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CVE-2021-36563

Published: 26 July 2021

The CheckMK management web console (versions 1.5.0 to 2.0.0) does not sanitise user input in various parameters of the WATO module. This allows an attacker to open a backdoor on the device with HTML content and interpreted by the browser (such as JavaScript or other client-side scripts), the XSS payload will be triggered when the user accesses some specific sections of the application. In the same sense a very dangerous potential way would be when an attacker who has the monitor role (not administrator) manages to get a stored XSS to steal the secretAutomation (for the use of the API in administrator mode) and thus be able to create another administrator user who has high privileges on the CheckMK monitoring web console. Another way is that persistent XSS allows an attacker to modify the displayed content or change the victim's information. Successful exploitation requires access to the web management interface, either with valid credentials or with a hijacked session.

Notes

AuthorNote
0xnishit
fix: https://github.com/tribe29/checkmk/commit/821f99e7ca3dcb41131df25023390a71ef31ad1b

Priority

Low

Cvss 3 Severity Score

5.4

Score breakdown

Status

Package Release Status
check-mk
Launchpad, Ubuntu, Debian
bionic
Released (1.2.8p16-1ubuntu0.2)
focal Does not exist

hirsute Does not exist

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream
Released (2.0.0p10)
xenial
Released (1.2.6p12-1ubuntu0.16.04.1+esm1)
Available with Ubuntu Pro

Severity score breakdown

Parameter Value
Base score 5.4
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction Required
Scope Changed
Confidentiality Low
Integrity impact Low
Availability impact None
Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N