Re: Flaw in Microsoft Domain Account Caching Allows Local Workstation Admins to Temporarily Escalate Privileges and Login as Cached Domain Admin Accounts (2010-M$-002)

["Thor (Hammer of God)" <thor () hammerofgod com>]

In whose universe?   Did you even read the post?  Local admins become LOCAL ADMINS by using a cached domain account who 
is a LOCAL ADMIN. You have to do it with the network cable unplugged.   There is no privilege escalation here. 

StenoPlasma's intent was to educate people on how things worked, and while there isn't a security issue here, he was 
completely correct in that you guys really need to learn what you are talking about.  

t

> -----Original Message-----
> From: full-disclosure-bounces () lists grok org uk [mailto:full-disclosure-
> bounces () lists grok org uk] On Behalf Of jcoyle () winwholesale com
> Sent: Friday, December 10, 2010 11:45 AM
> To: Stefan Kanthak
> Cc: stenoplasma () exploitdevelopment com; full-disclosure () lists grok org uk;
> bugtraq () securityfocus com
> Subject: Re: [Full-disclosure] Flaw in Microsoft Domain Account Caching Allows
> Local Workstation Admins to Temporarily Escalate Privileges and Login as
> Cached Domain Admin Accounts (2010-M$-002)
>
> You are completely missing the point..
> Local admins become Domain Admins.
>
>
>
>
>
> From:       "Stefan Kanthak" <stefan.kanthak () nexgo de>
> To:         <bugtraq () securityfocus com>,
>            <full-disclosure () lists grok org uk>
> Cc:         <stenoplasma () exploitdevelopment com>
> Date:       12/10/2010 01:08 PM
> Subject:    Re: Flaw in Microsoft Domain Account Caching Allows Local
>            Workstation Admins to Temporarily Escalate Privileges and Login
>            as Cached Domain Admin Accounts (2010-M$-002)
>
>
>
> "StenoPlasma @ www.ExploitDevelopment.com" wrote:
>
> Much ado about nothing!
>
> > TITLE:
> > Flaw in Microsoft Domain Account Caching Allows Local Workstation
> > Admins to Temporarily Escalate Privileges and Login as Cached Domain
> > Admin Accounts
>
> There is NO privilege escalation. A local administrator is an admistrator is an
> administrator...
>
> > SUMMARY AND IMPACT:
> > All versions of Microsoft Windows operating systems allow real-time
> > modifications to the Active Directory cached accounts listing stored
> > on all Active Directory domain workstations and servers. This allows
> > domain users that have local administrator privileges on domain assets
> > to modify their cached accounts to masquerade as other domain users
> > that have logged in to those domain assets. This will allow local
> > administrators to temporarily escalate their domain privileges on
> > domain workstations or servers.
>
> Wrong. The local administrator is already local administrator. There's nothing
> the elevate any more.
>
> > If the local administrator masquerades as an Active Directory Domain
> > Admin account, the modified cached account is now free to modify
> > system files and user account profiles using the identity of the
> > Domain Admin's account.
>
> There is no need to masquerade: the local administrator can perform all these
> modifications, and if s/he wishes, hide the tracks: turn off auditing before,
> clear audit/event logs afterwards, change the SID in the ACEs of all objects
> touched (SubInACL.Exe comes handy), ...
>
> Or: just change the "NoDefaultAdminOwner" setting. After that, all
> "Administrators" masquerade as "Administrators". uh-oh.
>
> > This includes
> > creating scripts to run as the Domain Admin account the next time that
> > they log in.
>
> Ridiculous.
> A local administrator can add any script/executable s/he wants to any
> "autostart" (scheduled task, registry, logon script, userinit, shell, ...).
> There's ABSOLUTELY no need to masquerade.
>
> > All files created will not be linked to your domain account in file
> > and folder access lists.
>
> ACEs can always be edited by a local administrator, see SubInACL.Exe, or
> TakeOwn.Exe.
>
> > All security access lists
> > will only show the Domain Admin's account once you log out of the
> > modified cached account. This leads to a number of security issues
> > that I will not attempt to identify in the article. One major issue is
> > the lack of non-repudiation. Editing files and other actions will be
> > completed as another user account. Event log entries for object access
> > will only be created if administrators are auditing successful access
> > to files (This will lead to enormous event log sizes).
>
> A local administrator can turn audit/event logs off, clear or modify them.
>
> Stefan
>
>
>
>
> ***********************************************************
> **********************************
> This email message and any attachments is for use only by the named
> addressee(s) and may contain confidential, privileged and/or proprietary
> information.  If you have received this message in error, please immediately
> notify the sender and delete and destroy the message and all copies.  All
> unauthorized direct or indirect use or disclosure of this message is strictly
> prohibited.  No right to confidentiality or privilege is waived or lost by any
> error in transmission.
> ***********************************************************
> **********************************
>
> _______________________________________________
> Full-Disclosure - We believe in it.
> Charter: http://lists.grok.org.uk/full-disclosure-charter.html
> Hosted and sponsored by Secunia - http://secunia.com/

_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/