ReactionIS has reported a weakness and two vulnerabilities in ForeScout CounterACT, which can be exploited by malicious people to conduct spoofing and cross-site scripting attacks.

1) Input passed to the "a" parameter in assets/login is not properly sanitised before being returned to the user. This can be exploited to execute arbitrary HTML and script code in a user's browser session in context of an affected site.

2) Input passed to the "query" parameter in assets/rangesearch (when "fromIndex" is set to "0" and "main_selection" is set to "all") is not properly sanitised before being returned to the user. This can be exploited to execute arbitrary HTML and script code in a user's browser session in context of an affected site.

3) Input passed via the "a" parameter to assets/login is not properly verified before being used to redirect users. This can be exploited to redirect a user to an arbitrary website e.g. when a user clicks a specially crafted link to the affected script hosted on a trusted domain.

The weakness and vulnerabilities are reported in version 6.3.4.x and 7.0.x. Other versions may also be affected.

Solution
Apply available hotfixes.
Further details available to Secunia VIM customers

Provided and/or discovered by
Joseph Sheridan, ReactionIS.

Changelog
Further details available to Secunia VIM customers

Original Advisory
ReactionIS:
http://www.reactionpenetrationtesting.co.uk/forescout-cross-site-redirection.html
http://www.reactionpenetrationtesting.co.uk/forescout-nac-xss.html

Deep Links
Links available to Secunia VIM customers