This was sent to vuldbat_private and is a good workaround for the subst problem posted here earlier. I repost it to the list with the author's permission. Thanks David! Ben Greenbaum Site Content Manager Security Focus http://www.securityfocus.com ---------- Forwarded message ---------- Date: Tue, 30 Nov 1999 16:18:38 -0500 From: dmandersat_private To: vuldbat_private Subject: Subst.exe carelessness In our environment, we use both the subst and net use commands to setup the users' environment during logon. In order to avoid any errors, our logon scripts simply include subst *drive_letter* /d statements for all drive letters that we use. This ensures that the machine has no previous mappings before the rest of the script is run. if exist g: subst g: /d if exist h: subst h: /d if exist t: subst t: /d if exist z: subst z: /d subst g: c:\data subst h: c:\apps net use t: \\server\server_apps net use z: \\server\user_home We find that this solution is simple for our environment. And as the exploit that you point out will only work to spoof drive mappings that *should* exist in a normal user environment, this simple script addition will eliminate that problem. David Anders dmandersat_private
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