A cross site scripting (XSS) vulnerability exists in Check_MK versions 1.4.0x prior to 1.4.0p6, allowing an unauthenticated remote attacker to inject arbitrary HTML or JavaScript via the _username parameter when attempting authentication to webapi.py, which is returned unencoded with content type text/html.

The remote Ubuntu 16.04 ESM host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-5527-2 advisory.

    USN-5527-1 fixed vulnerabilities in Checkmk. This update provides the

    corresponding update for Ubuntu 16.04 ESM.



Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Ubuntu 18.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-5527-1 advisory.

    It was discovered that Checkmk incorrectly handled authentication. An attacker

    could possibly use this issue to cause a race condition leading to information

    disclosure. (CVE-2017-14955)

    It was discovered that Checkmk incorrectly handled certain inputs. An attacker could use these cross-site     scripting issues to inject arbitrary html or

    javascript code to obtain sensitive information including user information,

    session cookies and valid credentials. (CVE-2017-9781, CVE-2021-36563,

    CVE-2021-40906, CVE-2022-24565)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Check_MK running on the remote web server is prior to 1.4.0p6. It is, therefore, affected by a reflected cross-site (XSS) scripting vulnerability in webapi.py due to error messages being interpreted as HTML when they should be plain text. An unauthenticated, remote attacker can exploit this to execute arbitrary script code in a user's browser session.

ID	Name	Product	Family	Severity
183699	Ubuntu 16.04 ESM : Checkmk vulnerabilities (USN-5527-2)	Nessus	Ubuntu Local Security Checks	medium
163287	Ubuntu 18.04 LTS : Checkmk vulnerabilities (USN-5527-1)	Nessus	Ubuntu Local Security Checks	medium
101089	Check_MK < 1.4.0p6 webapi.py XSS	Nessus	CGI abuses : XSS	medium

Detections

Analytics

CVE-2017-9781

medium

Tenable Plugins

medium

medium

medium