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||OS/2 Warp 4.5 FTP Server DoS
||15th August 2000
OS/2 Warp 4.5 FTP Server DoS
Advisory Code: VIGILANTE-2000006
August 15, 2000
- 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.
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.
In case you are using a version prior to 4.3, please contact IBM support for
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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