[UNIX] AS/400 FTP Server User Accounts Disclosure

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  AS/400 FTP Server User Accounts Disclosure
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SUMMARY

AS/400 servers support FTP in two modes, legacy mode and IFS mode, and 
supports switching between both modes by a special FTP command. When in 
IFS mode, it is possible to create a special symbolic link file and 
retrieve the full list of user accounts.

DETAILS

The iSeries FTP server supports two methods to looks at disk contents. You 
can view and manipulate existing libraries and database files inside the 
libraries in the traditional legacy mode, or as part of the Integrated 
File System (IFS).

The iSeries FTP server can be instructed to change the mode from legacy to 
IFS by special FTP commands.

The ADDLNK AS/400 utility creates a symbolic link file in IFS that may act 
as a pointer to any AS/400 object, including the QSYS library.

This utility can be executed from an FTP session by the special RCMD FTP 
command.

When an FTP client connects to an AS/400 server, changes the mode to IFS 
mode, and lists the contents of a symbolic link pointing at the QSYS 
library, he receives the full list of user accounts, including last log in 
date, and account authorities.


ADDITIONAL INFORMATION

The information has been provided by  <mailto:[email protected]> Shalom 
Carmel.
The original article can be found at:  
<http://www.venera.com/downloads/AS400_user_accounts_ftp_disclosure.pdf> 
http://www.venera.com/downloads/AS400_user_accounts_ftp_disclosure.pdf



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