Cross-site scripting in Checkmk - CVE-2021-36563
Published: July 20, 2022
Vulnerability identifier: #VU65565
CSH Severity: Medium
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: CVE-2021-36563
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.
The vulnerability exists due to insufficient sanitization of user-supplied data. A remote attacker can permanently inject and execute arbitrary HTML and script code in user's browser in context of vulnerable website.
Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.
Affected software
Checkmk
Ubuntu
check-mk-multisite (Ubuntu package)
check-mk-server (Ubuntu package)
check-mk-livestatus (Ubuntu package)
Ubuntu
check-mk-multisite (Ubuntu package)
check-mk-server (Ubuntu package)
check-mk-livestatus (Ubuntu package)
How to mitigate CVE-2021-36563
Install update from vendor's website.
check-mk-multisite (Ubuntu package) - update to 1.2.8p16-1ubuntu0.2
check-mk-server (Ubuntu package) - update to 1.2.8p16-1ubuntu0.2
check-mk-livestatus (Ubuntu package) - update to 1.2.8p16-1ubuntu0.2
check-mk-server (Ubuntu package) - update to 1.2.8p16-1ubuntu0.2
check-mk-livestatus (Ubuntu package) - update to 1.2.8p16-1ubuntu0.2