[Snort-devel] Snort so rules seems not working

Paul Tsang paul.tsang at ...3356...
Tue Jan 8 22:27:46 EST 2013

Dear develop team,


I have install snort with barnyard2 successfully. 

Here is my install snort: 



make install


1.       When I only enable rule, using Nessus Scan, there are alert
(like: SQL union select - possible sql injection attempt - GET parameter.)

2.       When I only enable so rule, using Nessus Scan, there NO alert.

Bellowing is the step to enable so rule:

cp so_rules/precompiled/Centos-5-4/x86-64/*

Change snort.conf 

2.1   Make sure the dynamic preprocessor and dynamic engine paths are

a.       dynamicpreprocessor directory

b.      dynamicengine /usr/local/lib/snort_dynamicengine/libsf_engine.so

        2.2  Make sure the path to the location of the shared object rules

c.       dynamicdetection directory /usr/local/lib/snort_dynamicrule


        2.3  Dump the stub rules by issuing the command:

d.      snort -c /usr/local/etc/snort/snort.conf


        2.4. Dump the stub rules by issuing the command: (run ok)

 snort -c  /etc/snort/snort.conf --dump-dynamic-rules= /snort/so_rules


Attached with my snort configuration file. Please provide me the
suggestion, what is going on my so rule and provide the solution. Thanks!


Best regards, 

Paul Tsang 
Assistant Security Consultant

Security Services

CITIC Telecom International CPC Limited

20/F, Lincoln House, Taikoo Place, 979 King's Road, Quarry Bay, Hong Kong 
D: (852) 2170 2529   F: (852) 2795 1262

E:  <mailto:eric.chan at ...3356...> paul.tsang at ...3356...   W:

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