Werk #14087: Fix privilege escalation vulnerability

Component Checks & agents
Title Fix privilege escalation vulnerability
Date May 12, 2022
Checkmk Edition Checkmk Raw (CRE)
Checkmk Version 2.2.0b1 2.1.0b9 2.0.0p25 1.6.0p29
Level Prominent Change
Class Security Fix
Compatibility Compatible - no manual interaction needed

Previously to this Werk an attacker who could become a site user could replace the sites bin/unixcat by a custom executable. The Checkmk agent would then run it as root.

With this Werk the agent now always calls one of the shipped unixcats below /omd/versions/.

All maintained versions (>=1.6) are subject to this vulnerability. It is likely that also previous versions were vulnerable.

To check against possible exploitation make sure that the sites directory ~MySite/bin points to /omd/versions/MySitesVersion/bin.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H 8.8

We assigned CVE-2022-43440 to this vulnerability.

We thank Jan-Philipp Litza (PLUTEX GmbH) for bringing this to our attention.

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