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Closing Hole

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Name: d85kennedy
Date: April 10, 2007 at 13:59:47 Pacific
OS: WinXP (Pro)
CPU/Ram: Intel Centrino 1.3Ghz / 2
Product: PB
Comment:

I need some expert help in closing a security hole I have come across with Windows XP.

Couple of months back, I saw a guy 'work' his way around the security of Windows XP Pro. Whilst at a workstation logged in under a limited user account the guy called up the command prompt, entered a command to start an .exe file on a timer.

What he then did was setup explorer.exe to start within, say, 1 minute. He then did a ctrl+alt+del and under the processes tab ended explorer.exe

What this did was in effect kick him out of his current session as he had in effect shutdown Windows, only a blue screen was displayed - no login screen or anything. but 1 minute later, the command kicked in and Windows restarted.

When Windows re-started he was then "logged" in as an admin. There were no permissions or restrictions on anything.

Does anybody know where i can find the syntax for the command prompt so i can see exactly what is happening and then try to disable this workaround.

Obviously, since somebody has to login under a limited username/password first, before switching, it would be easy to determine the last user if any damage was done - however, I have no idea if it could be proven that said user performed the above 'cheat' and therefor caused the damage.

Thanks for your help with this.

D.



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Response Number 1
Name: terii
Date: April 10, 2007 at 15:43:58 Pacific
Reply:

Good luck.


0

Response Number 2
Name: wanderer
Date: April 12, 2007 at 10:04:19 Pacific
Reply:

Cool trick but I think you missed observing something.

To schedule something you would use the AT command like AT \\machinename time /interactive "explorer.exe"

But a "user" can't run the command. They get access denied.

What you describe works under power user or admin status. Though I have as yet to verify what the rights status is since I was in as an admin when I did the procedure you describe and didn't see any differnece after the procedure.

Give a person a fish, they eat for a day. Suggest they internet search and they learn a skill for a lifetime.


0

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