Werk #4757: Fixed possible reflected XSS in webapi.py

Component	User interface
Title	Fixed possible reflected XSS in webapi.py
Date	Jun 14, 2017
Level	Prominent Change
Class	Security Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.5.0i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.4.0p6 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.2.8p27 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

In the Check_MK 1.4 branch URLs like this could be used for a reflected XSS attack:

http://<test host>/<site>/check_mk/webapi.py?_username=<script>alert("XSS")</script>&_secret=AnythingHere

The error message was interpreted as HTML while it should be a plain text error message. This has been fixed now.

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