Snort mailing list archives
RE: Bug/Feature in Snort?
From: "Paul Farley" <Paul.Farley () EventLevel com>
Date: Sun, 10 Mar 2002 19:28:07 -0500
Ryan, There are a few questions centered around that very fact. 1. Why did the ack packet my box returned set off that rule? The ack was headed in the wrong direction AND did not have the content specified in the rule. I could accept maybe a misconfiguration of HOME_NET as a cause for the direction of traffic issue, but that packet doesn't have the content the rule is looking for. Ack packet: 02/16-03:25:26.843748 MY.NET.9.170:80 -> 66.76.77.48:4832 TCP TTL:127 TOS:0x0 ID:49657 IpLen:20 DgmLen:40 DF ***A**** Seq: 0x4A529D53 Ack: 0xE74AC1BC Win: 0x4428 TcpLen: 20 2. Why the difference between the packet TTL and the TTL reported in the alert? Regards, Paul Farley EventLevel, Inc. Paul.Farley () EventLevel com http://www.eventlevel.com -----Original Message----- From: snort-users-admin () lists sourceforge net [mailto:snort-users-admin () lists sourceforge net] On Behalf Of Ryan Russell Sent: Sunday, March 10, 2002 6:56 PM To: Paul Farley Cc: snort-users () lists sourceforge net Subject: Re: [Snort-users] Bug/Feature in Snort? On Sun, 10 Mar 2002, Paul Farley wrote:
If you observe the TTL values for all three of the alerts, the 1st and 3rd packets have a TTL of 115, which is reasonable considering this attack originates from Windows hosts, and often the starting TTL value for Windows hosts is 128. The 2nd packet however has a TTL of 255, which is inconsistent with the other two packets. In addition the
Your web server echoed something back from the attempt that set off the same rule. Ryan _______________________________________________ Snort-users mailing list Snort-users () lists sourceforge net Go to this URL to change user options or unsubscribe: https://lists.sourceforge.net/lists/listinfo/snort-users Snort-users list archive: http://www.geocrawler.com/redir-sf.php3?list=snort-users _______________________________________________ Snort-users mailing list Snort-users () lists sourceforge net Go to this URL to change user options or unsubscribe: https://lists.sourceforge.net/lists/listinfo/snort-users Snort-users list archive: http://www.geocrawler.com/redir-sf.php3?list=snort-users
Current thread:
- Bug/Feature in Snort? Paul Farley (Mar 10)
- Re: Bug/Feature in Snort? Ryan Russell (Mar 10)
- RE: Bug/Feature in Snort? Paul Farley (Mar 10)
- Re: Bug/Feature in Snort? Martin Roesch (Mar 10)
- Re: Bug/Feature in Snort? Ryan Russell (Mar 10)