Security Incidents mailing list archives
Re: Odd identd behavior
From: Brian Smith-Sweeney <tinbox () nyct net>
Date: Mon, 14 Nov 2005 15:27:48 -0500
Everyone I believe did read his message. Yes, he said mailserver logs, but that's because the mailservers in question were connecting back to the ident port which is fairly standard behavior. What's not standard is that they were getting a response back from the service listening on the ident port that was not consistent with an ident server. While 220 as you noted is a valid mailserver response, it's *not* a valid ident server response. The conclusion of "it looks like an FTP server" is based on the fact that many warez kiddies install FTP servers on non-standard ports, and that the remainder of the header (..:: ?lit?-Cr?w Rulez ::..) looks like a warez banner. The easiest way to verify would be to attempt FTP protocol negotiation to the port in question to see what happens, but I'm guessing the majority of folks who posted to the list are correct: it's FTP. Also, if you're going to attempt to correct people by citing RFC's, it's best to use the right RFC. =) RFC 793 is TCP; RFC 2821 (and old 821) discuss SMTP, which is I assume what you meant to reference. My guess is the ::.. stuff is just to look cool, but I suppose it's possible it has a dual purpose. Cheers, Brian Levenglick, Jeff wrote:
Ok.... It's a good thing we all read his message... He said mail server logs.... 220 is a valid MAIL server response. see http://www.rfc-editor.org/rfc/rfc793.txt 220 <domain> Service ready Where did ftp come from? Now.. Why does it say: 220 ..:: ?lit?-Cr?w Rulez ::....530 Not logged in... Because that is what they put as the ident of the mail server- ..:: ?lit?-Cr?w Rulez ::....530 Not logged in... My quick quess is that ..:: when sent to a daemon could overflow or maybe do something it is not supposed to. (ie: a parse bug) Or the mail server was hacked and they replaced the ident of the box with their name. OR the host was hacked and the host name was changed. Assuming a Unix box, did you check your host name? hostname or uname -a
Current thread:
- Odd identd behavior Mike Owen (Nov 14)
- Re: Odd identd behavior Christopher E. Cramer (Nov 14)
- Re: Odd identd behavior kgp (Nov 14)
- Re: Odd identd behavior Mike Owen (Nov 14)
- <Possible follow-ups>
- Re: Odd identd behavior k levinson (Nov 14)
- Re: Odd identd behavior Steve.Cummings (Nov 14)
- RE: Odd identd behavior Levenglick, Jeff (Nov 14)
- Re: Odd identd behavior Brian Smith-Sweeney (Nov 14)
- RE: Odd identd behavior k levinson (Nov 14)
- RE: Odd identd behavior Andrew Simmons (Nov 14)
- RE: Odd identd behavior Levenglick, Jeff (Nov 15)
- Re: Odd identd behavior Mike Owen (Nov 15)
- Re: Odd identd behavior kgp (Nov 15)
- Re: Odd identd behavior Ansgar -59cobalt- Wiechers (Nov 16)
- Re: Odd identd behavior Barrie Dempster (Nov 16)
- Re: Odd identd behavior Mike Owen (Nov 15)
- Re: Odd identd behavior Ansgar -59cobalt- Wiechers (Nov 16)
- Re: Odd identd behavior Lionel Ferette (Nov 16)
- Re: Odd identd behavior Ansgar -59cobalt- Wiechers (Nov 17)
- Re: Odd identd behavior Christopher E. Cramer (Nov 14)