Snort is a software package used for network intrusion detection.

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PFSense / Snort / OpenVPN - one WAN interface

I have a pfsense box running both Snort and OpenVPN. The VPN worked great before installing Snort, now intermittently I cannot connect. Should I whitelist the port that the VPN uses on the WAN ...
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13 views

Deploying latest snort release with ansible

I'm like to be able to automatically deploy snort with ansible, but snort removes old RPMs when new ones are released so I have to adjust my playbook with each new release. I'd really like to be ...
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21 views

SNORT: Is a PCRE on SSNs intensive

I'm trying to write a Snort rule to look for SSNs. Due to the limitations of the appliance in place I can not use the pre-processor settings. How intense would it be to run a PCRE rule for SSNs? ...
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16 views

How to use Snort generate packet logs when in the NIDS mode?

I am using Snort act like a network IDS by implementing snort configuration file and snort rules, I also want to capture all the packets (traffic) going through the specific network interface. My ...
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2answers
30 views

How can I put snort in front of nginx server

I want to prevent attacks to my nginx server. How can I proxy the requests through snort to nginx server. NFQueue's are a solution.I am able to pass packets to snort using the following rules sudo ...
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238 views

Trouble Starting Snorby / Ruby dependency issue

I am trying to install Snorby on a CentOS 6.6 machine and keep getting an issue with ruby and my Gemfile. I believe I either have to edit my Gemfile or it has something to do with an installation ...
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52 views

Snort IDS on HAproxy with encrypted traffic

Using HAproxy, can I direct traffic to a backend server from all the other backend servers in a pool? From a networking standpoint, it would be comparable to mirroring all ports on a switch to one ...
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16 views

snort rule: SENSITIVE-DATA Email Addresses

I already asked this on the snort-users mailinglist but seemingly the question is ignored there. So maybe with some snort preprocessors can help me here. I get alot of false positives when browsing ...
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138 views

How do iptables work with NFQ in terms of traffic shaping in snort?

I'm trying to understand how iptables and NFQ work together with snort. The reason that I ask this is because from what I understand snort can be set to IPS via NFQ but if you have iptables there ...
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130 views

How do you get Snorby to generate an alert through a custom rule?

I am having trouble getting a rule to activate, when a syn flood attack is happening. I have tried 2 iterations of this code and I am losing my sanity over it. The scenario is that I have 3 VMware ...
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45 views

Snort sniffing WPA1/2 protected network with mon0 (=wlan0; set into monitor-mode)?

How do I configure Snort to sniff a WPA2-protected network using mon0 (= wlan0; set into monitor-mode). Of course, I have the SSID, the WPA-PSK and channel of the wifi-network I want to monitor with ...
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1k views

snort: drop icmp rule doesn't actually drop packets

I installed snort-2.9.7 from sources, and launch as IDS: % snort -devQ -A console -c /etc/snort/snort.conf -i eth0:eth1 Enabling inline operation Running in IDS mode ... The config file is very ...
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379 views

snort complains on local.rules

I just installed snort-2.9.7.0 on Fedora 20, and am getting error when running: % snort -c /etc/snort/snort.conf --dump-dynamic-rules=/tmp Running in Rule Dump mode --== Initializing Snort ...
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33 views

Windows server, snort connecting using rpcap

I'm trying to run snort in windows, but instead of using -i eth0, can i use remote (rpcap). I'm using windows 7 in vmware Here is the command I run: c:\Snort\bin>snort -c c:\Snort\etc\snort.conf ...
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88 views

Snort even though working properly does not report majority of rules

I have installed Snort 2.9.7.0 and it does not detect majority of attacks, such as nmap port scans, downloading exe files, opening documents containing keyword "root". I use Snort together with ...
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41 views

SNORT only alerting on inbound traffic

I am trying to raise an alert when someone is setting up a connection to PORT 25 (tcp), whatever source or destination. For this i came up with this simple rule: alert tcp any any -> any 25 ...
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1k views

