Synopsis
The Check_MK Multisite web interface allows administrators to authenticate through webapi.py using the _username and _secret parameters. If authentication through the webapi.py interface fails then an error message is displayed. This error message uses a content type of text/html. The error message takes the following form:
Authentication error: Invalid automation secret for user <username>
Where <username> contains the contents of the _username parameter. This allows an unauthenticated remote attacker to inject arbitrary HTML/Javascript into the failed login message. For example, on an affected target the following URL will create a popup box.
http://[target]/[sitename]/check_mk/webapi.py?_username=<script>alert(%27Tenable%27)</script>&_secret=wrongsecret
Solution
The vendor has released Check_MK version 1.4.0p6 to address this issue.Additional References
http://git.mathias-kettner.de/git/?p=check_mk.git;a=blob;f=.werks/4757;hb=c248f0b6ff7b15ced9f07a3df8a80fad656ea5b1Disclosure Timeline
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