uuups - forgot to cc the list on this one. sorry. -----Forwarded Message----- From: Stefan Janecek <[EMAIL PROTECTED]> To: [EMAIL PROTECTED] Subject: Re: [Full-Disclosure] Re: Automated SSH login attempts? Date: Fri, 30 Jul 2004 11:45:51 +0200
On Thu, 2004-07-29 at 21:35, [EMAIL PROTECTED] wrote: > On Thu, 29 Jul 2004 18:38:15 +0200, Stefan Janecek <[EMAIL PROTECTED]> said: > > > > This does not seem to be a stupid brute force attack, as there is only > > one login attempt per user. Could it be that the tool tries to exploit > > some vulnerability in the sshd, and just tries to look harmless by using > > 'test' and 'guest' as usernames? > > Highly doubtful. It's easy enough to test though - just use the tool > to poke another machine under your control, and use tcpdump or ethereal > to capture all the traffic (don't forget '-s 1500' or similar for tcpdump > to get the *whole* packet). Then somebody familiar with the SSH > protocol can go through it byte by byte and look for anything odd. > > I don't expect we'll find anything, unless it's some very hard to trigger hole > on some odd architecture. Remember - with all of these probes, we're only > seeing a very few boxes actually get 0wned. More likely, script kiddies have > re-discovered the concept that if there's 500 million boxes online, enough of > them are administered by clueless people that they can snarf shells using a > default userid/password pair..... > This is exactly what I did. The tool tries to login as users 'test' and 'guest'. But I don't think it is about just snarfing passwords, because those users did not exist on the compromised machine - yet they got in. My personal feeling is (given their poor success) that they are using some old-fart ssh vulnerability. The compromised machine had an uptime of 254 days if I remember correctly, and was hardly used during this time, nor has it been updated. Still I would really like to know *exactly* what they are doing, just to make sure... _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.netsys.com/full-disclosure-charter.html
