[Snort-users] Question about rules

Ricardo Barbosa ricardobarbosams at ...6873...
Wed Jan 27 08:40:45 EST 2010


hello rmkml

tested with the parameter-k none, however it did not work
the lib pcap installed but I noticed this in the logs that he does not use it. getting a "snort not using pcap frames. Do I need to use to snort pcap lib? Is this the cause of it not quite get the http payload. Because I changed the rule and how I am doing tests from the browser text links changed the content:"Links" and it worked. I put the word "Links" because it oque appears in the wireshark logs. How do I enable the lib pcap with snort?

I thank.

Regards,

--- Em qua, 27/1/10, rmkml <rmkml at ...953...> escreveu:

De: rmkml <rmkml at ...953...>
Assunto: Re: [Snort-users] Question about rules
Para: "Ricardo Barbosa" <ricardobarbosams at ...6873...>
Cc: rmkml at ...953...
Data: Quarta-feira, 27 de Janeiro de 2010, 7:46

ok thx you,
maybe you have a (network) pcap please?
do you have tested adding "-k none" on cmd line start snort ?
Regards
Rmkml


On Wed, 27 Jan 2010, Ricardo Barbosa wrote:

> Hi rmkml
>
> answering questions
>
>> what snort version you test please?
>
> root at ...14740...:~# snort -V
>
>    ,,_     -*> Snort! <*-
>   o"  )~   Version 2.8.4.1 (Build 38)  
>    ''''    By Martin Roesch & The Snort Team:
> http://www.snort.org/team.html
>            Copyright (C) 1998-2009 Sourcefire, Inc., et al.
>            Using PCRE version: 7.8 2008-09-05
>
> root at ...14740...:~#
>
>
>> Do you send your conf?
>
> /etc/snort/snort.debian.conf
> DEBIAN_SNORT_STARTUP="boot"
> DEBIAN_SNORT_HOME_NET="20.0.0.0/8"
> DEBIAN_SNORT_OPTIONS=""
> DEBIAN_SNORT_INTERFACE="eth0"
> DEBIAN_SNORT_SEND_STATS="true"
> DEBIAN_SNORT_STATS_RCPT="root"
> DEBIAN_SNORT_STATS_THRESHOLD="1"
> /etc/snort/snort.conf
> var HOME_NET $eth0_ADDRESS
> var EXTERNAL_NET any
> var DNS_SERVERS $HOME_NET
> var SMTP_SERVERS $HOME_NET
> var HTTP_SERVERS $HOME_NET
> var SQL_SERVERS $HOME_NET
> var TELNET_SERVERS $HOME_NET
> var SNMP_SERVERS $HOME_NET
> portvar HTTP_PORTS 80
> portvar SHELLCODE_PORTS !80
> portvar ORACLE_PORTS 1521
> var AIM_SERVERS
> [64.12.24.0/23,64.12.28.0/23,64.12.161.0/24,64.12.163.0/24,64.12.200.0/24,205.188.3.0/24,205.188.5.0/24,205.188.7.0/24,205.188.9.0/24,205.188.153.0/24,205.188.179.0/24,205.188.248.0/24]
> var RULE_PATH /etc/snort/rules
> var PREPROC_RULE_PATH /etc/snort/preproc_rules
> dynamicpreprocessor directory /usr/lib/snort_dynamicpreprocessor/
> dynamicengine /usr/lib/snort_dynamicengine/libsf_engine.so
> preprocessor frag3_global: max_frags 65536
> preprocessor frag3_engine: policy first detect_anomalies
> preprocessor stream5_global: max_tcp 8192, track_tcp yes, \
>                               track_udp no
> preprocessor stream5_tcp: policy first, use_static_footprint_sizes
> preprocessor http_inspect: global \
>     iis_unicode_map unicode.map 1252
> preprocessor http_inspect_server: server default \
>     profile all ports { 80 8080 8180 } oversize_dir_length 500
> preprocessor rpc_decode: 111 32771
> preprocessor bo
> preprocessor ftp_telnet: global \
>    encrypted_traffic yes \
>    inspection_type stateful
> preprocessor ftp_telnet_protocol: telnet \
>    normalize \
>    ayt_attack_thresh 200
> preprocessor ftp_telnet_protocol: ftp server default \
>    def_max_param_len 100 \
>    alt_max_param_len 200 { CWD } \
>    cmd_validity MODE < char ASBCZ > \
>    cmd_validity MDTM < [ date nnnnnnnnnnnnnn[.n[n[n]]] ] string > \
>    chk_str_fmt { USER PASS RNFR RNTO SITE MKD } \
>    telnet_cmds yes \
>    data_chan
> preprocessor ftp_telnet_protocol: ftp client default \
>    max_resp_len 256 \
>    bounce yes \
>    telnet_cmds yes
> preprocessor smtp: \
>   ports { 25 587 691 } \
