full-disclosure - Re: Flaw in Microsoft Domain AccountCachingAllows Local Workstation Admins to TemporarilyEscalate PrivilegesandLogin as Cached Domain Admin Accounts (2010-M$-002)

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Message-ID: <AANLkTikF=+H3ybYg0T6COR=bHwdA1W8yX-WjXLd2G=Wy@mail.gmail.com>
Date: Mon, 13 Dec 2010 15:18:51 -0500
From: Jeffrey Walton <noloader@...il.com>
To: David Gillett <gillettdavid@...a.edu>
Cc: full-disclosure@...ts.grok.org.uk, bugtraq@...urityfocus.com,
	George Carlson <gcarlson@...s.edu>
Subject: Re: Flaw in Microsoft Domain AccountCachingAllows
 Local Workstation Admins to TemporarilyEscalate PrivilegesandLogin as
 Cached Domain Admin Accounts (2010-M$-002)

On Mon, Dec 13, 2010 at 2:13 PM, David Gillett <gillettdavid@...a.edu> wrote:
> If our users hadn't been local admins (not my choice), they would not have
> been able to eject Domain Admins from the Local Admins group in the first
> place....
Ouch! But at least it keeps the help desk calls down ;)

> -----Original Message-----
> From: Thor (Hammer of God) [mailto:thor@...merofgod.com]
> Sent: Monday, December 13, 2010 10:49
> To: David Gillett; 'George Carlson'; bugtraq@...urityfocus.com;
> full-disclosure@...ts.grok.org.uk
> Subject: RE: [Full-disclosure] Flaw in Microsoft Domain AccountCachingAllows
> Local Workstation Admins to TemporarilyEscalate PrivilegesandLogin as Cached
> Domain Admin Accounts (2010-M$-002)
>
> You made all domain users local admin?  Or did you do some sort of RUNAS in
> the logon script?
>
>>-----Original Message-----
>>From: David Gillett [mailto:gillettdavid@...a.edu]
>>Sent: Monday, December 13, 2010 10:16 AM
>>To: Thor (Hammer of God); 'George Carlson'; bugtraq@...urityfocus.com;
>>full-disclosure@...ts.grok.org.uk
>>Subject: RE: [Full-disclosure] Flaw in Microsoft Domain Account
>>CachingAllows Local Workstation Admins to Temporarily Escalate
>>Privileges andLogin as Cached Domain Admin Accounts (2010-M$-002)
>>
>>> If I take the domain admin out of my local administrators, they can't
>>> do
>>anything.  Done.
>>
>>  Back when I did AD/domain support, all domain user accounts got a
>>profile that included a trivial script to re-add Domain Admins to the
>>Local Admins group.  So this kind of local removal shenanigans lasted
>>only until the user next logged into the domain.
>>
>>David Gillett
>

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