RE: Windows Command Processor CMD.EXE Buffer Overflow

Hi,

I had tested on couple of winxp sp2 fully patched systems, DEP came into
the picture.
On Win2k - the cmd.exe immediately terminates; on vista - no issues - it
throws up a proper error.

just for clarifying if you executed the command properly -- "\\?\" is
required after dir cmd.. and not
one with the single slash "\?\". to reproduce the issue in winxp sp2,
copy page the command from my original
mail into a notepad instance; remove the unnecessary line-breaks to make
it a single line command. now, copy-paste
this line into an instance of the command processor and execute it.


On Fri, 20 Oct 2006 15:51:17 -0700, "Marvin Simkin"
<[email protected]> said:
> WXPSP2 fully patched:
> 
> C:\>ver
> 
> Microsoft Windows XP [Version 5.1.2600]
> 
> C:\>%COMSPEC% /K "dir
> \?\AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
> AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
> AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
> The filename or extension is too long.
> 
> C:\>
> 
> ... but then, all the command history is lost; you cannot arrow-up to
> repeat the command.
> 
> 
> 
> 
> -----Original Message-----
> From: [email protected] on behalf of Osvaldo Casagrande
> Sent: Fri 2006-10-20 04:51
> To: gregory_panakkal; [email protected]
> Subject: RE: Windows Command Processor CMD.EXE Buffer Overflow
>  
> It does not works on Windows Vista RC1 (5728)
> 
> 
> Osvaldo Casagrande 
> MCSE. MCT, MVP, Security+
> Gerente de Servicios 
> DiviServ S.A.
> D: 595(21) 613 828 | Cel. 595 (971) 300 836 | |: [email protected]
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> Busca mis referencias? / Looking for my personal references?
> Acces to Programa MVP - Access to Certificaciones MS On "Transcript ID"
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> 
> Running Windows Vista RC1- Build 5728 and Office 2007 Beta 2 TR
> 
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> -----Original Message-----
> From: [email protected] [mailto:[email protected]]
> On Behalf Of gregory_panakkal
> Sent: Wednesday, October 18, 2006 11:33 PM
> To: [email protected]
> Subject: Windows Command Processor CMD.EXE Buffer Overflow
> 
> 
> Windows Command Processor CMD.EXE Buffer Overflow
> Tested on WinXP SP2
> Impact - Very Low
> 
> 
> Copy-paste the following line in cmd.exe and execute it..
> (it is a single command, has been split into multiple lines for
> readability sake).
> 
> %COMSPEC% /K "dir
> \\?\AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
> AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
> AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
> AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
> 
> (260 characters of 'A's)
> 
> DEP Comes into the picture.
> 
> URL :
> http://www.infogreg.com/security/misc/windows-command-processor-cmd.exe-buffer-overflow.html
> 
> regards,
> Gregory Panakkal
> www.infogreg.com
> -- 
>   gregory_panakkal
>   [email protected]
> 
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> 
-- 
  gregory_panakkal
  [email protected]

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