Re: Snort Abend after BAD-TRAFFIC

[Jason Haar <Jason.Haar () trimble co nz>]

On Mon, 2004-03-22 at 07:59, Mark.Schutzmann () Omron com wrote:
> Mar 21 13:56:09 OEI-RHLXSnort snort: [1:528:4] BAD-TRAFFIC loopback traffic
> [Classification: Potentially Bad Traffic] [Priority: 2]: {TCP} 127.0.0.1:80
> -> 209.176.3.124:1577

Wow - that's a weird one. This is TCP traffic between a valid address
and a loopback address. Unless your snort box is actually on address
209.176.3.124, that shouldn't happen.

I've seen tonnes of broken software (Compaq InSight Manager for
starters) produce loopback traffic before - but only ICMP and UDP -
neither of which require the establishment of a "session" to operate
(unlike TCP). 

I mean, this says that  209.176.3.124 has a route to the 127 network
that passes by your Snort IDS sniffer, and that a Web server is
responding OUT ITS ETHERNET CARD to such connections. This sounds nearly
impossible.

Is 209.176.3.124 the IP address of the Snort box? Then it all makes
sense...

-- 
Cheers

Jason Haar
Information Security Manager, Trimble Navigation Ltd.
Phone: +64 3 9635 377 Fax: +64 3 9635 417
PGP Fingerprint: 7A2E 0407 C9A6 CAF6 2B9F 8422 C063 5EBB FE1D 66D1


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