Re: domain admin account impersontating

hi

thank you for your input. your reply was ver enlighthning on this matter.
what i have learnt is that the domain account should be unique in a network
environment, domain oriented or not. period.
of course that a domain is much more than user authentication. i kinda
exxxagerated by saying breaking, but the point was that on a machine out of
the domain, i was acting as domain admin. tiny little issue that in my
opinion, but just shouldn't happen but as a ms workstation and server user,
i must beleive that it happens for a reason and a good one. if i'm not happy
with it, file a report at microsoft and if the management at my company
simply see this as a major security issue ( which i don't ), well, there are
other options.

i guees that the bottom line is that the domain admin account can be
impersonated, with the same username and password. a somewhat esoteric
scenario but that's just it.

i appreciate your info on the security settings on ie ( actually we are on
firefox ) but thank you the same.
thank you once again.

PLeite
-----------------------------------
"Roger Abell [MVP]" <mvpNoSpam@xxxxxxx> escreveu na mensagem
news:%23VJaPYnAHHA.5060@xxxxxxxxxxxxxxxxxxxxxxx
Yes, I do believe it is "by design".

Starting with Windows XP this became less simple, whereby
the accessing XP system will be seen to send, not "username"
and its password response which the accessed system will, in
absence of a qualified domain\username take as "username" as
defined on it (the accessed system), but instead the accessing
XP will be seen to send XPhost.domain.tld\username (qualified
with the DNS domain of the XP) which of course will fail. One
then sees XPhost.domain.tld\username in a prompt asking for
password and thinks it tries this instead of sending just "username",
but this one with the DNS domain is done as a retry action as
is shown as it was the last attempted.

There is no test as to what groups the account is member in before
attempting behind the scenes authentication.

I do not see how it breaks the domain concept. I mean, if someone
knows the username and password for an account in the domain so
that they can do this then they really do not need to do this.

You may want to pay attention to the IE Options setting under Advanced
in Security section that enables Windows Integrated Authentication and
also to the ability by XP and later Windows to cache Windows network
credentials (i.e. start/run keymgr.dll).

Roger


"Pedro Leite" <aa> wrote in message
news:OzmcYPlAHHA.4496@xxxxxxxxxxxxxxxxxxxxxxx
good morning

thank you for the information.
so, can we say that is " by design " ?? it happens because it does. (
not
flaming, just trying to make things clear )
does this happens only on admin accounts ? can i create an user on the
off
domain pc and logo to the shares with the user's domain password ?? this
kind of breaks the concept of windows domains doesn't it ??

apart from the obvious of having the domain admin account " on the loose
",
are thre any other security issues that i should be on the lookout for
??
and before someone says it, i fully agree that having the local admin
user
equal to the domain admin is a cumbersome error. a malpractice that i
must
correct.

thank you
PLeite
-------------------------------------------------------------------
"Roger Abell [MVP]" <mvpNoSpam@xxxxxxx> escreveu na mensagem
news:%23cqF1faAHHA.4592@xxxxxxxxxxxxxxxxxxxxxxx
Windows has done this for a very long time.
If you have two accounts, in separate authentication realms, and those
accounts have the same name and password, then while using one of
them it is possible to access resources in the other realm by means of
the other account. This happens "transparently" with a login behind
the scenes when an access attempt is made. It is not a matter of the
accounts having the same SID (which they do not) but that one can
log in as the other by presenting its own credentials since they match.


"Pedro Leite" <aa> wrote in message
news:%23eBIMYaAHHA.4592@xxxxxxxxxxxxxxxxxxxxxxx
good afternoon

can anyone explain this behaviour ?? as described
setup is sbs 2k3

recently added a new pc to the network and to the domain for updates
and
application deployment.
so, i named the pc admin account the same as the domain admin account
and
gave it the same password.
now, the new pc is off the domain but the admin account is still the
same
with the same domain admin password.

whenever i log to the pc with the admin account, i have full control
over
the domain machines, c$ share, all users document folders, all
shares,
direct internet acces through the firewall...

questions, is the domain admin sid the same as a local admin sid's
account
?? the authentication being made with a blend of username and
password,
all
mixed up, hashed whatever and then sent to validation ??

isn't the domain admin account user equal to domainname\admin and the
local
admin, machinename\admin ??

for my knowledge please comment on the above

thank you

Pedro Leite


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