full-disclosure - Re: RE: when will AV vendors fix this???

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Message-ID: <e024ccca0608071148m61220d1cybf342144f0144a13@mail.gmail.com>
Date: Mon, 7 Aug 2006 14:48:51 -0400
From: "Dude VanWinkle" <dudevanwinkle@...il.com>
To: "Thomas D." <whistl0r@...glemail.com>
Cc: bugtraq@...urityfocus.com, full-disclosure@...ts.grok.org.uk
Subject: Re: RE: when will AV vendors fix this???

On 8/7/06, Thomas D. <whistl0r@...glemail.com> wrote:
>
> > -----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.

Well, there would be an access denied message for most AV scanners
when it hit the file in question and couldnt even get a read.

-JP

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