On Tuesday 24 February 2015 08:53:04 Chris Murphy wrote: > On Tue, Feb 24, 2015 at 8:45 AM, Stephen John Smoogen <smooge@xxxxxxxxx> wrote: > > On 24 February 2015 at 05:46, Hubert Kario <hkario@xxxxxxxxxx> wrote: > >> On Tuesday 24 February 2015 13:08:46 Tomas Mraz wrote: > >> > On Út, 2015-02-24 at 12:32 +0100, Hubert Kario wrote: > >> > > rate limiting and denyhosts have no impact what so ever when the > >> > > attacker > >> > > has a botnet to his disposal > >> > > >> > Large botnet means that the attack is targeted. I do not think we can > >> > prevent targeted attack against weak password in the default > >> > configuration. What we should aim at is prevention of non-targeted > >> > attacks such as attacks you can see when you open ssh port on a public > >> > IP almost immediately. These attacks usually come from single IP > >> > address. > >> > >> Not necessarily, I've seen both - where an IP did try just 2 or 3 > >> password/user combinations and ones that did try dozens. > >> > >> Having access to botnet is not uncommon or expensive, making it possible > >> for > >> "bored student" kind of targeted attacks. You can do low level of such an > >> attack with just EC2. > >> > >> I'm not saying that we shouldn't have rate limiting, but it shouldn't be > >> the > >> only thing above simple dictionary check. > > > > That matches what I am seeing with a couple of random servers I have out > > there. The number of attacks where IP address one is doing > > > > apple:apple > > apple:123456 > > apple:trustn01 > > apple:... > > bob:bob > > bob:123456 > > bob:trustn01 > > bob:password > > Half of these will be allowed with the current installer behavior: > # pwscore > apple:123456 > 55 > # pwscore > apple:trustn01 > 84 > # pwscore > bob:trustn01 > 55 > # pwscore > bob:password > 58 I think that Stephen meant: for user name 'apple' the attacker tries 'apple', '123456', 'trustn01', etc. for user name 'bob'... But yes, 'trustn01' is accepted, with score of 1 though if trustn01 is really a third password tested it's rather surprising, it is on 83823 position (tied with 3493 other passwords) in the RockYou list -- Regards, Hubert Kario Quality Engineer, QE BaseOS Security team Web: www.cz.redhat.com Red Hat Czech s.r.o., Purkyňova 99/71, 612 45, Brno, Czech Republic
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