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Avirt40.txt

Avirt40.txt
Posted Feb 23, 2004
Authored by Donato Ferrante | Site autistici.org

Avirt Voice version 4.0 is susceptible to a remote buffer overflow via a large GET request passed on port 1080.

tags | advisory, remote, overflow
SHA-256 | 5243e3bc2e2a8e9bc2c784387ebbc2fe0735347130db3f4e932b123f0c378a19

Avirt40.txt

Change Mirror Download
                           Donato Ferrante


Application: Avirt Voice
http://www.avirt.com/

Version: 4.0

Bug: Remote Buffer Overflow

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:

"Avirt Voice acts as an H.323 gateway between IP networks. It allows
users to operate H.323 applications, like Microsoft NetMeeting, Intel
Video Phone, or Netspeak Webphone, from behind a firewall.
Because Voice is a software solution, it is more easily scalable and
much less expensive than hardware alternatives."



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

The program doesn't well manage the received strings on the TCP port
1080. In fact it will have a buffer overflow.



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

To test the vulnerability simply send to the server ( port 1080 ) a
string like:

GET aaaa[ 1113 of a ]aaaa



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

Vendor was contacted.
Bug will be fixed in the next version of Avirt Voice.



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