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Re: Flaw in Microsoft Domain Account CachingAllows Local Workstation Admins to Temporarily EscalatePrivileges and Login as Cached Domain Admin Accounts (2010-M$-002)
From: "Thor (Hammer of God)" <thor () hammerofgod com>
Date: Mon, 13 Dec 2010 20:47:37 +0000
The attack has some academically interesting details about how cached credentials work, but I agree with Stefan. If you own the machine, you own the machine. What's to stop you from, say, simply installing a rootkit?
Exactly. More importantly, even if you must make users local admins, there is never *any* reason why the domain administrator should interactively log onto a workstation as the domain administrator anyway. Service personnel log on with support accounts, not the domain admin accounts. If they do, well, then you've got other problems. But in this case even if a domain admin logs in interactively (or via RDP), it's not an issue. Cached credentials can't be used for anything other than to log on to the local machine if there is no DC available. After a domain account logs on to a local system, after AD authenticates the request, then *another* hash is made of the hashed password with *a different salt* each time, for each user cached. As far as the academic interest, cached account behavior is a documented process which has been around for years, local admin overwrite capabilities included. t _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/
Current thread:
- Re: Flaw in Microsoft Domain Account Caching Allows Local Workstation Admins to Temporarily Escalate Privileges and Login as Cached Domain Admin Accounts (2010-M$-002), (continued)
- Re: Flaw in Microsoft Domain Account Caching Allows Local Workstation Admins to Temporarily Escalate Privileges and Login as Cached Domain Admin Accounts (2010-M$-002) Thor (Hammer of God) (Dec 13)
- Re: Flaw in Microsoft Domain Account Caching Allows Local Workstation Admins to Temporarily Escalate Privileges and Login as Cached Domain Admin Accounts (2010-M$-002) Peter Setlak (Dec 13)
- Re: Flaw in Microsoft Domain Account CachingAllows Local Workstation Admins to Temporarily Escalate Privileges andLogin as Cached Domain Admin Accounts (2010-M$-002) David Gillett (Dec 13)
- Re: Flaw in Microsoft Domain Account CachingAllows Local Workstation Admins to Temporarily Escalate Privileges andLogin as Cached Domain Admin Accounts (2010-M$-002) Thor (Hammer of God) (Dec 13)
- Re: Flaw in Microsoft Domain AccountCachingAllows Local Workstation Admins to TemporarilyEscalate PrivilegesandLogin as Cached Domain Admin Accounts (2010-M$-002) David Gillett (Dec 13)
- Re: Flaw in Microsoft Domain AccountCachingAllows Local Workstation Admins to TemporarilyEscalate PrivilegesandLogin as Cached Domain Admin Accounts (2010-M$-002) Thor (Hammer of God) (Dec 13)
- Re: Flaw in Microsoft Domain AccountCachingAllows Local Workstation Admins to TemporarilyEscalate PrivilegesandLogin as Cached Domain Admin Accounts (2010-M$-002) Jeffrey Walton (Dec 13)
- Re: Flaw in Microsoft Domain Account CachingAllows Local Workstation Admins to Temporarily Escalate Privileges andLogin as Cached Domain Admin Accounts (2010-M$-002) Michael Bauer (Dec 13)
- Re: Flaw in Microsoft Domain Account CachingAllows Local Workstation Admins to Temporarily EscalatePrivileges and Login as Cached Domain Admin Accounts (2010-M$-002) Stefan Kanthak (Dec 12)
- Re: Flaw in Microsoft Domain Account CachingAllows Local Workstation Admins to Temporarily EscalatePrivileges and Login as Cached Domain Admin Accounts (2010-M$-002) Michael Wojcik (Dec 13)
- Re: Flaw in Microsoft Domain Account CachingAllows Local Workstation Admins to Temporarily EscalatePrivileges and Login as Cached Domain Admin Accounts (2010-M$-002) Thor (Hammer of God) (Dec 13)
- Re: Flaw in Microsoft Domain Account CachingAllows Local Workstation Admins to Temporarily EscalatePrivileges and Login as Cached Domain Admin Accounts (2010-M$-002) Michael Bauer (Dec 13)
- Re: Flaw in Microsoft Domain Account CachingAllows Local Workstation Admins to Temporarily EscalatePrivileges and Login as Cached Domain Admin Accounts (2010-M$-002) Marsh Ray (Dec 13)
- Re: Flaw in Microsoft Domain Account Caching Allows Local Workstation Admins to Temporarily Escalate Privileges and Login as Cached Domain Admin Accounts (2010-M$-002) Thor (Hammer of God) (Dec 10)
- 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) Steve Cobb (Dec 13)