RE: [Full-disclosure] Active Directory accounts

["Angel Barrio" <abmartinez@xxxxxxxxxxxx>]

Hi Steve,

Yes I was aware that the LastLogon property is not replicated among ADs and 
therefore, in my script,  I query for the LastLogon property value of every 
user at every AD within our domain and eventually I keep record of the last 
date registered among all the controllers.

It seems that the testing you've done confirms my theory about how and when the 
LastLogon property is updated. It's good to know that this property changes 
every time the user authenticates to the domain regardless the way it does, 
otherwise this property would not be reliable to look at for security concerns.

Thank you very much for your information.

Regards, 

--------------------------------------------------------
Angel Barrio Martínez,
 
Systems Security Engineer
 
mail: abmartinez@xxxxxxxxxxxx
phone: +34 944011768
fax: 944011030
 
LinkedIn: http://www.linkedin.com/in/abmartinez
 
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-----Mensaje original-----
De: full-disclosure-bounces@xxxxxxxxxxxxxxxxx 
[mailto:full-disclosure-bounces@xxxxxxxxxxxxxxxxx] En nombre de Steven Rakick
Enviado el: viernes, 08 de septiembre de 2006 15:00
Para: full-disclosure@xxxxxxxxxxxxxxxxx
Asunto: RE: [Full-disclosure] Active Directory accounts

Hello Angel,

You are aware that the lastLogon property isn't
replicated right? If you have a multi-domain
controller environment, you have to poll each DC for
the lastLogon value to get an accurate value. That was
probably the reason for the inconsistency. I have
already validated that AD Inspector polls all domain
controllers for the value. My concern was more along
the lines of at what point is the lastLogon updated.
I've done some testing and it does appear that it's
updated any time the object authenticates, regardless
of how or where.


From: full-disclosure-bounces@xxxxxxxxxxxxxxxxx
[mailto:full-disclosure-bounces@xxxxxxxxxxxxxxxxx] On
Behalf Of Angel Barrio
Sent: Friday, September 08, 2006 7:13 AM
To: full-disclosure@xxxxxxxxxxxxxxxxx
Subject: RE: [Full-disclosure] Active Directory
accounts


Hi

We have recently developed a script to gather detailed
user information from our AD in order to identify user
accounts not used for a long time and proceed with
deletion of such users. 

During our test, at least we have observed that the
LastLogon property is changed not only with the
interactively logon to a desktop system, but also
while mapping a network drive. We have not tested it
with third party applications that make use of the AD
just as and LDAP for authentication, but it is very
likely that this property will also be updated this
way.

Regards,
--------------------------------------------------------
Angel Barrio Martínez,
 
Systems Security Engineer
 
mail: abmartinez@xxxxxxxxxxxx
phone: +34 944011768
fax: 944011030


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