RE: Incorrect payload on acid alerts

["Joshua Berry" <jberry () PENSON COM>]

Several times I have seen a similar issue for HTTP sessions where
multiple HTTP connections are shown for own alert.  It appears that
several sessions had been combined into a single snort alert and many of
these sessions did not match any of the signatures.

-----Original Message-----
From: snort-users-admin () lists sourceforge net
[mailto:snort-users-admin () lists sourceforge net] On Behalf Of Alex
Butcher, ISC/ISYS
Sent: Tuesday, November 09, 2004 8:50 AM
To: Dirk Geschke; snortman () hotpop com
Cc: snort-users () lists sourceforge net
Subject: Re: [Snort-users] Incorrect payload on acid alerts



--On 09 November 2004 14:58 +0100 Dirk Geschke <Dirk_Geschke () genua de> 
wrote:

> Hi,
>
> > I have a snort version 2.1.0 installed a few month now and it worked
> > fine.
> >
> > Alerts output is to mysql and acid.
> >
> > Recently I added a Microsoft sms server which createstons of alerts
> >
> > For example : WEB-MISC http directory traversal
> >
> > The problem is when I look at the payload I can see the beginning of
the
> > payload which was actually sent to the sms server and the rest
completely
> > different sessions (parts of email messages , part of telnet
sessions)
> > the alert is generated by the wrong part of the payload.
> >
> > Can anyone help me ?
>
> yes, upgrade to snort-2.1.3 or better to snort-2.2.0.
>
> There were some bugs within stream4 which caused a mixup of parts
> from other sessions.

I've seen this in 2.2.0, also. :-(

The checksum has been wrong in these cases.

I wasn't sure whether it was caused by a bug in the switch whose ports
I'm spanning, or snort, otherwise I'd have reported it before now.

> Dirk

Best Regards,
Alex.
-- 
Alex Butcher: Security & Integrity, Personal Computer Systems Group
Information Systems and Computing             GPG Key ID: F9B27DC9
GPG Fingerprint: D62A DD83 A0B8 D174 49C4 2849 832D 6C72 F9B2 7DC9




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