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                  Defcom Labs Advisory def-2001-17

                   Navision Financials Server DoS

Author: Peter Gründl <peter.grundldefcom.com>
Release Date: 2001-04-03
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------------------------=[Brief Description]=-------------------------
The Navision Financials Server contains a flaw that allows an attacker
to crash the service.

------------------------=[Affected Systems]=--------------------------
- Navision Financials Server V2.50 for Windows NT/2000
- Navision Financials Server V2.60 for Windows NT/2000

----------------------=[Detailed Description]=------------------------
Sending a null character followed by approx. 30k of A's to TCP port
2407 causes a buffer overflow and terminates the process (SERVER.EXE).
The overflow does not appear to be exploitable.

A smaller amount can also be used, and will silently kill the process.
This requires approx. 10 connections starting with a null character,
followed by 100+ characters.

---------------------------=[Workaround]=-----------------------------
Disallow access to TCP port 2407 from untrusted systems, and contact
Navision-Damgaard Support to obtain the patch for this problem:

http://www.navision.com/com/view.asp?documentID=258

-------------------------=[Vendor Response]=--------------------------
The issue was brought to the vendors attention on the 21st of
December, 2000. A patch was created by the vendor on the 5th of March,
2001.

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