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Category:   Application (Security)  >   SurfControl Vendors:   SurfControl
SurfControl's SuperScout Web Filter Fails to Block Packets Relayed Via Proxy Servers
SecurityTracker Alert ID:  1001801
SecurityTracker URL:
CVE Reference:   CVE-2001-1465   (Links to External Site)
Updated:  May 12 2008
Original Entry Date:  Jun 21 2001
Impact:   Host/resource access via network
Exploit Included:  Yes  

Description:   It is reported that SurfControl's SuperScout Web Filter will not block connections that have been relayed via certain proxy servers. This could allow a remote user to access restricted web content.

It is reported that a remote user can bypass the filters by using a proxy server. SurfControl reportedly only analyzes packets that have both the HTTP GET request and "Host:" information. If the HTTP GET request is not in the same packet as the "Host:" information, SurfControl will reportedly ignore the connection and allow it to continue unmonitored.

The Source Message lists some proxy servers that can be used to exploit this vulnerability.

Impact:   A remote user can bypass the filters and access restricted web content.
Solution:   No solution was available at the time of this entry.
Vendor URL: (Links to External Site)
Cause:   State error
Underlying OS:  Linux (Any), UNIX (Solaris - SunOS), Windows (NT), Windows (2000)

Message History:   None.

 Source Message Contents

Subject:  SurfControl SuperScout can be Bypassed Using Split Packets

You can bypass the software by using a proxy server before your traffic is 
looked at by SurfControl SuperScout. SurfControl only looks at packets 
that have the HTTP GET request and "Host:" information inside it. If you 
split up the request, so that HTTP GET request is not in the same packet 
as the "Host:" information then SurfControl will ignore the request, and 
allow it to continue unmonitored. 

You can easily split up HTTP requests by using a proxy server before you 
get to the node that is doing the Internet monitoring.

Proxies types you can use:
1) If you have Compaq PC's or servers that are  
<> not patched you 
can proxy off the Insight Manager software.
2) If you have PERL installed you can use  
<> RFProxy,  
<> HTTPush or  
Pudding. (These programs were intended for the testing of IDS evasion 
techniques but work wonders for Internet monitoring/blocking evasion). 


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