Re: DNS and SMTP

[Alvin Oga <alvin.sec () Virtual Linux-Consulting com>]

hi ya

> On Fri, 2004-05-28 at 09:16, kaps lock wrote:
> > Hi All,
> > I am a security new bie.I would like to know or
> > atleast if somebody can have me some pointers to good
> > turtorials on

read ... the first 10 pages of all the links that google
returns for each "search string" you give it .. 

> > 1)DNS
> > basically i want to be able to understand everything
> > about DNS ,using nslookup,dig inorder to be a good
> > security analyst.

knowing how to use the wrong tools wont help  with being
a "security analyst"
        - what kind of analyst ??
        ( writing articles for general public or for teaching
        ( security classes for certification ?

as it has been pointed out ... read both books about DNS
by cricket liu ( not just the oreilly one )

- you/we will never know "everything" about dns

> like how i could determine OS of a
> > dns server ,

nmap -O  1.2.3.4

or nessus or queso or ...

> or say how i could determine what evrsion
> > of BIND  it is using etc.

telnet  1.2.3.4 53
        - and if you believe the answer, there might be
        a nice lakefront land for sale in the nevada dessert too

> > 2)SMTP
> > If somebody could tell me what is an Object ID and how
> > does it function and how it is decided upon!!Like the
> > tree that is followed.Also could a system be
> > compromised if a attacker nows the communitry string?

always, always assume the attacker already has root access 
to any of your servers and try to protect whatever you are
trying to protect and why and at what costs and what
are ALL of the consequences of them doing "rm -rf /" on that server
and any other server that they can get into

c ya
alvin

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