Concerned with software or hardware firewalls

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2
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2answers
130 views

I am not connecting to internet, do I still need the windows firewall on?

Forgive my ignorance but I am truly uncertain. Here is my situation: I have dual booted a Linux distro and Windows 7 on my machine. Windows 7 sole purpose is for gaming, that's all. I'm not planning ...
1
vote
2answers
227 views

What are the security implications of allowing all incoming connections in a firewall on a typical Windows server?

Say I have a Windows Server (let's go with Windows Server 2012, but I'm thinking in general). It's running IIS. We have our standard website, accessible via port 80 (HTTP) and 443 (HTTPS). And let's ...
1
vote
1answer
45 views

What is the procedure to implement security zones in a production network without impacting negatively in the communications?

In an organization where there exist a network with VLANs where the communication between all VLANs is allowed we are going to install a firewall and define security zones. The security zones will ...
1
vote
1answer
136 views

How effective are firewall rate limiting rules for slowing down brute force and DOS attacks?

I am investigating methods to slow down the rate at which attackers can make brute force attempts against my webserver's SSH and HTTP services. I have come across many articles as well as the iptables-...
3
votes
1answer
63 views

Firewall - Allow WMI internal network

I am not totally sure if this is the correct stackexchange to place this question, so just let me know if it should be somewhere else. I am looking into IT asset management systems and for these ...
0
votes
1answer
102 views

Detect HTTPS self signed certificate in (DPI) firewall

TL;DR : Can a DPI firewall detect HTTPS connections that use a self-signed certificate? If so, how? A DPI firewall that should not allow VPN connections. The firewall blocks all VPN ports by default ...
-1
votes
1answer
139 views

Is it okay to have a blank root password for MySQL if port 3306 is not forwarded?

I'm running a PHP server that will use the root account to access the database. However, the server is behind a router and port 3306 is not port forwarded. Is it okay to have a blank password for the ...
1
vote
2answers
212 views

Is Linux getting less or more secure? [closed]

The famous so-called virus-and-hacker-free Mac is a thing of the past: As it gets more popular it gets more vulnerabilities. Will Linux be the same at some point in time? Is it getting less of more ...
1
vote
1answer
85 views

Debian 8 and few questions about Graphical Firewall?

I have installed Debian 8 today, and so far so good. What I want to achieve now is to install firewall but can't find Firestarter in repos (discontinued ?). So, I have installed a GUFW and set it up. ...
2
votes
3answers
127 views

Linux File Security when connected to internet [closed]

Let me first admit that I am a nobody in computer security - I just know the various threats generally known to public. I have a Linux Cent OS 7 installed on my computer which is connected to the ...
4
votes
1answer
359 views

Can a Cisco ASA 5505 block this DDoS attack?

Since more than a week ago, my dedicated server (located at ovh.com) has been under TCP SYN (I think) attack. OVH don't care about it but this attack is killing my server with a high CPU load (...
2
votes
1answer
104 views

Can in a VPN LAN-to-LAN one site be completely isolated from the other?

In a VPN LAN-to-LAN setting, is it possible to isolate one site from the other? I know that we can use a firewall but that would obligate us to manage specific rules in the firewall. I would like to ...
1
vote
1answer
69 views

SSL certs signed by different CA

Have a question on SSL certs signed by different CA. in the past, my web server cert is signed with CA1 and it was also imported into the web app firewall for SSL traffic monitoring. Now, I have ...
3
votes
2answers
119 views

How to restrict access to the internet for some computers on the network?

I’d like to differentiate machines (or, possibly, users) on my small business network so that only some of them have access to the internet. The solution I’ve been using to this day is quite terrible: ...
3
votes
2answers
130 views

Reverse Proxy or direct?

imagine I have an architecture as shown. In order to get to the internal web server, should I use a reverse proxy like as shown and redirect traffic to my web server? Is this a more secure way ...
1
vote
0answers
48 views

The process of using Metasploit to get in Systems [closed]

I am new in metasploit. I get the basic concept of exploiting a system or whatever your trying to do. You find a vulnerability in a system, you use an exploit or make one. Doing that on your local ...
8
votes
1answer
397 views

