Checkmk Werk 15691: Fix XSS in business intelligence

ID: 15691 Title: Fix XSS in business intelligence Component: Setup Level: 1 Class: Security fix Version: 2.3.0b1 Prior to this Werk it was possible to inject HTML or Javascript (Reflected XSS). A legitimate user tricked to click on a prepared link would then run arbitrary Javascript code in a valid session. This vulnerability is only triggerable if another <i>Business Intelligence</i> <i>BI pack</i> (next to the default) was created. We found this vulnerability internally. <b>Affected Versions</b>: LI: 2.2.0 LI: 2.1.0 LI: 2.0.0 LI: 1.6.0 (probably older versions as well) <b>Indicators of Compromise</b>: To check for exploitation one can check the site apache access log <tt>var/log/apache/access_log</tt> for entries like <tt>/$SITENAME/check_mk/wato.py?mode=bi_aggregations&bulk_moveto=</tt>. The order of the URL paramters can be changed by an attacker. Potential injected code would be in the parameter <tt>bulk_moveto</tt>. <b>Vulnerability Management</b>: We have rated the issue with a CVSS Score of 5.4 (Medium) with the following CVSS vector: <tt>CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N</tt>. We assigned CVE-2023-23548 to this vulnerability. <b>Changes</b>: This Werk introduces escaping for the vulnerable parameter.