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 PROBLEM

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) using an invalid username/password combination, followed by a

second attempt, where the userfield was exceptionally long (256 bytes) would

crash the service.



Fix:

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:

http://ftp.software.ibm.com/ps/products/tcpip/fixes/v4.3os2/ic27721/



Vendor   URL: http://www.ibm.com

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



Copyright VIGILANTe 2000-08-15



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