bugtraq - RE: when will AV vendors fix this???

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Date: Mon, 7 Aug 2006 20:20:03 +0200
From: "Thomas D." <whistl0r@...glemail.com>
To: "'Bipin Gautam'" <gautam.bipin@...il.com>,
	<full-disclosure@...ts.grok.org.uk>, <bugtraq@...urityfocus.com>
Subject: RE: when will AV vendors fix this???


> -----Original Message-----
> From: Bipin Gautam
> Sent: Saturday, August 05, 2006 9:21 AM
> Subject: when will AV vendors fix this???
> 
> to keep things simple, let me give you a situation;
> 
> if there is a directory/file a EVIL_USER is willing to hide from
> antivirus scanner all he has to do is fire up a command prompt & run
> the command;
> 
> cacls.exe TORJANED_FILE_OR_DIRECTORY_NAME /T /C /P EVIL_USER:R
> 
> 
> next time EVEN when the administrator starts the antivirus "system
> scan" the TORJANED_FILE_OR_DIRECTORY_NAME   will be effectively
> bypassed as the ownership of the directory is just of the user account
> named; EVIL_USER and the antivirus "manual scan" is running just with
> the privilage of ADMINISTRATOR> 
> 
> by this way a malicious executable can remain hidden in the system
> BYPASSING THE SCAN even when the AV scanner is run by administrator!!!

But I cannot execute this file, becaus I have no access.
If I get access, the anti-virus program will also get access...

So I might be able hide something, but I can't do anything.

Also, to hide something, I have to bypass the autoprotection... You
shouldn't be able to do this...


-- 
Whistl0r