#VU65668 Arbitrary file upload in Checkmk - CVE-2021-40905

Vulnerability identifier: #VU65668

Vulnerability 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

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Checkmk
Server applications / Other server solutions

Vendor: tribe29 GmbH

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

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

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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.