Wednesday, February 27, 2013

Important note for those monitoring multiple interfaces with Bro

An issue was recently discovered in Bro 2.1 when monitoring multiple interfaces with PF_RING that could result in traffic loss.  This issue is targeted for resolution in Bro 2.2.

UPDATE 2013/05/13 - A new Setup package is now available which automatically disables Bro's PF_RING load balancing when multiple interfaces are being monitored:

If you've already run Setup and selected multiple interfaces to monitor, please disable Bro's PF_RING load balancing as follows:
sudo broctl stop
sudo sed -i 's|^lb_method=pf_ring|#lb_method=pf_ring|g' /opt/bro/etc/node.cfg
sudo sed -i 's|^lb_procs|#lb_procs|g' /opt/bro/etc/node.cfg
sudo broctl install && sudo broctl start
For more information on the Bro issue, please see Bro Ticket #943.

New NSM scripts package now available!

I've updated our NSM scripts to resolve the following issues:

Issue 292: Need cronjob to reload syslog-ng at midnight
Issue 295: Increase sleep value in /etc/init/securityonion.conf
Issue 296: Run snort as non-root user
Issue 297: Run snort/suricata with unique PF_RING cluster-id per interface

Thanks to the following for testing this update!
Matt Gregory
Heine Lysemose
The new NSM scripts package is now available in our stable repo. You can initiate the update process using the graphical Update Manager or with the following one-liner:
sudo apt-get update && sudo apt-get dist-upgrade
Reminder about MySQL Updates
As a reminder, if you are prompted to install MySQL updates, please see the following for the recommended procedure for updating MySQL:

If you have any questions or problems, please join our mailing list and ask away!

Thursday, February 21, 2013

Seth Hall's Bro Module for APT1 Detection

Seth Hall wrote a great Bro module based on the recent Mandiant APT1 report.  Here are some quick instructions for loading the module on a Security Onion sensor.

UPDATE 2013/12/11 - These scripts are for Bro 2.1 only.  We've released Bro 2.2 and included an updated version of the APT1 scripts written for Bro 2.2.  Please see:

sudo apt-get install -y git
cd /opt/bro/share/bro/site/
sudo git clone git:// apt1
echo "@load apt1" | sudo tee -a local.bro
sudo broctl install && sudo broctl restart