>   inspection_type stateful \
>   normalize cmds \
>   normalize_cmds { EXPN VRFY RCPT } \
>   alt_max_command_line_len 260 { MAIL } \
>   alt_max_command_line_len 300 { RCPT } \
>   alt_max_command_line_len 500 { HELP HELO ETRN } \
>   alt_max_command_line_len 255 { EXPN VRFY }
> preprocessor sfportscan: proto  { all } \
>                          memcap { 10000000 } \
>                          sense_level { low }
> preprocessor dcerpc2
> preprocessor dcerpc2_server: default
> preprocessor dns: \
>     ports { 53 } \
>     enable_rdata_overflow
> preprocessor ssl: noinspect_encrypted, trustservers
> output log_tcpdump: tcpdump.log
> include classification.config
> include reference.config
> include $RULE_PATH/local.rules
> include $RULE_PATH/bad-traffic.rules
> include $RULE_PATH/exploit.rules
> include $RULE_PATH/community-exploit.rules
> include $RULE_PATH/scan.rules
> include $RULE_PATH/finger.rules
> include $RULE_PATH/ftp.rules
> include $RULE_PATH/telnet.rules
> include $RULE_PATH/rpc.rules
> include $RULE_PATH/rservices.rules
> include $RULE_PATH/dos.rules
> include $RULE_PATH/community-dos.rules
> include $RULE_PATH/ddos.rules
> include $RULE_PATH/dns.rules
> include $RULE_PATH/tftp.rules
> include $RULE_PATH/web-cgi.rules
> include $RULE_PATH/web-coldfusion.rules
> include $RULE_PATH/web-iis.rules
> include $RULE_PATH/web-frontpage.rules
> include $RULE_PATH/web-misc.rules
> include $RULE_PATH/web-client.rules
> include $RULE_PATH/web-php.rules
> include $RULE_PATH/community-sql-injection.rules
> include $RULE_PATH/community-web-client.rules
> include $RULE_PATH/community-web-dos.rules
> include $RULE_PATH/community-web-iis.rules
> include $RULE_PATH/community-web-misc.rules
> include $RULE_PATH/community-web-php.rules
> include $RULE_PATH/sql.rules
> include $RULE_PATH/x11.rules
> include $RULE_PATH/icmp.rules
> include $RULE_PATH/netbios.rules
> include $RULE_PATH/misc.rules
> include $RULE_PATH/attack-responses.rules
> include $RULE_PATH/oracle.rules
> include $RULE_PATH/community-oracle.rules
> include $RULE_PATH/mysql.rules
> include $RULE_PATH/snmp.rules
> include $RULE_PATH/community-ftp.rules
> include $RULE_PATH/smtp.rules
> include $RULE_PATH/community-smtp.rules
> include $RULE_PATH/imap.rules
> include $RULE_PATH/community-imap.rules
> include $RULE_PATH/pop2.rules
> include $RULE_PATH/pop3.rules
> include $RULE_PATH/nntp.rules
> include $RULE_PATH/community-nntp.rules
> include $RULE_PATH/community-sip.rules
> include $RULE_PATH/other-ids.rules
> include $RULE_PATH/web-attacks.rules
> include $RULE_PATH/backdoor.rules
> include $RULE_PATH/community-bot.rules
> include $RULE_PATH/community-virus.rules
> include $RULE_PATH/experimental.rules
> include threshold.conf
>
>> snort cmd line starting please?
>
> /usr/sbin/snort -m 027 -D -d -v -l /var/log/snort -u snort -g snort
> -c /etc/snort/snort.conf -S HOME_NET=[10.0.0.0/8] -i eth0
>
>> for example, maybe disable checksum with '-k none' on cmd line...
>> you have created a html page (http reply server side), and you have
>> created a snort rule on client (to server) side...
>> Regards
> In desperation, I tried the following rules
>
> alert tcp 10.0.0.0/8 80 -> any any (content:"teste rule"; msg:"TEST
> HTTP"; sid:100000000;)
> alert tcp any any <> any any (content:"teste rule"; msg:"TEST HTTP";
> sid:100000000;)
> alert tcp any any <> any any (content:"teste rule"; http_client_body;
> msg:"TEST HTTP"; sid:100000000; depth:1000;)
>
> without sucess in all.
>
> no idea where i can be wrong or missing some pre-processador. I thank
>
> Regards.
>
>
>
>
>      ____________________________________________________________________________________
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