Arbitrary file upload in CheckMK

1) Arbitrary file upload

EUVDB-ID: #VU65668

Risk: Low

CVSSv4.0: 6.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-40905

CWE-ID: CWE-434 - Unrestricted Upload of File with Dangerous Type

Exploit availability: No

Description

The vulnerability allows a remote user to compromise vulnerable system.

The vulnerability exists due to insufficient validation of ".mkp" files during file upload. A remote user can upload a malicious file and execute it on the server.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Checkmk: 2.0.0 b1 - 2.0.0

CPE2.3

• cpe:2.3:a:tribe29:checkmk:2.0.0:b1:*:*:*:*:*:*
• cpe:2.3:a:tribe29:checkmk:2.0.0:i1:*:*:*:*:*:*
• cpe:2.3:a:tribe29:checkmk:2.0.0:p1:*:*:*:*:*:*

External links

https://github.com/Edgarloyola/CVE-2021-40905

Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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