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Questions tagged [firewalls]

Concerned with software or hardware firewalls

1
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1answer
181 views

Could an attacker spoof a whitelisted IP to access the network?

There is a network that is protected with a firewall and only one IP is whitelisted. Assuming the attacker knows the whitelisted IP, what would prevent an attacker from sending traffic via a spoofed ...
0
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2answers
190 views

Is an ACL Sufficient for business firewall?

I am a relatively new IT specialist for a small company (about 30 employees, 100 more seasonal.) Most of our systems have been outsourced to an IT company long ago, that handles licensing, VDI, PBX, ...
1
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1answer
81 views

Refusal to 'open' up corporate network?

I am working a project which requires access to a service running on a remote server, over a single TCP port (>1024). This service runs on a machine located within an existing network, and the project ...
2
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3answers
91 views

Whitelisting DNS vs. Packet filtering Firewall

I am an information security intern for a MSP. The company is set up to work remotely a few days a week. As I was gathering information for the assessment, I found out that one of the employees does ...
1
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2answers
3k views

Can a hacker hack into port 80?

We normally say port 80 is firewall friendly. But can a hacker just hack into port 80 via TCP or UDP? Or is Port 80 by default not always open? It waits for the host to initiate a connection via ...
2
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2answers
2k views

Should I allow communication on public networks?

I apologize if this is a newb question. Reading this prompt, it appears that I should check Private Networks and uncheck Public Networks. However, Windows defaults to the opposite being checked. Am I ...
4
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2answers
3k views

Is it dangerous to disable the IPv6 firewall built into many home routers?

The router that my ISP has delivered contains an IPv6 firewall. The only configuration option is whether it is on or off. Apparently, this firewall simply denies all incoming connections. I ...
0
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1answer
600 views

Comparison between WAF and IPS/IDS

I would like to know the difference between WAF and IPS/IDS? Can IPS/IDS handle an attack on a web application? If there are differences functionally between the two applications, how they work ...
0
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3answers
816 views

How did EternalBlue bypass firewalls?

I've tried recently to run the EternalBlue exploit via metasploit (on VirtualBox lan), and I've spotted that if the victim PC uses the most naive windows-firewall than the attack would fail. That got ...
0
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3answers
591 views

Are there any feasible ways to block the stunnel utility at the network level?

The stunnel utility written by Michał Trojnara allows, if I understand correctly, to "wrap" non-SSL protocols (such as ssh) in an SSL connection. For example, imagine that all network ports on a ...
5
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1answer
173 views

How to eradicate and recover a compromised network

I have a somewhat broad question related to a specific, ongoing threat that I am trying to define and defend against. Right now, I need to rebuild a secure access point for my mobile devices and ...
4
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3answers
186 views

Should network firewall rules be secret?

At my workplace only the security team have access to see the rules on the server network firewalls. Developers and system engineers don't have any visibility, so they just deploy applications to ...
0
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1answer
593 views

Firewall doesn't support TLS 1.2

I have an ASA 5550 firewall that doesn't support TLS 1.2. What impact would we have when the older protocols are disabled? Will this affect the servers at all?
0
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1answer
48 views

Limited remote access to a web application [closed]

I would like to set up a very simple node.js web application on raspberry pi and access it remotely, from outside the LAN. There are no other hosts in that LAN with the Raspberry. I only need to ...
1
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0answers
86 views

How to block all aplications from internet connection?

I would like to block all windows10 applications from internet access So I found a settings screen on the windows firewall (Windows Firewall\Allowed apps) I would like to uncheck everything from this ...
2
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0answers
105 views

Comodo Firewall HIPS (Paranoid Mode) Regedits

Old time lurker and odd poster here with a general question. I think this might fall more in the nature of understanding system processes. I've activated comodo HIPS on paranoid mode to firstly see ...
0
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3answers
139 views

Get data without Firewall detection

I was browsing through some cyber security questions and I came across a question that kept sticking in my mind so I figured maybe I just ask here. The question is: What is a way to get data from ...
0
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1answer
166 views

Find out the IP or hostname of the firewall? [closed]

