CVE-2021-40906
Publication date 25 March 2022
Last updated 25 August 2025
Ubuntu priority
Description
CheckMK Raw Edition software (versions 1.5.0 to 1.6.0) does not sanitise the input of a web service parameter that is in an unauthenticated zone. This Reflected XSS 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) or to steal the session cookies of a user who has previously authenticated via a man in the middle. Successful exploitation requires access to the web service resource without authentication.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| check-mk | 22.04 LTS jammy | Not in release |
| 20.04 LTS focal | Not in release | |
| 18.04 LTS bionic |
Fixed 1.2.8p16-1ubuntu0.2
|
|
| 16.04 LTS xenial |
Not affected
|
|
| 14.04 LTS trusty | Ignored end of standard support |
Notes
0xnishit
fix 1.6.0p26: https://github.com/tribe29/checkmk/commit/6b89403e47b541f96ac2b2c5953360a039a1fc71
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score |
6.1 · Medium
|
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | Required |
| Scope | Changed |
| Confidentiality | Low |
| Integrity impact | Low |
| Availability impact | None |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
References
Related Ubuntu Security Notices (USN)
- USN-5527-1
- Checkmk vulnerabilities
- 20 July 2022