Vulnerabilities of pure NAT without firewall

Following some of the comments on this question, I was curious about the security vulnerabilities of NAT. There are similar threads here and here but they discuss router vulnerabilities rather than ...
1
vote
1answer
74 views

Find out what process is trying to initiate a connection in Windows

I'm not trying to find established TCP connections. I have a Windows 2008 R2 server and my host-based L3 firewall is showing one TCP connection ATTEMPT to a remote address. The connection is not ...
1
vote
1answer
131 views

Some questions about port-scans

I have two questions and it seems like this website is the perfect place to ask them. I read a post earlier concerning port scans and one of the answers stated something along the lines of: "There ...
3
votes
2answers
174 views

Should I block outbound TCP RST (on closed ports)?

I have a range of inbound TCP ports open on the firewall, but usually closed on the host machine. I see a handful of unknown connection attempts each day, for which the server returns TCP RST. I ...
1
vote
2answers
99 views

A couple of questions about port scanning

I have alot of questions on my mind right now, but I'll only ask the ones that are particularily intriguing me. First off: - I port-scanned my Public IPV4 address; and it returned a few ports being '...
2
votes
1answer
115 views

Check Point SSL Certificate Interception [duplicate]

Can someone please explain how Check Point enterprise firewalls are able to read SSL traffic? My boss briefly explained that our company's firewall, which is Check Point, is able to intercept SSL ...
1
vote
0answers
41 views

Is it possible to block a debugger from connecting locally?

I work at an enterprise with enterprise-type software on my machine regarding firewalls, virus scanning, and vpns. I'm also a developer. If I'm not connected to the internet I'm not able to debug my ...
12
votes
5answers
2k views

How does a network admin block the reverse SSH in company?

Given firewall inbound: all are blocked outbound: allow port 80, 443 Problem colleagues are still able to ssh to home device by port 80/443, and establish a reverse ssh tunnel from company to ...
0
votes
2answers
216 views

Firewall tiered architecture and firewall brands in today's context

In the past, we were often taught that we should have at least two layers of firewalls and it was best to use different brands so that at least it would make it more difficult for hackers to penetrate....
11
votes
4answers
465 views

External Vulnerability Scan of DMZ

We currently have an internal and external vulnerability scanner setup in my organization. This morning our external scanner was going through a new external DDoS protection service instead of ...
4
votes
4answers
2k views

Are firewalls required if using a VPN [closed]

If you are using a VPN to transmit data from router to router, do you still need a firewall? I am using a VPN Server to encapsulate data from one cisco router to another. Do I need to have a firewall ...
1
vote
1answer
290 views

Was I hacked remotely, how could I find out? Windows 7

I was cleaning out my old windows 7 HP desktop computer approximately 5 months ago. There was only the expired Norton 360 as far as antivirus and no firewall. Up until this point I disabled the wifi ...
0
votes
0answers
34 views

where can we download SourceFire log/message guide?

I need to write few alerts in SIEM based on Device:Sourcefire. Can anyone let me know from where we can download Sourcefire log/message ID as CISCO ASA firewall has it.
2
votes
1answer
136 views

What is the core purpose of a firewall on a linux server that is connected to the internet?

When I deploy new linux servers - I start off with a bare bones Ubuntu Server OS and install only the services that are needed. SSH webserver - port 80 These services have iptables rules setup to ...
2
votes
2answers
490 views

Telnet port open on my router public IPv6 address

Recently I upgraded my home router into this one. It is a cheap one, but it has features I needed: IPv6 support and Gigabit Ethernet. So I decided to give IPv6 a try. I configured a Hurricane ...
1
vote
0answers
33 views

iptable ip_conntrack_max testing

I was trying to understand how ip_conntrack_max works so i have created two VM and set ip_conntrack_max to 10000 I used hping to open 10000 udp connection on VM using following command hping --udp -...
-4
votes
1answer
171 views

Security Setting up personal web server [closed]

I'm sure something like this has been asked many many times over the Internet. I'm asking again because I need situation-specific response. I've already set up a home web server. My setup is like this:...
3
votes
3answers
552 views

iptables rule to ban and redirect malicious traffic

I'm running Apache 2 and after analysing the access_log I discovered that my website is visited more than 800 times a day (today 924) from majestic.co.uk bot. The bot use this range of IP addresses: ...
1
vote
1answer
141 views

Preventing outgoing Portscan/SYN/UDP Floods in the datacenter

We are a VPS hosting company that have servers housed in a datacenter in Germany. Currently we are receiving multiple take-down requests because customers are ports scanning or attacking servers ...
3
votes
2answers
385 views

how can an attacker access a system through a compromised router?