Snort: Unable to open rules file

This is my first with snort. And I can't get it to run. I followed this tutorial exactly. And I have fedora 21. Here's the output from snort -c /etc/snort/snort.conf -v -i enp0s3: Running in IDS ...
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62 views

is there a way from iptables/iproute to forward all traffic to my IDS and also keep the regular flow

The reason of this, is that to catch all packages into my IDS keeping my existing enviroment, so the IDS does not become a single point of failure. If route all my traffic into my IDS and from my IDS ...
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1answer
191 views

VirtualBox Networking Lab Configuration [closed]

I'm creating a lab for a project that will test a network security defense product's effectiveness in detecting various attacks. I have a physical server with 32GB of RAM and VirtualBox to create the ...
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1answer
138 views

Snort in KVM machines

I have installed two physical machines with KVM virtualization using Red hat as OS ( h1 and h2). In h1 I have installed the virtual machines w1 and db1 and in h2 the virtual machines w2 , db1 and ids. ...
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promisc mode doesnt work - better solution?

I have a Debian Wheezy server running snort with two network cards: eth0 and eth1. Eth0 is used to recieve a packet stream to inspect by snort - while eth1 is used by the admin to connect to the ...
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317 views

How can I run a shell script on a snort alert?

I have snort listening to the SPAN port of a cisco switch. I'd like to be able to add an iptables DROP rule on my webserver for specific snort alerts but having a hard time finding out exactly how to ...
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408 views

Barnyard2 error on start

Been setting up a snort box with barnyard2, run into the error below. Can someone please help? $Starting Snort Output Processor (barnyard2): ./barnyard2: 35: ./barnyard2: barnyard2: not found ...
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142 views

Running snort behind iptables

I run a Centos 6.5 server with a highly restrictive iptables ruleset allowing incoming traffic only on a small handful of tcp ports (8 in total) and blocks all incoming unsolicited UDP traffic. I ...
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1answer
2k views

Snort not sending alert log file to syslog server?

I am set up with three virtual machines running Ubuntu - a Server, Client, and Gateway. I am tasked with setting up Snort on the Gateway to monitor "attacks" from the Client to the Server. Snort is ...
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83 views

Windows Snort remote MSSQL

I have to setup snort on a Windows 2012 machine. Snort works fine. However, I am supposed to write all logs to a Microsoft Database Server 2012 on a different VM. However, at the moment I cannot ...
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571 views

setting up snort 2.9.x with barnyard2

These how to guides on the interent are outdated also the software it is relying on is not up to date with PHP5.5. I have done some hacks with ACID and ADODB to make part sof the gui to work. I have ...
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249 views

flowbits in snort added because of quality standard

I'm having trouble reading a rule. Specifically, where is a flowbits GROUP_NAME defined? I was reviewing my squert screens from securityonion and noticed the following: 3618 ET TROJAN Backdoor ...
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163 views

configure frag3 in SNORT

i m trying to test IDS systems on evasion. I have picked up Snort IDS. I have crafted few fragmented packet scenario, and i m sending those fragmented packet to destination address. All these crafted ...
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2k views

Why do my Snort logs appear to be empty?

So I was following this guide on how to install Snort, Barnyard 2 and the like. I've set up Snort so it would run automatically, by editing the rc.local file: ifconfig eth1 up ...
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417 views

Running Snort on Hyper-V

After spinning up a VM for Snort (actually BT5..) and starting snort, I'm getting numerous "SNMP Public Access udp [**] [Classification: Attempted Information Leak] [Priority: 2] {UDP} ...
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125 views

Snort logging mode - How to define subnets

I am using snort to log all traffic on an interface snort -i eth1 -l /interface/log/dir -b -U -m 112 With this command I manage to get ALL data which makes my log files very large. Is there any ...
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63 views

Can IPtables (possibly with libnetfilter_queue library) do everything that snort does?

I have just started getting into network security, firewall, etc. So, please excuse me for asking this basic question. I looked at IPtables and got a good hang of it (nowhere close to becoming an ...
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176 views

How do I set Securityonion/snort to not capture certain packets?

