VIGILANTE-2000006.txt

`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:  
ftp://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  
  
Disclaimer:  
The information within this document may change without notice. Use of  
this information constitutes acceptance for use in an AS IS  
condition. There are NO warranties with regard to this information.  
In no event shall the author be liable for any consequences whatsoever  
arising out of or in connection with the use or spread of this  
information. Any use of this information lays within the user's  
responsibility.  
  
Feedback:  
Please send suggestions, updates, and comments to:  
  
VIGILANTe  
mailto: [email protected]  
http://www.vigilante.com  
  
  
  
`