A Cross Site Scripting issue exists in some versions of IIS. The HTTP Error Page created
by IIS may, under some circumstances, contain HTML content which includes unsanitized user
An attacker may construct a link to a vulnerable server such that it exploits this vulnerability.
When an innocent user follows this link, the script code will be reproduced by the server, and
execute within the context of the vulnerable site. This may result in the exposure of sensitive
data and cookie information, or allow the attacker to subvert the content and functionality of the
It has been reported that this issue may be exploited to steal cookie-based authentication credentials
from users of a number of Microsoft domains/services (such as hotmail, passport, etc.).
A number of Cisco products are affected by this vulnerability, although this issue is not
present in the Cisco products themselves.