After looking through my pcaps from Security onion I'd like to filter out a host (let's call it 192.168.4.4) and filter out some traffic (ports 80 & 443), current project is to look at other ...
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3answers
712 views

Snort not detecting outgoing traffic

I'm using Snort 2.9 on windows server 2008 R2 x64, with a very simple configuration that goes like this: # Entire content of Snort.conf: alert tcp any any -> any any (sid:5000000; ...
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410 views

Snort, Portscans and Scanned IP Range field

According to manual.snort.org, TCP Portscans goes from one computer to other one, but when you take a look to an tcp portscan alert in snort/snorby you can see this: In one hand: Source: ...
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1answer
149 views

Snort configuration

I'm trying to configure Snort on a security probe and I am having an error: FATAL ERROR: database: mysql_error: Can't connect on MYSQL server on "x" (111). I have set up the account with privileges ...
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852 views

Should I Install Snort on my web server? [closed]

I've been thinking about installing snort on my dedicated server. I got about 100 domains/clients. What should I be considering here for pros and cons? Memory usage, bandwidth impact?
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22 views

Monitor a machine plugged on a mirroring interface

I've read that if I configure port span, I can no longer use that interface to pass normal trafic. However, I'd like to monitor the machine plugged to that interface, with nagios.. Does anyone know ...
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702 views

How to properly drop ICMP type 3 packets on possible DDoS attack?

Even after running iptables -A INPUT -p icmp -m icmp --icmp-type 3 -j DROP I keep getting ICMP type 3 code 13 packets on tcpdump. when I run tcpdump icmp, I get messages like: 19:41:31.923630 IP ...
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558 views

OSSIM Alarms for Snort rules

I'm new to OSSIM. My requirement is to detect executable files (.exe) using snort. I have found a snort rule: alert tcp any any -> any any (msg: "DLL Windows file download"; flow: established; ...
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1k views

pfSense and Snort: unexpected portscan traffic on interface

I have a pfSense box acting as my public facing router and stateful firewall. There is 1 WAN interface and several LAN interfaces using private IPs behind NAT. I EXPECT to see portscans or all kinds ...
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3answers
1k views

Snort Based Firewall

I have not worked with SNORT much or done too much research on this but it sounds possible. If I setup a server and run snort on it. Would it then be possible to route ALL my traffic through it like ...
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183 views

Using Snort without a port mirrored switch

I am trying to set up a Snort IDS on a virtual machine for my lab. My problem is that normally, these kinds of IDS are connected to the mirrored port of a switch. My lab has no such device. Here is my ...
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178 views

What class of software should I use to intercept HTTP requests and perform an action

We have inherited an old Web application that needs to be extended with some logging capacities for compliance purposes. Unfortunately, we can't change the application. The application receives XML ...
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147 views

Is Snort able to efficiently demux and log large HTTP POST requests?

I'm trying to debug some failed HTTP POST requests containing large file uploads (~500 MB). The end-user is receiving strange HTTP responses that are not being logged in either varnish's varnishncsa ...
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253 views

Snort/Barnyard2-1.10 LOG_SYSLOG_FULL Output Logging

With log_syslog_full opertion mode set to complete you get the below output. Can some explain to me what the bold parts are? I have been searching and cannot find any documention explaining the new ...
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660 views

how can a mirror all of the traffic on a network interface, to virtual interface

I am trying to setup snort to act as an ids, on a debian machine that also functions as a router. Ideally I would like to setup snort in such a way so that I would not have to purchase an additional ...
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170 views

Configuring Barnyard2 Output Plug-In Per Input Source

I am currently using snort-2.9.3.1 outputting unified2 log format and using barnyard2-1.9 to process the alerts and send them to both syslog and a database. In some cases I have multiple instances of ...
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502 views

Ubuntu 12.04 Server snort 2.9.2.3 not logging NMAP Scans after first VTR Rules update

I install snort 2.9.2.3 from the Ubuntu repositories along with Oinkmaster. I'm not running LAMP just snort for logging pcap and to the alert log file. Out of the box installation snort worked. ...