Snort mailing list archives
Missing Portscan Records in 2.8
From: frederick sonnichsen <fsonnichsen () whoi edu>
Date: Mon, 31 Mar 2008 14:22:24 -0400
I have recently installed snort 2.8.0.2 and I no longer get very many portscan alerts when compared to my older version, 2.3.3. Looking at the older alert files, I see records such as the one below. These are missing from my 2.8.0.2 output:
alert from 2.3.3 missing from 2.8.0.2:Mar 31 12:24:19 lyta snort: [122:5:0] (portscan) TCP Filtered Portscan {PROTO255} 128.128.100.76 -> 71.39.148.246
The preprocessors active in my 2.8.0.2 and 2.3.3 versions are listed below. The flow-portscan preprocessor in the 2.8 version is omitted in the sample install file, since stream5 was supposed to replace it. Can anyone tell me if they have installed 2.8 and if they are still getting all the portscan records. I find that the new version does not detect most portscans at this time-
Thanks for any help, Fritz ================== ACTIVE PREPROCESSORS in 2.8.0.2 INSTALL================== dynamicpreprocessor directory /usr/local/lib/snort_dynamicpreprocessor/ preprocessor frag3_global: max_frags 65536 preprocessor frag3_engine: policy first detect_anomalies preprocessor stream5_global: max_tcp 8192, track_tcp yes, \ preprocessor stream5_tcp: policy first, use_static_footprint_sizes preprocessor http_inspect: global \ preprocessor http_inspect_server: server default \ preprocessor rpc_decode: 111 32771 preprocessor bo preprocessor ftp_telnet: global \ preprocessor ftp_telnet_protocol: telnet \ preprocessor ftp_telnet_protocol: ftp server default \ preprocessor ftp_telnet_protocol: ftp client default \ preprocessor smtp: \ preprocessor sfportscan: proto { all } \ preprocessor dcerpc: \ preprocessor dns: \ ================== ACTIVE PREPROCESSORS in 2.3.3 INSTALL================== preprocessor flow: stats_interval 0 hash 2 preprocessor frag2 preprocessor stream4: disable_evasion_alerts detect_scans preprocessor stream4_reassemble preprocessor http_inspect: global iis_unicode_map unicode.map 1252preprocessor http_inspect_server: server default profile all ports { 80 8080 8180 } oversize_dir_length 500
preprocessor rpc_decode: 111 32771 preprocessor bo preprocessor telnet_decode preprocessor flow-portscan: \ preprocessor sfportscan: proto { all } \ Leon wrote:
Hi.You are using a snort.conf from an old version (2.3) of Snort, use the one that came with the 2.8 source and you should get on fine. I guess that you installed an older version of snort from the apt repository.You will want to remove the old versions and then use the snort.conf, and associated stuff from 2.8. You will find them under etc/ in the tarball.-LeonOn 31 Mar 2008, at 14:33, jose wilter frazao wrote:Hi,I change parameter frag2 to frag3 in the /etc/snort/snot.conf, but is showing the next message:Tagged Packet Limit: 256 /etc/snort/snort.conf(214) unknown dynamic preprocessor "frag3" /etc/snort/snort.conf(360) unknown dynamic preprocessor "telnet_decode" /etc/snort/snort.conf(500) unknown dynamic preprocessor "xlink2state" ERROR: Misconfigured dynamic preprocessor(s) Fatal Error, Quitting.. 2008/3/29, Leon <seclists () rm-rf co uk <mailto:seclists () rm-rf co uk>>:HiLooks like there are some problems with your snort.confMar 28 09:23:17 wilter-ubuntu snort[24673]: /etc/snort/snort.conf(214) unknown dynamic preprocessor "frag2"frag2 has been replaced with frag3, You shouldn't have it enabled on line 214 of your snort.conf As for the other errors, post your snort.conf with the full output of a snort -c /etc/snort/snort.conf -T and ill take a look. -LeonOn 28 Mar 2008, at 17:45, jose wilter frazao wrote:Hello,I do downloaded of snort from www.snort.com<http://www.snort.com/> and compiled the Snort with support to Mysql, and I installed in the Ubuntu 7.04. When I insert the command "/usr/local/bin/snort -D -c /etc/snort/snort.conf" for start the daemon of the Snort show the massage in the "/var/log/syslog":Mar 28 09:23:17 wilter-ubuntu snort[24673]: /etc/snort/snort.conf(214) unknown dynamic preprocessor "frag2" Mar 28 09:23:17 wilter-ubuntu snort[24673]: /etc/snort/snort.conf(360) unknown dynamic preprocessor "telnet_decode" Mar 28 09:23:17 wilter-ubuntu snort[24673]: /etc/snort/snort.conf(500) unknown dynamic preprocessor "xlink2state" Mar 28 09:23:17 wilter-ubuntu snort[24673]: FATAL ERROR: Misconfigured dynamic preprocessor(s)What should I do to correct this problem?------------------------------------------------------------------------- Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace_______________________________________________ Snort-users mailing list Snort-users () lists sourceforge net <mailto: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.conf><output-snort>------------------------------------------------------------------------ ------------------------------------------------------------------------- Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace ------------------------------------------------------------------------ _______________________________________________ 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
------------------------------------------------------------------------- Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace
_______________________________________________ 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:
- Snort isn't starting at the Ubuntu: jose wilter frazao (Mar 28)
- Re: Snort isn't starting at the Ubuntu: Leon (Mar 29)
- Message not available
- Re: Snort isn't starting at the Ubuntu: Leon (Mar 31)
- Missing Portscan Records in 2.8 frederick sonnichsen (Mar 31)
- Message not available
- Re: Snort isn't starting at the Ubuntu: Leon (Mar 29)
- Re: Snort isn't starting at the Ubuntu: Joel Esler (Mar 29)
- Re: Snort isn't starting at the Ubuntu: Jack Pepper (Mar 30)