. This archive combines the snort-announce, snort-devel, snort-users, and snort-sigs lists.
Re: [Emerging-Sigs] TCP Portals: The Handshake's a Lie!
Frank Knobbe (Nov 24)
That should help the Snort crew to narrow things down... unless it's
decided that it's not a problem. And I'm glad to hear that flow: works
properly. Thanks for testing!
-Frank
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Re: [Emerging-Sigs] TCP Portals: The Handshake's a Lie!
Frank Knobbe (Nov 24)
/me nods
Well, if ipA:80->ipB:7627 is in response to ipB:7627 sending a SYN to
ipA:80, then it would be correct. Note that the SYN doesn't establish
the sessions. You still require an ACK from both sides.
Well, I'm glad you learned something ;)
I know you know this. It was for the benefit of other readers. I'd like
to flesh things out so other can visualize what's happening to remain on
"the same page".
I'm not aware of other...
Re: host attribute file question
Steven Sturges (Nov 24)
As a side note, you might try the profile 'all' in that
scenario. It really comes down to how the servers handle
spaces/tabs and other things in the request.
-s
Jason Wallace wrote:
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Re: host attribute file question
Steven Sturges (Nov 24)
Hi Jason--
No, currently, the client & service application and version attributes
are still ignored.
Thats an interesting configuration you have... I'll add an enhancement
request to our queue. Not sure of the impact of adding it, so
no promises on a time frame.
Cheers.
-steve
Jason Wallace wrote:
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Re: [Emerging-Sigs] TCP Portals: The Handshake's a Lie!
Jason Brvenik (Nov 24)
/me thinks if that were the case they would be having problems today.
my though here is not what should be happening but if a poorly
designed / implemented system in an effort to accommodate this valid
behavior might well let ip:80 -> ip:7627 establish a session much like
a poorly implemented system that doesn't recognize
SYN/[PSH,URG,ETC...] can establish state with some stacks.
thanks for the education in flow handling, it was not clear to...
host attribute file question
Jason Wallace (Nov 24)
I sent this to the snort-users list, and was asked to send it the
devel list also. Any help would be appreciated.
Per the docs...
With Snort 2.8.1, for a given host entry, the stream and IP frag
information are both used. Of the service
attributes, only the IP protocol (tcp, udp, etc), port, and protocol
(http, ssh, etc) are used. The application
and version for a given service attribute, and any client attributes
are ignored. They will be used...
Re: [Emerging-Sigs] TCP Portals: The Handshake's a Lie!
Frank Knobbe (Nov 24)
Or systems that run 30 year old TCP stacks :)
Nope, that's a different issue. Scanning with source port set to 20 can
bypass lame firewalls. Not just stateless firewall, but I've even sailed
past a Checkpoint that had the FTP proxy thingy misconfigured.
Keep in mind that the SYN from the server to the client uses the IP:port
pairs on both sides of the packet. The only difference is that the ACK
flag is not set and it doesn't include the...
Re: Unixsock plugin?
Honia A (Nov 24)
Hi Dirk,
Thanks much for your reply, I really appreciate it.
1) I checked the log directory and the file called snort_alert already exists in there (/var/log/snort).
2) I have a script which is supposed to do the same thing, could you please have a look at it and see if it's any good?
3) You said "After this you can read from "sock" when snort writes to it". would you please tell me how could I do this?
Thanks so much,...
host attribute file question
Jason Wallace (Nov 24)
Per the docs...
With Snort 2.8.1, for a given host entry, the stream and IP frag
information are both used. Of the service
attributes, only the IP protocol (tcp, udp, etc), port, and protocol
(http, ssh, etc) are used. The application
and version for a given service attribute, and any client attributes
are ignored. They will be used in a future
release.
Is the application and version still not used? I'd like to define the
application in the...
Re: Unixsock plugin?
Dirk Geschke (Nov 24)
Hi Honia,
no, in this case it does not matter: Both do the same...
But if you define "output alert_unixsock" in snort.conf there is no
need to use "-A unsock", too.
Simply write a script/program that creates the unix domain socket
and read from it. That's all.
The socket should be in the log dir and called snort_alert.
All you need is something like this:
---
/* get a socket */
sock = socket(PF_UNIX, SOCK_DGRAM, 0) ;
/*...
Re: Fwd: Snort 2.7.0 segfaults on Ubuntu Server 9.04
Jason Wallace (Nov 24)
"Snort is installed from apt repositories, version 2.7.0."
You really need to get to the latest version. If you are using the
current version of the dependencies and a very outdated version of
snort, you are probably going to have these types of problems. If you
(or your friend) don't want to maintain a package from source and your
distro is out dated...switch distros....
Re: Unixsock plugin?
Honia A (Nov 24)
Thanks Dirk,
1) Currently I have the line "output alert_unixsock" added to my snort.conf file and this is the command I run: "snort
-A unsock -c snort.conf ". Did you mean I have to delete the line from the snort.conf file and just run the command
itself?
2) You said I have to provide the unix domain socket so that snort can write to it, how can I do that?
Thanks again for your help,
Honia...
Re: Fwd: Snort 2.7.0 segfaults on Ubuntu Server 9.04
Joel Esler (Nov 24)
On Tue, Nov 24, 2009 at 6:42 AM, Igor Zinovik <zinovik.igor () gmail com>wrote:
Darn,
That was the first thing I was going to tell you to do. Troubleshooting an
old version like 2.7.0 is rather consuming for the list, since, we may have
fixed the problem in a newer version. I understand your partners dilemma
about not wanting to maintain the package separately, but in this case, it's
necessary.
J
Re: Question about snort inline
fathi.engineer (Nov 24)
Hi,
It wouldn't be possible to block unwanted hosts if you don't modify the iptables rules on Linux.
Short answer: yes.
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Fwd: Snort 2.7.0 segfaults on Ubuntu Server 9.04
Igor Zinovik (Nov 24)
Hello, snort-users@ readers.
We are trying to deploy snort 2.7.0 in our network, but currently with
no luck. We have ordinary i386 box (Celeron 2.0 Mhz with 512 MB DRAM)
with 2 NIC: Intel 1Gb NIC and Realtek 100Mb NIC.
Software we use:
Snort is installed from apt repositories, version 2.7.0. It has
compiled in mysql and prelude support.
Barnyard2 v1.6.
Linux kernel v2.6.28-15.
MySQL v5.1.
libmysqlclient16 v5.1
We also deployed snorby...