Questions tagged [ids]

An intrusion detection system (IDS) is a device or software application that monitors network and/or system activities for malicious activities or policy violations and produces reports to a Management Station.

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22 views

IDS / IPS needed?

Background: We currently have have our corporate environment at AWS with mail and file server being severed up at O365/Sharepoint. We have no-onprem servers. We currently have the ISP provided router/...
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35 views

What is uid in snort means

I was writing a snort rule for the specific exploit and then came across one solution that details as "uid=0(root)". Can someone explain what is that and why it is mentioned in order to ...
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722 views

IDS/IPS on Ubiquiti EdgeRouter

I have changed my network setup from the default ISP device to an Ubiquiti EdgeRouter (ER-X-SFP) a while ago. Currently I’m planing to switch to an static IPv4 address. From the ISP I would also get ...
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87 views

Auditd to CloudwatchLogs to IDS alerts?

I'm administering a relatively simple AWS stack with about 5 heterogeneous Linux EC2 instances. All instances already have been setup to ship important logs to Cloudwatch Logs. Now I want to setup a ...
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30 views

HIDS: Need a trip wire for a honeypot, best approach?

We run a small VPS hosting company, each vps is based on a fixed 18.04 template. We run a honeypot, a fallow server, to verify the template continues to be secure. We look at it probably once a month ...
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85 views

Is it possible to decapsulate ERSPAN and forward on RSPAN?

I am currently running into an issue where we are trying to send our network traffic from our physical infrastructure into a virtual Alienvualt appliance, but our switches are unable to send RSPAN ...
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53 views

Use Snort 2.9 rules for Snort 2.8.6

Unfortunately Snort doesn't release rules update 2.8.6 since 2017. All customer should upgrade to 2.9. But 2.9 is X64 and my OS is Fedora X86. I need to update my Snort 2.8.6 signatures. Is there any ...
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111 views

Suricata: Error opening file threshold.config

I use Suricata 4.0.5 (an open source IDPS) on windows server 2012. It raises the below error when I run it, however, it runs. Error opening file threshold.config I searched for this error and find ...
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1k views

Suricata logs “A Network Trojan was detected”. Is it false positive?

I use the Suricata as IDS on the local network that it doesn't the internet. It logged a few alerts from some clients that said A Network Trojan was detected. All log's properties are in the following:...
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1answer
595 views

Snort not sniffing any traffic except it's own

I'm currently trying to set up Snort on my local machine. At the moment I have 3 VM's: 1 with snort on it and 2 used to ping eachother. Whenever I ping from one of the devices to the Snort-machine, ...
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122 views

Many violations in Tripwire

I've installed Tripwire yesterday (I'm new to Tripwire) in my new VPS (created two days ago). I've followed the steps of this tutorial to setup Tripwire and all worked fine and my report doesn't had ...
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1answer
46 views

Tripwire skipping files?

TL;DR: Question: how do I configure Tripwire to watch EVERYTHING that is below a certain path? My current config seems to only be looking at certain files / directories in a given path instead of ...
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738 views

OSSEC - Not seeing alerts on the Server from file changes on the Agent

I have an OSSEC server and Agent installed and configured. I have imported the key to the Agent and they appear to be communicating. However, I am trying test the file integrity monitoring feature and ...
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1answer
67 views

How can ossec handle a virus that already spread into the deepest system? [closed]

As far as I know, OSSEC is a Open Source HIDS. It's a "Detection System". I read in journals, it collect logs and flag any anomaly that had been found in a system ( e.g. Debian Server ) and do some ...
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1answer
492 views

specify the order of IDS , Firewall , WAF

i have an ubuntu system and i want to implement iptables as firewall, modsecurity as WAF and snort as IDS in this system and i have a server behind this system and i want to protect the server with ...
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1answer
974 views

Can Suricata be used as an effective IPS on a single server?

I've been looking for an effective intrusion prevention system (IPS) for an Ubuntu 14.04 server, something like what Symantec or F-Prot might offer for a Windows server. I've contacted major ...
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1k views

Replaying pcap file for Snort

I currently have the following, presumably standard, setup: I have a physical server with Snort running. Snort logs into its log files as it should. Those files are tracked by barnyard2 which writes ...
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5k views

Snort rule for detecting DNS packets of type NULL

I am trying to detect DNS requests of type NULL using Snort. I located the type field of the request packet using Wireshark: I found the following rule on McAfee: alert udp any any -> any 53 (msg:...
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1k views

is there any real Difference between snort and suricata?

Looking to move forward in deploying IDS/IPS on several FreeBSD firewalls and I was curious about the difference between snort and suricata. I know that Suricata is multi-threaded but in terms of rule ...
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1answer
692 views

is there a way from iptables to forward all traffic to my IDS Suricata in a second interface?

