Date: Tue, 12 Feb 2008 11:34:23 -0500
From: <dudevanwinkle@...h.ai>
To: <full-disclosure@...ts.grok.org.uk>,<contactme@...lashpraveen.com>
Subject: Re: Brute force attack - need your advice

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NP FULL-DISCLOSURE ALWAYS IS HAPPY TO SUPPORT AL QAEDA

On Tue, 12 Feb 2008 03:51:02 -0500 Abilash Praveen
<contactme@...lashpraveen.com> wrote:
>Hello experts,
>
>Thank for all your rude, honest, polite, helpful replies. I'm
>really glad I
>posted here and most of your replies (if not all) are very useful
>to me.
>Sorry iam not able to reply individually to everyone and thank
>you. I've
>been using a couple of servers and it was very unusal for me to
>get brute
>force on the server in which my persona website is hosted. That is
>the
>reason i posted this question.
>
>Anyway, I shall keep the server tight. Thanks for the port scan
>report you
>have pasted and also the advice on keeping the SSH on a different
>port.
>Thanks again to everyone who has replied.
>
>Kind regards,
>Abilash
>
>
>On 2/12/08, Keith Kilroy <keith@...uritynow.us> wrote:
>>
>> Lock down your server so only needed ports are open, move ssh
>above
>> the norm scan range, setup SNORT and learn how to use it, harden
>and
>> update all progz. Check for web app holes.....buffer overflows
>etc.
>>
>> The only box that is safe is the one unplugged hdd removed and
>> destroyed and rest of system locked in a closet.
>>
>> I just came off a gig with a presidential candidate (a lot of
>attacks
>> are targeted at those guys), ever heard of DDOS and botnets.
>move all
>> default ports you can and have their services report different
>than
>> what is really there.
>>
>> Just perform your due diligence and watch and archive your logs.
>>
>> If you are detecting the brute force attacks then you can stop
>them.
>>
>> Believe me if you've posted anywhere before your email is out
>anyway.
>> Just try to stay ahead of the curve. Harden, log, respond. Oh
>yeah be
>> sure to perform your backups, if someone besides a Script Kiddie
>wants
>> in they'll get in. The only way to get ISP's to cooperate
>sometimes
>> involve getting the FBI involved (very fun and time consuming)
>but be
>> ready for them to seize your servers until either you (if a
>forensic
>> specialist) or they create a sound image /w hashes of your
>drives. but
>> most can be traced to the source if it too bad, you'll just go
>through
>> hell and strict guidelines that must be followed if you get them
>> involved. But if you try to hack back you'll be on the wrong
>side of
>> the bars. so tread lightly. better off securing your stuff and
>> monitoring with dynamic blocking that times out after a period
>of
>> time. Rank the attacker when it hits a 5 blockem for 30 min then
>if it
>> reoccurs and they achieve a high score then auto block em again
>> longer. the scripts are not that hard to write. Heck you can
>even
>> google and download some to get you started. chances are if you
>are
>> not real easy to exploit  they'll move on to the next box.
>>
>> Most here would rather report the vulnerabilities so you can fix
>em.
>>
>> my 2cents take it for what it's worth.
>>
>> On Feb 12, 2008, at 2:41 AM, Tonnerre Lombard wrote:
>>
>> > Salut, Abilash,
>> >
>> > On Tue, 12 Feb 2008 02:16:02 +0530, Abilash Praveen wrote:
>> >> I had been talking to our web hosts the other day and they
>seem to
>> >> have a lot of unusual brute force attack on the servers
>recently. I'm
>> >> guessing that it could be because of my emails to the list? I
>mean,
>> >> do you advice on using a personal email for this type of
>list? Or
>> >> should I use something like @ gmail.com? I know they can't
>easily
>> >> break in to our servers, but am I just giving them a chance?
>> >
>> > I don't really think that this is closely related to the use
>of your
>> > mail address. Outside in the real nature, there is
>rain/snow/whatever,
>> > which occurs from time to time in some type of natural cycle,
>and you
>> > can't help it.
>> >
>> > The same goes for SPAM and worms/virii/other automated
>attacks.
>> > They'll
>> > always be there, like the rain and the show. What you should
>do is put
>> > on a rain coat: make sure your systems are up to date and
>looking
>> > regularly for holes in the coat. Keep the SPAM and worms off
>yourself,
>> > and whatever flies through your network is just random noise.
>> >
>> > (But please don't deduce from this posting that you should use
>it as
>> > input in a random number generator to generate cryptographic
>keys!)
>> >
>> >                               Tonnerre
>> > --
>> > SyGroup GmbH
>> > Tonnerre Lombard
>> >
>> > Solutions Systematiques
>> > Tel:+41 61 333 80 33          Güterstrasse 86
>> > Fax:+41 61 383 14 67          4053 Basel
>> > Web:www.sygroup.ch            tonnerre.lombard@...roup.ch
>> > _______________________________________________
>> > Full-Disclosure - We believe in it.
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>>
>>
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