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Category:   Application (Web Server/CGI)  >   Microsoft Internet Information Server (IIS) Web Server Vendors:   Microsoft
Microsoft Internet Information Server May Allow Remote Users to Conduct HTTP Response Smuggling Attacks
SecurityTracker Alert ID:  1014364
SecurityTracker URL:  http://securitytracker.com/id/1014364
CVE Reference:   CVE-2005-2089   (Links to External Site)
Updated:  Jul 3 2005
Original Entry Date:  Jul 3 2005
Impact:   Modification of user information
Exploit Included:  Yes  
Version(s): 5.0, 6.0
Description:   A potential vulnerability was reported in Microsoft Internet Information Server (IIS) when used in conjunction with certain gateway and proxy servers. A remote user can conduct HTTP request smuggling attacks.

If the web server is used in conjunction with a proxy server or application gateway (e.g., cache, firewall) and if there is an input validation vulnerability in the web server or one of its applications, then a remote user can use HTTP request smuggling techniques to hijack a target user's request or conduct a variation of a cross-site scripting attack against a target user.

A remote user can send multiple, HTTP requests with specially crafted HTTP headers to the target server via the proxy/gateway server. The requests may be interpreted differently by the target server than by the proxy/gateway server. As a result, unexpected results may occur. A remote user may be able to poison an intermediate cache, bypass application-level security features within an intermediate proxy/gateway server, or conduct cross-site scripting attacks against target users.

Networks that use IIS in conjunction with Squid, Apache, Internet Security and Acceleration Server, DeleGate, or FireWall-1 may be affected. Other configurations may also be affected.

This vulnerability was reported by Watchfire.

A description of HTTP request smuggling attacks is available at:

http://www.watchfire.com/resources/HTTP-Request-Smuggling.pdf

Impact:   Depending on the associated proxy/gateway server used in conjunction with the target system, a remote user may be able to poison an intermediate cache, bypass application-level security features within an intermediate proxy/gateway server, or conduct cross-site scripting attacks against target users.
Solution:   No solution was available at the time of this entry.
Vendor URL:  www.microsoft.com/ (Links to External Site)
Cause:   State error
Underlying OS:  Windows (Any)

Message History:   None.


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