Werk #13716: Persistant XSS in Notification configuration

Component Setup
Title Persistant XSS in Notification configuration
Date Jan 27, 2022
Checkmk Edition Checkmk Raw (CRE)
Checkmk Version 1.6.0p28 2.0.0p20
Level Trivial Change
Class Security Fix
Compatibility Compatible - no manual interaction needed

This Werk fixes a Persistant Cross-Site-Scripting (XSS) vulnerability. (CWE-79)

The Alias of a site was not properly escaped when shown as condition for notifications.

To mitigate this vulnerability ensure that only trustwothy users have the Notification configuration and Site management rights. These are admin rights by default.

Checkmk 1.6 and Checkmk 2.0 were subject to this vulnerability.

To detect if this vulnerability is/was used you can check etc/check_mk/multisite.d/sites.mk and etc/check_mk/conf.d/wato/notifications.mk for HTML code. Please be aware that an attacker could delete the code after a attack.

CVE is CVE-2022-24565.

CVSS: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:H/A:N (5.2 medium)

We thank Manuel Sommer for finding this vulnerability and bringing this to our attention.

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