Re: Snort Abend after BAD-TRAFFIC

[Jason <security () brvenik com>]

I would look at a few things

- You snort config, if you are using -i any and browsing a webserver on 
localhost or using some form of tunneling then this is a likely culprit, 
your PIX logs suggest this is not the case.

- See if the MAC address of the 127.0.0.1 host, is it on your local net.

- Investigate the host generating the 127.0.0.1 traffic for bad stuff. 
Assuming the system is on your local net I suspect you have a few alerts 
from that source MAC besides these.

Hopefully you have the pkts logged to give you more insight.


Mark.Schutzmann () Omron com wrote:

> Jason,
>
> Thanks for your insight. It makes sense that if I am getting slammed with
> something that the file structure would grow enormously. As a matter of
> fact, I was unable to do an rm -rf /var/log/snort/* as it was giving me an
> error. Coincidentally, I have been seeing a ton of this type of traffic
> from my Cisco PIX firewall:
>
> 106016: Deny IP spoof from (127.0.0.1) to 209.176.173.238 on interface
> inside
> 106016: Deny IP spoof from (127.0.0.1) to 209.176.238.238 on interface
> inside
> 106016: Deny IP spoof from (127.0.0.1) to 209.176.49.110 on interface
> inside
>
> ...and also a ton of this from Snort:
>
> 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
> 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
> -> 209.176.16.250:1260
> 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
> -> 209.176.16.250:1260
> 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
> -> 209.176.81.250:1095
>
>
> Any ideas about whether this is a security breach or new worm? I have never
> seen this prior to today.
>
> Thanks,
> Mark
>
>
>                                                                                                                                                   
>                       Jason <security () brvenik com>                                                                                                
>                       Sent by:                            To:       Mark.Schutzmann () Omron com                                                     
>                       snort-users-admin () lists sour        cc:       snort-users () lists sourceforge net                                             
>                       ceforge.net                         Subject:  Re: [Snort-users] Snort Abend after BAD-TRAFFIC                               
>                                                                                                                                                   
>                                                                                                                                                   
>                       03/21/2004 10:56 AM                                                                                                         
>                                                                                                                                                   
>                                                                                                                                                   
>
>
>
>
> I believe your problem will be resolved by moving to a different logging
> format.
>
> the message
>
> Mar 21 10:28:37 OEI-RHLXSnort snort: FATAL ERROR: OpenLogFile() =>
> mkdir(/var/log/snort/209.176.247.84) log directory: Too many link
> s
>
> indicates you have too many files under the current directory.
>
>
> Mark.Schutzmann () Omron com wrote:
>
>
> > I saw these messages in my syslog this morning after an alert that Snort
> > had abended. There were more than 100 of the BAD-TRAFFIC messages though.
> > Does anyone have any suggestions about whether there is some
>
> configuration
>
> > in my snort.conf or other external factors that could have caused this?
> >
> > Best Regards,
> > Mark
> >
> >
> > Mar 21 10:28:37 OEI-RHLXSnort snort: [1:528:4] BAD-TRAFFIC loopback
>
> traffic
>
> > [Classification: Potentially Bad Traffic] [Priority: 2]:
> > {TCP} 127.0.0.1:80 -> 209.176.102.178:1043
> > Mar 21 10:28:37 OEI-RHLXSnort snort: [1:528:4] BAD-TRAFFIC loopback
>
> traffic
>
> > [Classification: Potentially Bad Traffic] [Priority: 2]:
> > {TCP} 127.0.0.1:80 -> 209.176.6.213:1713
> > Mar 21 10:28:37 OEI-RHLXSnort snort: [1:528:4] BAD-TRAFFIC loopback
>
> traffic
>
> > [Classification: Potentially Bad Traffic] [Priority: 2]:
> > {TCP} 127.0.0.1:80 -> 209.176.6.213:1713
> > Mar 21 10:28:37 OEI-RHLXSnort snort: [1:528:4] BAD-TRAFFIC loopback
>
> traffic
>
> > [Classification: Potentially Bad Traffic] [Priority: 2]:
> > {TCP} 127.0.0.1:80 -> 209.176.247.84:1704
> > Mar 21 10:28:37 OEI-RHLXSnort snort: FATAL ERROR: OpenLogFile() =>
> > mkdir(/var/log/snort/209.176.247.84) log directory: Too many link
> > s
> > Mar 21 10:28:37 OEI-RHLXSnort kernel: device eth0 left promiscuous mode
> >
> >
> >
> >
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