t0fx has reported two vulnerabilities in H-Sphere, which can be exploited by malicious people to conduct cross-site scripting attacks.
Input passed to the "err" and "login" parameters in webshell4's login.php script 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.
The vulnerabilities are reported in versions 3.0.0 P9 and 3.1 P1. Other versions may also be affected.
Solution: Filter malicious characters and character sequences in a web proxy.
Provided and/or discovered by: t0fx. Additional information from Peter M. Abraham.
Original Advisory: http://www.xssing.com/index.php?x=3&y=65
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