Werk #13716: Persistant XSS in Notification configuration

Component

Setup

Title

Persistant XSS in Notification configuration

Date

Jan 27, 2022

Level

Trivial Change

Class

Security Fix

Compatibility

Compatible - no manual interaction needed

Checkmk versions & editions

2.0.0p20	Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)
1.6.0p28	Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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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