53660e14abPatchThird Party Advisory
https://github.com/ttimot24/HorizontCMSProduct
https://github.com/ttimot24/HorizontCMS/commit/9c4d6827cbe96decec6834d53660e14abPatchThird Party Advisory

FAQ

What is CVE-2021-28428?

CVE-2021-28428 is a vulnerability with a CVSS score of 9.8 (CRITICAL). File upload vulnerability in HorizontCMS before 1.0.0-beta.3 via uploading a .htaccess and *.hello files using the Media Files upload functionality. The original file upload vulnerability (CVE-2020-27...

How severe is CVE-2021-28428?

CVE-2021-28428 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2021-28428?

Check the references section above for vendor advisories and patch information. Affected products include: Horizontcms Project Horizontcms.