[Snort-users] Missing Portscan Records in 2.8

frederick sonnichsen fsonnichsen at ...315...
Mon Mar 31 14:22:24 EDT 2008


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 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 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.
>
> -Leon
>
>  
>
>   
> On 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 at ...14165... <mailto:seclists at ...14165...>>:
>>
>>     Hi 
>>
>>     Looks like there are some problems with your snort.conf
>>
>>>     Mar 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.
>>
>>     -Leon
>>      
>>
>>     On 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?
>>>
>>>      
>>>
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>>
>>
>> <snort.conf><output-snort>
>
>
>------------------------------------------------------------------------
>
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