Security restrictions bypass in Umbraco CMS

1) Improper access control

EUVDB-ID: #VU51874

Risk: Low

CVSSv4.0: 1.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-29454

CWE-ID: CWE-284 - Improper Access Control

Exploit availability: No

Description

The vulnerability allows a remote user to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to improper access restriction within the LogViewer functionality. A remote authenticated user can bypass implemented security restrictions and gain unauthorized access to the application.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Umbraco CMS: 8.0.0 - 8.9.1

CPE2.3

• cpe:2.3:a:umbraco:umbraco:8.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:umbraco:umbraco:8.0.01:*:*:*:*:*:*:*
• cpe:2.3:a:umbraco:umbraco:8.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:umbraco:umbraco:8.0.2:*:*:*:*:*:*:*
• cpe:2.3:a:umbraco:umbraco:*:*:*:*:*:*:*:*
• cpe:2.3:a:umbraco:umbraco:8.1.0:*:*:*:*:*:*:*
• cpe:2.3:a:umbraco:umbraco:8.3.0:*:*:*:*:*:*:*

External links

https://github.com/umbraco/Umbraco-CMS/pull/9361
https://www.trustwave.com/en-us/resources/security-resources/security-advisories/?fid=28645

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.