Snort mailing list archives
Re: 1.8.6 problem: Misdetection and hangup
From: Chris Green <cmg () sourcefire com>
Date: Tue, 04 Jun 2002 10:29:40 -0400
Jesus Couto <jesus.couto () satec es> writes:
Hi, This is the setup: A RH 7.2 machine running snort 1.8.6, 2 interfaces, the one we are listening to eth1 connected to a hub with another 2 machines, 192.168.100.1 (the "attacker") and 192.168.100.3 (the "victim"). Problem: Launching some simple portscanning attacks like nmap -sT -p 1-40000 -r 192.168.100.3 from the attacker machine gets reported as "MISC source route lssr" by snort in IDS mode, and after reporting the first 3000-4000 events, snort hangs completly.
Hrm odd. Using 1.8.7-current 06/04-10:26:16.307146 [**] [1:469:1] ICMP PING NMAP [**] [Classification: Attempted Information Leak] [Priority: 2] {ICMP} 10.1.1.52 -> 10.1.1.72 06/04-10:26:16.627530 [**] [100:1:1] spp_portscan: PORTSCAN DETECTED from 10.1.1.52 (THRESHOLD 4 connections exceeded in 0 seconds) [**] 06/04-10:26:16.712279 [**] [1:615:3] SCAN SOCKS Proxy attempt [**] [Classification: Attempted Information Leak] [Priority: 2] {TCP} 10.1.1.52:57906 -> 10.1.1.72:1080 06/04-10:26:17.409593 [**] [1:620:2] SCAN Proxy (8080) attempt [**] [Classification: Attempted Information Leak] [Priority: 2] {TCP} 10.1.1.52:64906 -> 10.1.1.72:8080 06/04-10:26:18.567241 [**] [1:249:1] DDOS mstream client to handler [**] [Classification: Attempted Denial of Service] [Priority: 2] {TCP} 10.1.1.52:55573 -> 10.1.1.72:15104 06/04-10:26:20.158005 [**] [100:2:1] spp_portscan: portscan status from 10.1.1.52: 4808 connections across 1 hosts: TCP(4808), UDP(0) [**]
Not only the packets dont have the lssr option anywhere, as checked by using Ethereal, but snort in sniffer mode also shows them to be without options, and the logging of the packets by snort at the ACID console shows the packet having a few other options (TS) but nothing about source routing. Any ideas? If more info is needed to debug it just tell me what you need.
Send me a pcap of this scan happening if you would please if snort hangs up again. .... Mostly ok here... -- Chris Green <cmg () sourcefire com> To err is human, to moo bovine. _______________________________________________________________ Don't miss the 2002 Sprint PCS Application Developer's Conference August 25-28 in Las Vegas -- http://devcon.sprintpcs.com/adp/index.cfm _______________________________________________ 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:
- 1.8.6 problem: Misdetection and hangup Jesus Couto (Jun 04)
- Re: 1.8.6 problem: Misdetection and hangup Chris Green (Jun 04)