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Proxy vulnerability in TrendMicro InterScan-VirusWall V3.6



Thanks Volker,

      This warning was published 6 months ago. Please see the TrendMicro
Solution Bank (Solution 13000):


http://kb.trendmicro.com/solutions/solutionDetail.asp?solutionID=13000

      Regards,

            Josué.

----- Remitido por Josue Rodriguez Garduño/CATALUNYA/RETEVISION con fecha
23/12/2002 18:08 -----
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|         |              Volker Tanger|
|         |  <volker.tanger@xxxxxxxxx>|
|         |           05/12/2002 17:00|
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  |                                                        ...Comunicado                                                         |
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  |       Para:     bugtraq@xxxxxxxxxxxxxxxxx                                                                                    |
  |       cc: volker.tanger@xxxxxxxxx                                                                                            |
  |       cco:                                                                                                                   |
  |       Asunto:   Proxy vulnerability in TrendMicro InterScan-VirusWall V3.6                                                   |
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Greetings!

A quite well known (i.e. ancient) type of proxy vulnerability was
found for TrendMicro's InterScan VirusWall V3.6  This general problem
has been known to be an issue with plain HTTP proxies like the Squid
for ages (e.g. http://www.squid-cache.org/Doc/FAQ/FAQ-10.html#ss10.14).

The vulnerability can be exploited using the CONNECT method to
connect to a different server, e.g. an internal mailserver as
port usage is completely unrestricted by the ISVW proxies V 3.6

Example:
             you = 6.6.6.666
             Trendmicro ISVW = 1.1.1.1  (http proxy at port 80)
             Internal Mailserver = 2.2.2.2

             connect with "telnet 1.1.1.1 80" to ISVW proxy and enter
             CONNECT 2.2.2.2:25 / HTTP/1.0

             response: mail server banner - and running SMTP session e.g.
             to send SPAM from.

You can connect to any TCP port on any machine the proxy
can connect to. Telnet, SMTP, POP, etc.


Solution:
             Update to ISVW 3.7 Build 1190 or newer (available since some
             weeks now).


temp. Workarounds:
             - disable the HTTP proxy (safe but inconvenient)
             - You have a firewall that prevents unauthorized access to the
               Trend ISVW proxy, don't you?



Volker Tanger
IT-Security Consulting

- --
discon gmbh
Wrangelstraße 100
D-10997 Berlin

fon    +49 30 6104-3307
fax    +49 30 6104-3461

volker.tanger@xxxxxxxxx
http://www.discon.de/


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