[Snort-sigs] Only an empty Alert file :(

Dean Farwood dean_farwood at ...1143...
Tue Mar 13 09:30:41 EDT 2012



Thanks for your interest.


I followed your advice and logged the session as -K pcap. I checked the
capture on Wireshark and indeed, the word "password" is included in one of
the frames. 


Interestingly I had to use the command

snort -dev -l /etc/snort/log2 -K pcap


When I tried the command 

snort -dev -c /etc/snort/snort.conf -l /etc/snort/log2 -K pcap

nothing was logged except that darned empty alert file.


I wish I knew why adding the -c argument messes up logging?



From: Joel Esler [mailto:jesler at ...435...] 
Sent: Monday, March 12, 2012 5:35 AM
To: Dean Farwood
Cc: snort-sigs at lists.sourceforge.net
Subject: Re: [Snort-sigs] Only an empty Alert file :(


I suggest you capture the packet to disk.  Then you can use Snort to read
the pcap with -r.


You need to review the pcap to see if the word "password" really does exist
in plaintext in the stream.



I am betting it doesn't.




On Mar 11, 2012, at 6:40 PM, Dean Farwood wrote:



I'm running Snort (Build 121) on Ubuntu 11.10 with 3.0.0-16-generic


I have written the following rule called /etc/snort/rules/password.rules:


alert tcp any any <> any (content:"password"; msg:"Potential
Password Violation"; sid: 11995522;)


My snort command is:

snort -dev -c /etc/snort/snort.conf -l /etc/snort/log2 -K ascii


I then transfer a file with the word "password" in it from the Linux system
to a Windows system using Samba. The packets are captured as evidenced by
the terminal display. The Windows system successfully authenticates to Samba
and the file can be viewed on the Windows system.


PROBLEM: No directories are created in the /etc/snort/log2 directories. Only
an empty "Alert" file appears.


If I run a command like:


snort -dev -l /etc/snort/log2 -K ascii


I get normal logging directories with IP address directory names etc.


This command also results in nothing in /etc/snort/log2 except the empty
alert file.

snort -dev -c /etc/snort/rules/password.rules -l /etc/snort/log2 -K ascii


REQUEST: Any help I can get to allow proper logging when using the -c option
would be much appreciated.











snort -dev -c /etc/snort/snort.conf -l /etc/snort/log2 -K ascii

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