zeek October 2013

zeek@lists.zeek.org

46 participants
44 discussions

by Champion,Jerry

I am getting a Dependency is not satisfiable: libc6(<2.12) error message. [cid:image001.png@01CE5875.C815C190] I have run the required dependency: sudo apt-get install cmake make gcc g++ flex bison libpcap-dev libssl-dev python-dev swig zlib1g-dev libmagic-dev But I have version 2.17 [cid:image002.png@01CE5875.C815C190] Can someone assist me with this? VR Jerry Champion Information Secuity Engineer Synovus Financial Corp 706-644-4589

7 years, 11 months

[Bro] Bro problem - no software.log written

by עומר עומר

8 years, 4 months

[Bro] Additional Records in DNS

by Chris Crawford

I'm trying to write a bro script that pulls out authoritative nameservers and additional records from DNS. I think I need the the dns_EDNS_addl event to get at that part of a DNS reply, since the dns_edns_additional structure seems like it has the information I'm looking for: http://trac.bro-ids.org/sphinx-git/scripts/base/init-bare.html#type-dns_edn… Unfortunately, it looks like dns_EDNS_addl isn't implemented yet: # scripts/base/protocols/dns/main.bro 318 # TODO: figure out how to handle these 324 #event dns_EDNS_addl(c: connection, msg: dns_msg, ans: dns_edns_additional) Has anyone worked out a way to grab this information from a DNS reply? If not, could anyone point me in the right direction so that I can roll my own solution? -Chris

8 years, 4 months

[Bro] Broctl pf_ring_DNA support / Bro at 100G

by Gary Faulkner

Hello, We recently lit up a 100G link and are attempting to tackle migrating our IDS and monitoring infrastructure from 10G to 100G capabilities. We have an existing set of servers that we are are using to evaluate SNORT, Suricata and Bro on with a 100G Gigamon upstream. For purposes of a Bro proof of concept I have two of the following Dell 720s to start from: Dell 720XD 64 G RAM (1600 MHz RDIMMS) 30TB (usable) RAID 6 7.2K RPM SAS 6Gbps 2 146GB 15K RPM SAS 6Gbps 2 Intel Xeon E5-2670 2.60GHz, 20M Cache, 8.0GT/s QPI, Turbo, 8C 3 Intel X520 DP 10Gb DA/SFP+ I'm starting from build 2.2-beta-114 and looking at using it and PF_RING with the DNA drivers for the Intel cards for now as some of the other popular cards are "complicated" for us to get approval to purchase. I haven't found much info on running Bro this way other than issue ID 845 <https://bro-tracker.atlassian.net/browse/BIT-845> and even that only suggests that there is a Bro Control plugin in the works for this, but that it may not be fully tested yet. Has anyone tried the plugin yet or have any experience configuring Bro and PF_RING/DNA to work together? Regards, -- Gary Faulkner UW Madison Office of Campus Information Security 608-262-8591

8 years, 7 months

[Bro] pf_ring on RHEL/CENTOS 6?

by Matt Stucky

I've set up a Bro 2.1 instance with a network tap, but keep getting notice log entries of "PacketFilter::Dropped_Packets". I'm assuming this is because Bro is single threaded and it needs more workers to keep up with the traffic, so I'm trying to implement pf_ring to distribute the traffic across multiple workers. I've installed the pf_ring RPM package from ntop ( http://www.nmon.net/packages/rpm/x86_64/PF_RING/) and that gets the kernel module loaded but seems to be lacking something still - probably linking libpcap to pf_ring? That's what I'm not sure about. After installing pf_ring from the RPM package and configuring Bro for multiple workers it starts up ok but is still dropping packets (all of the workers, per the notice log) and pf_ring doesn't appear to be used: # cat /proc/net/pf_ring/info PF_RING Version : 5.6.2 ($Revision: 6910$) Total rings : 0 Standard (non DNA) Options Ring slots : 4096 Slot version : 15 Capture TX : No [RX only] IP Defragment : No Socket Mode : Standard Transparent mode : Yes [mode 0] Total plugins : 0 Cluster Fragment Queue : 0 Cluster Fragment Discard : 0 Has anyone had any success with clustered Bro with pf_ring on RHEL/CENTOS, and did you have to compile it from source and re-compile libpcap? I'd prefer to stick with the RPM packages since it tends to make updating less problematic. I installed Bro 2.1 as an RPM package as well. Thanks, Matt

8 years, 7 months

[Bro] BRO conn.log - connection flow direction wrong - non standard telnet port connection

