full-disclosure - another filename bypass vulnerability

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Message-ID: <OFF9D78525.6F4BDA2B-ON882570BC.006D43ED-882570BC.006DBA11@symantec.com>
Date: Thu Nov 17 19:59:00 2005
From: pferrie at symantec.com (Peter Ferrie)
Subject: another filename bypass vulnerability -
	from	cmd.exe

> Was doing some testing [xfocus-AD-051115]
> The system is windows 2000 sp4 srp5 with
> all other patches upto date.
> At the command prompt cmd.exe execute
> the following with the results.
>
> E:\TEMP>cd test
> E:\TEMP\test>copy %windir%\system32\calc.exe
>         1 file(s) copied.
> E:\TEMP\test>ren calc.exe calc.exe.zip
> E:\TEMP\test>dir /b
> calc.exe.zip
> E:\TEMP\test>calc.exe.zip
> E:\TEMP\test>
> -------------------------------------------------------------------
> This bring up the calc.exe on the screen.

But this is old and well-known.
Any file can be executed from the command-line by supplying the full
name+extension.
It has been so since Windows NT was released.
Windows opens the file, and if Windows sees that it's a Windows executable,
Windows runs it.
However, it's not limited to executable files.
Create a text file, name it "blah.txt", then type "blah.txt" and Notepad
will open it.
In that case, Windows sees that it's not a Windows file, and checks the
registry for a handler.

8^) p.