Let's say an attacker gained access to the admin panel of a home router with port 21, 23 and 80 open. I mean the attacker has full control over the router, thus being able to port forward, etc... ...
0
votes
0answers
69 views

Unfamiliar connection alert on Little Snitch

I've got a Macbook running Yosemite 10.10.5, on wifi, sharing it with three other people in the household. I currently have Avast on my Macbook (I know, I know), and its web shield works by acting as ...
1
vote
1answer
163 views

Strange IP's on my firewall log

Check the screenshot of my router firewall log below, I can see traffic originating from strange IP addresses to my public address. What are these? I've just setup this router few hours ago, am I ...
1
vote
1answer
47 views

Scope for information security in 2yrs down the lane? [closed]

I'm a fresher. Very recently I started doing Java course because of the wide opportunities we get to enter into an IT industry. Now, I've got an opportunity to work for a project that's related to ...
2
votes
1answer
173 views

Antivirus monitoring activity: why do they not have an internal firewall to prevent processes' access to user's documents?

A question that arises after an updated and licensed version of Norton Internet Security has detected a trojan installed in my new laptop (Windows 7 installed on 26 Aug'15 and fully updated). Trojan ...
2
votes
1answer
231 views

How should I tunnel arbitrary protocol traffic over HTTPS?

I'm posting this question from a moving train! (Ok, maybe that's not so impressive.) This train has an annoying WiFi - it's low-throughput, high-latency, tends to lose packets, and blocks most kinds ...
2
votes
2answers
890 views

What is the real benefit of a three tier architecture?

As per title, what is the real advantage of using three tiered architecture, where the user interface in one layer, the second layer for application and third layer for database? I can understand that ...
2
votes
2answers
40 views

Profile applications from traffic analysis

I'm investigating options for segmenting a less secure business unit behind a Cisco 5505. I want to take this action quietly and transparently for political reasons. I want to know if it is possible ...
11
votes
2answers
2k views

Firewall on smartphones

PCs communicate with the help of ports,eg. HTTP communication takes place over port 80. Due to the nature of these ports, an open port is an avenue for an attack. That's where firewalls come in. The ...
1
vote
1answer
72 views

Using a Firewall to Trigger Truncation in DNS UDP Response

Assume I am a firewall between client and server. If the client sends a DNS query with UDP, I should response this query with set the truncated flag=1. As a result, the client will be forced to use ...
0
votes
1answer
316 views

How to block detour programs that bypass firewalls?

We setup a ISG-1000 firewall about a month ago with the goal of blocking specific URLs. Please see image file below in which there are 70EA PCs. Even though we think we blocked specific URLs, some ...
2
votes
2answers
2k views

Is it Feasible to Block Connections That Windows 10 Uses to Push/Pull? - ie: Phone Home, Watchers, Monitors, Onedrive, Cortana, Bing, Shadyness, Etc?

Even with all the privacy, sync, and p2p settings off, using an offline account, I don't feel safe using Windows 10 for a business. I would like to restrict its ability to communicate to Microsoft (or ...
3
votes
1answer
754 views

Is it possible to force client use TCP instead UDP for DNS queries?

Assume I am managing a firewall between DNS server and clients. Is there any way to force clients use TCP rather than UDP, so we can prevent DNS spoof types of DDoS attacks?
0
votes
2answers
58 views

The workings of a stateful firewall

Say I have network A and network B. I wish to SSH from network A to network B. Hence, I would set a route from network A to B, and in the stateful firewall, I will allow a rule for Network A to B at ...
4
votes
3answers
221 views

Open ports with no services bound to them

I have been wondering: if a port is open for inbound connections on the firewall yet there is no service bound to it, would that be considered a security vulnerability?