[Snort-users] Some alerts not logging packet data

James Lay jlay at ...13475...
Wed Nov 23 17:44:56 EST 2011

So yeaŠ..guess I needed to clarify that ;)

Just like it saysŠ.most of my alerts on a system I manage come in just
fineŠ.however, some do notŠI get the alert in the alert file, but nothing in
the unified or tcpdump file.  I see the entry like below in the unified
file, but no packet data.  Could this be a library problem or something like
that?  Any one have any hints on where to start?  Thank you.


From:  James Lay <jlay at ...13475...>
Date:  Sat, 19 Nov 2011 08:35:38 -0700
To:  Snort <snort-users at lists.sourceforge.net>
Subject:  [Snort-users] Some packets logging packet data

Topic says itŠ.it's very odd:

>From alert.fast:
11/18-17:30:16.073705  [**] [138:2:1] SENSITIVE-DATA Credit Card Numbers
[**] [Classification: Sensitive Data was Transmitted Across the Network]
[Priority: 2] {TCP} -> <snip>:25

>From the unified2 file:
        sensor id: 0    event id: 1083  event second: 1321662616
event microsecond: 73705
        sig id: 2       gen id: 138     revision: 1      classification: 35
        priority: 2     ip source:     ip destination: <snip>
        src port: 58570 dest port: 25   protocol: 6     impact_flag: 0
blocked: 0

There is no data in the tcpdump file.

Another example:
>From the alert.fastŠinterestingly this entry appears in between an entry
with timestamps of 17:30:28 and 17:36:08:
11/18-16:09:37.800061  [**] [1:13864:5] POLICY Microsoft Watson error
reporting attempt [**] [Classification: Potential Corporate Privacy
Violation] [Priority: 1] {TCP} -> <snip>:80

>From the unified2 file:
        sensor id: 0    event id: 1085  event second: 1321657777
event microsecond: 800061
        sig id: 13864   gen id: 1       revision: 5      classification: 33
        priority: 1     ip source:   ip destination:
        src port: 62377 dest port: 80   protocol: 6     impact_flag: 0
blocked: 0

Nothing in the tcpdump file.

At first I thought it was a pre_proc issue, but now I'm not sureŠ.both of
these events justŠ.have no packet data associated with them.  Any thoughts?
Thank you.


Relevant snort.conf items:

output alert_syslog: LOG_AUTH LOG_ALERT
output log_tcpdump: tcpdump.log
output alert_fast: snortalert.fast
output unified2: filename unified

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