Check MK < 1.6.0p25, 2.0.x < 2.0.0p4 XSS Vulnerability

Published: 2021-07-28 09:35:32
CVE Author: NIST National Vulnerability Database

CVSS Base Vector:
AV:N/AC:L/Au:S/C:P/I:P/A:N

Detection Type:
Remote Banner

Solution Type:
Vendor Patch

Summary:
Check MK is prone to a cross-site scripting (XSS) vulnerability in the management web console.

Detection Method:
Checks if a vulnerable version is present on the target host.

Technical Details:
The CheckMK management web console 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.

Affected Versions:
Check MK version 1.6.0p24 and prior and 2.0.x through 2.0.0p3.

Recommendations:
Update to version 1.6.0p25, 2.0.0p4 or later.

NIST (National Institute of Standards and Technology) NVD (National Vulnerability Database)

https://nvd.nist.gov/vuln/detail/CVE-2021-36563

References:

https://checkmk.com/de/werk/12762

Severity
Medium
CVSS Score
5.5
Published
2021-07-28
Modified
2021-07-29
Category
Web application abuses

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