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Category:   Application (Generic)  >   SurfNOW Vendors:   Loom Software Company
SurfNOW Proxy Service Can Be Denied By Remote Users
SecurityTracker Alert ID:  1008879
SecurityTracker URL:  http://securitytracker.com/id/1008879
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Jan 28 2004
Impact:   Denial of service via network
Exploit Included:  Yes  
Version(s): 2.2
Description:   A vulnerability was reported in the SurfNOW proxy software. A remote user can cause the proxy to stop working properly.

Donato Ferrante reported that a remote user can send a specially crafted HTTP GET request to the target server to cause denial of service conditions on the proxy.

As a demonstration exploit, the following request can reportedly be sent several times (approximately seven times) to trigger the flaw:

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

Impact:   A remote user can cause denial of service conditions on the proxy.
Solution:   No solution was available at the time of this entry. According to the report, the vendor plans to issue a fix in the next product release.
Vendor URL:  www.loomsoft.com/ (Links to External Site)
Cause:   Exception handling error, Input validation error
Underlying OS:  Windows (Any)

Message History:   None.


 Source Message Contents

Subject:  Denial Of Service in SurfNOW 2.2


                           Donato Ferrante


Application:  SurfNOW
              http://www.loomsoft.com/

Version:      2.2

Bug:          Denial Of Service

Author:       Donato Ferrante
              e-mail: fdonato@autistici.org
              web:    www.autistici.org/fdonato



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1. Description
2. The bug
3. The code
4. The fix



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----------------
1. Description:
----------------

Vendor's Description:

"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, especially if you are trying to get
several files form overseas or from otherwise rather slow server.
It can also completely hide your IP address by dynamically connecting
to non-transparent anonymizing public proxy servers. You can also test
a list of proxy servers and sort them by connection speed and level
of anonimity."



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------------
2. The bug:
------------

The bug is in the http header handling, so is possible to send crafted
big strings to the server and it will not work correctly.



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-------------
3. The code:
-------------

To test the vulnerability send to the server a string like:

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


For example, if you use netcat you can test the bug, using:

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

and repeating this, for example 7 times.



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------------
4. The fix:
------------

Bug will be fixed in the next version of SurfNOW.
So go on the Loomsoft's official website, http://www.loomsoft.com/
and check for the next version of SurfNOW.



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