by Konrad Weglowski

Hello, I am pretty new user of BRO and use it as a part of the Security Onion distributions. I currently came across a problem which I was hoping one of you might be able to help with. When looking at some telnet connections on a non-standard TCP port I noticed that some data flows are reported in the wrong direction. When checked the conn.log files, all the entries in question had the same characteristics below: 1. They would only appear in the archive (gzip) conn.*.log.zip files - not the current conn.log file. 2. Entries would always be at the beginning of the zipped conn.*.log.zip file 3. Conn_State field would say RSTR 4. History field would be DaFr (on most of them) Below are some examples, as you can see the file name reflects from/to date/time, and the characteristics of the entries in question where flow direction is reversed are below: zcat conn.16:27:17-17:00:00.log.gz | bro-cut -d ts proto conn_state history | grep RSTR 2013-10-25T16:27:12+0000 tcp RSTR DaFr 2013-10-25T16:27:12+0000 tcp RSTR DaFr 2013-10-25T16:27:12+0000 tcp RSTR DaFr <snip> zcat conn.18:36:28-19:00:00.log.gz | bro-cut -d ts proto conn_state history | grep RSTR 2013-10-25T18:36:23+0000 tcp RSTR DaFr 2013-10-25T18:36:23+0000 tcp RSTR DaFr 2013-10-25T18:36:23+0000 tcp RSTR DaFr <snip> zcat conn.18:36:28-19:00:00.log.gz | bro-cut -d ts proto conn_state history | grep RSTR 2013-10-25T18:36:23+0000 tcp RSTR DaFr 2013-10-25T18:36:23+0000 tcp RSTR DaFr 2013-10-25T18:36:23+0000 tcp RSTR DaFr <snip> It almost seems that when conn.log file is being divided up and zipped this happens. Just to give some context, we have a script running which telnets to multiple devices and polls certain variables and exits on a non-standard telnet ports. Thanks, Konrad _____ No virus found in this message. Checked by AVG - www.avg.com Version: 2014.0.4158 / Virus Database: 3615/6790 - Release Date: 10/29/13

8 years, 7 months

[Bro] Cluster setup

by hiren panchasara

Hi All, Here is what I am trying to achieve: Incoming traffic on Host-A should be sent to worker Host-B (and to more workers in future). Here is how my config looks like in node.cfg Manager: Host-A Proxy: Host-A Worker1: Host-B (which is 10.73.149.31) I have bro installed on all machines. Now, I start broctl on Host-A: -bash-4.2$ sudo broctl Password: Welcome to BroControl 1.1 Type "help" for help. [BroControl] > install removing old policies in /usr/local/spool/installed-scripts-do-not-touch/site ... done. removing old policies in /usr/local/spool/installed-scripts-do-not-touch/auto ... done. creating policy directories ... done. installing site policies ... done. generating cluster-layout.bro ... done. generating local-networks.bro ... done. generating broctl-config.bro ... done. updating nodes ... warning: host 10.73.149.31 is not alive done. [BroControl] > install removing old policies in /usr/local/spool/installed-scripts-do-not-touch/site ... done. removing old policies in /usr/local/spool/installed-scripts-do-not-touch/auto ... done. creating policy directories ... done. installing site policies ... done. generating cluster-layout.bro ... done. generating local-networks.bro ... done. generating broctl-config.bro ... done. updating nodes ... done. [BroControl] > start starting manager ... starting proxy-1 ... starting worker-1 ... cannot create working directory for worker-1 <<-- not sure why I get this message. [BroControl] > Do I need to do anything on Worker-1?? Do I need to put it in some special mode? Any help/pointers would be appreciated. Cheers, Hiren

8 years, 8 months

[Bro] Bro install on new machine - SSH logging broken

by Nicholas Siow

Hello all, We recently did a fresh install of Bro 2.1 on a new machine as per the quick start guide. This machine has been watching traffic for about a week now and all of the logs seem to be fine except for the SSH logs, which have the following problems. 1) These logs are not adding geo-location information. The MaxMind databases were installed and put in the proper location, and a quick bro script that called the lookup_location() function seems to be working fine in retrieving this information. However, none of this information is logged, even for heuristically successful connections. 2) About half of the entries in the SSH log have a status of "undetermined". This is not something we saw before on our older machine, where every entry was listed as either a 'success' or 'failure' in the status column. 3) The "resp_size" field of *every* entry is 0. Once again, this is not something that we have seen before. I should also mention that we have an older machine watching the exactly same network as this one (though with a smaller network card) and that one seems to be picking up on SSH traffic fine. Any idea what's going on here? Thank you, N. Siow

8 years, 8 months

[Bro] Dump Connections to File

by anthony kasza

Does anyone know if it is possible to dump all the packets associated with a specific connection to a file? It would be nice to be able to check during connection_state_remove if a connection was interesting or not and write it to disk. -AK

8 years, 8 months

Re: [Bro] Question regarding an error

by Justin Azoff

On Wed, Oct 30, 2013 at 08:08:58PM +0000, Rosebraugh, Connar wrote: > type ConnDelta: record{ > #time connection was last seen. > #consider updating to a set, and taking the stdev of the times > lastSeen: time; > delta: interval; > }; > > function update_time(t: time, c: ConnDelta): interval > { > c$delta = c$lastSeen - t; > c$lastSeen = t; > } > > #event bro_init() > #{ > # local t1 = current_time(); > # local t2 = network_time(); > # local t3: interval = t1 - t2; > # > # print t1; > # print t2; > # print t3; > #} > > local connection_deltas: table[addr, addr, port] of ConnDelta; This needs to be 'global' not 'local'. Possibly a parser bug that it doesn't return a more helpful error message since it clearly gets confused. > @load base/protocols/conn > > #event new_connection(c: connection) > event new_connection(c: connection) > { > update_time(c$start_time, connection_deltas[c$id$orig_h, c$id$resp_h, c$id$resp_p]); > } The next problem you will run into is that you need to set &default for connection_deltas that returns a default ConnDelta object for the first time that this tuple is seen. > event bro_done() > { > #print connection_deltas; > } > -- -- Justin Azoff -- Network Security & Performance Analyst

8 years, 8 months

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zeek October 2013