Hello there, is there a way from iptables to forward all traffic to my IDS Suricata and also keep the regular flow, I have two interfaces and I did find how to do it with one interface.. example: -t ...
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1answer
705 views

Intrusion Detection/Prevention in AWS

On a normal server, I would have fail2ban handle intrusion detection; how would I go about setting up IDS/IPS on AWS? Any help or pointers would be appreciated.
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4k views

KVM bridge for promisc interface IDS

I have a KVM virtualization server which serves up a br0 bridge, mapped to eth0. I want to add eth2 as a bridge to br2 for a IDS virtual machine I'm testing, but the guest OS doesn't see either br2 or ...
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384 views

Fail2Ban WordPress filter not working on Debian VPS

I am having trouble getting WordPress Fail2Ban filter to work. I have installed the WP Fail2Ban plugin using the latest update which had a few changes, however, nothing is getting blocked. Here is a ...
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1answer
503 views

Fail2Ban login filter not working on Debian Web Server

So I am having issues getting Fail2Ban to work with as a custom filter for a web app login. First of all, other filter do work such as NGINX Auth. However, my emails have stopped working, not sure why ...
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395 views

How secure Google Compute Engine is?

We're moving to GCE and we want to know how secure it is. Do we need to install our own intrussion detection/prevention software on our VM Instances? (Tripware, Ossec, Snort). or does GCE handle ...
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2k views

Has anyone used any custom decoders with OSSEC?

I have the OSSEC HIDS software version 2.8.3 running on a RHEL 6 server. We have been testing this in the lab with a DNS server to track queries that come into our RPZ and Malware zones. The DNS ...
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1answer
635 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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1answer
262 views

Can I use same suricata instance for both IDS (for L3,4) and IPS (for L3,L4,L7)?

I have a interface where traffic is flowing from internet to NGINX server to application server. I want to monitor (IDS) the traffic flowing between Internet and NGINX at L3,4 and IPS the traffic ...
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313 views

Is the best place to put an IDS sensor before a webproxy or after it?

My IDS sensor is currently located after the webproxy and all I am seeing is heaps of packets originated from the Web Proxy to the remote destination IP addresses. Hence, I don't actually see who does ...
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1answer
847 views

Can IPS monitor both inbound and outbound traffic?

We have a user traffic flow like below (PC - Internet) PC => Cisco ASA FW+IPS integrated => Fortigate Proxy (ISP connected to this Proxy) = > Internet PC = > ASA+IPS ==> Fortigate Proxy ==> Internet....
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448 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
880 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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1k 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 /etc/...
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3answers
285 views

is there a PAM module for DNSBL lookups?

I have been enumerating the remaining security concerns on one of my back-end production servers, when I came to the realization that something which could be incredibly useful was missing from my ...
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2answers
203 views

Blocking geographic cities from accessing Asterisk using Secast

I am using Secast for intrusion protection on my Asterisk PBX. It’s working great, and I now want to start blocking specific geographic regions. My system is getting hammered from Ramallah ...
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623 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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1answer
47 views

How to filter errors 404 to show only those which are related to php files?

One of my web servers is getting flooded with requests to resources that do not exist anymore, generating the corresponding 404 error. As I'm using OSSEC and OSSIM, then these errors are sent to the ...
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1answer
781 views

Lean but effective linux IDS / IPS / WAF? [closed]

I'm looking for a lean but effective IDS/IDP/WAF solution for my tiny VPS webserver. Currently I already use iptables and psad but a lot of the web server scanning attempts slip through. I use ngingx ...
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4answers
1k views

Simple application level file integrity monitoring & Intrusion detection (IDS)

We've been searching for a simple file integrity monitoring solution on CentOS/Linux that will work on the application level. We are not looking for OS/network level IDS as OSSEC and the others do a ...
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1answer
778 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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2k 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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1answer
58 views

POLICY Mozilla Multiple Products HTML href shell attempt - SNORT

We've had a few of these alerts get triggered through Snort: "POLICY Mozilla Multiple Products HTML href shell attempt" I'm struggling to find any information pertaining to this alert, does anyone ...
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1answer
465 views

snort intrusion detection

Hi im trying to use snort as an IDS on some pcap files I have, I was hoping I would get a log of any intrusions. I know for a fact that there is port scans and ping sweeps etc in the pcap files but ...
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5k views

OSSEC large scale deployment

We have a data-center and as a happy OSSEC user I am trying to convince my management to use it for host intrusion detection. However I have never deployed it on more than a handful of servers and I ...
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1answer
409 views

Stateful Signatures in an IPS

I am researching in-line IPS devices and their signatures both stateful and stateless. The test network I am looking to implement the IPS in has asymmetric traffic so stateful inspection would be ...
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1answer
817 views

Webserver security, intrusion detection, and file intregrity

I would like to add some type of tracking / alerting on some linux webservers running PHP and Apache. In doing searches I have come across a lot of info from 2006-2009. Would like to revisit ...
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3answers
18k views

Blocking Team Viewer

I'd like to block incoming TeamViewer connections to my network, but at the same time to allow outgoing TeamViewer connections. So that users can't connect to their work PCs with TV (circumventing ...
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3answers
777 views

To what extent can you secure a system? [closed]

To what extent can you filter/firewall for suspicious traffic or lock down a system? If you have everything up to date and secure, what can you do to protect against a 0 day? I assume an IDS might ...
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3answers
1k views

Good Firewalling practice for internet facing servers?

Does it make sense to firewall an internet facing server, say a webserver? Assuming I did not want to restrict anyone from accessing the webserver in its capacity to serve web pages, I would be ...
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2answers
3k views

Is there an appliance-style distribution with web-based configuration for Snort? [closed]

There are some great "appliance" style distributions like pfSense and M0n0wall, that bundle powerful features of their respective operating systems with a nice web application for configuration. In my ...