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Subject: OS/2 Warp 4.5 FTP Server DoS
From: Peter Gründl (prgVIGILANTE.COM)
Date: Tue Aug 15 2000 - 06:32:00 CDT

OS/2 Warp 4.5 FTP Server DoS

Advisory Code: VIGILANTE-2000006

Release Date:
August 15, 2000

Systems Affected:
- OS/2 Warp 4.5 FTP server V4.0/4.2
- OS/2 Warp 4.5 FTP server V4.3
- Probably other versions of the software as well.

The FTP server that comes with OS/2 Warp 4.5 TCP/IP can be brought down by a
malicious connection attempt.

Vendor Status:
The vendor has released the patch for the problem and it contains
the following explanation of the problem: "Sending username/password
followed immediately by up to 1k of data when connecting to FTP via Telnet,
can cause a trap. ".
During testing we found that an initial connection attempt (using sockets,
telnet, ftp etc.) using an invalid username/password combination, followed
by a second attempt, where the userfield was exceptionally long (256 bytes)
would crash the service.

In case you are using a version prior to 4.3, please contact IBM support for
further assistance.
If you are using v4.3, you can get the patch at the following URL:

Vendor URL: http://www.ibm.com
Product URL: http://www.ibm.com/software/os/warp/

Copyright VIGILANTe 2000-08-15

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