Is there a way to find the IP of the firewall which is blocking my access to an endpoint? I tried netcat / nmap but not much luck. I need some form of a tool which does a traceroute to the subnet or ...
2
votes
1answer
107 views

UFW appears to block connections from remote address, but NAT is disabled on my router

I'd like to understand what the following line means exactly, because similar lines can by found in my system log pretty often and I would not expect any. [UFW BLOCK] IN=enp2s0 OUT= MAC=72:8a:bd:21:...
2
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2answers
278 views

Router Security Log Shows Many Blocked TCP Connections

When checking my router tonight I looked at its security log. I saw thousands of blocked tcp traffic. Why are these considered security events? The log shows many blocked tcp incoming request from ...
0
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2answers
58 views

Concept using ssh to create dynamic firewall. Good or Bad idea?

The Goal Create a secure process to open a firewall port on a server (on demand), start a listening server, and ultimately close the firewall port. This would improve security by not always having a ...
3
votes
2answers
104 views

Where do products like BlueCoat and ForcePoint get there URL categorizations from?

I recently had an issue where I released software which made use of a new URL and several of my customer sites complained that the software wasn't working within their wifi network. It turned out ...
0
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0answers
73 views

How should firewall be configured to allow using an image scanner over WiFi to avoid jeopardizing security?

I'm having a dilemma if I should post this here or on superuser, finally I decided it's more security related so I post it here, if it's wrong please move. The situation: There is an Epson all-in-one ...
1
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1answer
92 views

Social Engineering Attack awareness using .doc and spoofed email

Need advise for our company experiment. We are planning to observe the security awareness among our staff. I have an idea but lacking of knowledge on how to do it. I want to create spoofed email and ...
3
votes
1answer
495 views

What's the difference between an “application-aware firewall” and a “web application firewall”?

I'm studying for the CCSP and my training material isn't very clear on the definition between "application-aware firewall" and "web application firewall". The training material states: Early on, ...
3
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0answers
47 views

What is this “…ffff:ffe2” traffic being blocked?

I have a fairly simplistic pfSense setup. IPv6 is provided through a Hurricane Electric tunnel. Something on my home LAN is sending traffic from an odd-looking address, and so it's getting blocked, ...
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0answers
32 views

Windows 10 disable most networking

Is it possible to disable all networking besides the web browser on Windows 10, especially including Microsoft-specific services? This should help with privacy concerns.
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0answers
99 views

SSH Tunneling Issue with Plink

so I'm trying to follow this tutorial to bypass firewalls and IDS by routing traffic through an SSH pipe and receiving a Meterpreter reverse shell (reverse_tcp) from a Windows computer across the ...
4
votes
1answer
239 views

How to distinguish between “normal internet” Port scan and more “serious” port scan preparing attack?

In a complete network infrastructure, with firewalls, routers, servers supervised by a SIEM, LogPoint here. Of course, there is a private network and public servers. in the LogPoint there is an ...
3
votes
1answer
283 views

Meltdown and Spectre regarding Firewalls and Sandboxing [duplicate]

I don't deeply understand Meltdown and Spectre -- all I know is that they are basically keylogging-like vulnerabilities within the CPU, which bypass any application layer stuff; correct me if I'm ...
3
votes
1answer
2k views

NMAP - Closed vs Filtered

A lot of people seem to ask this question, as there are a bunch of posts about it; however I feel like none truly answer the question (that I have found). I want to understand why NMAP decides to ...
0
votes
1answer
373 views

ufw and nmap show different result in terms of open ports

I have set my firewall ufw / firewall rules as follows: Default: deny (incoming), allow (outgoing), disabled (routed) To Action From -- ...
1
vote
3answers
343 views

Is hardware firewall needed for a local network without internet access?

Is a hardware firewall needed for a local network without access to other networks? The local network only consists of a server with SQL database, workstations & PLC controllers. I am asking ...
0
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1answer
195 views

With an IPS in place, do we really need firewalls?

I was reading the article "Do you need an IDS or IPS, or both?" on TechTarget. While reading the author's explanation of IPS this question hit me. If an IPS is a control tool that uses a set of ...
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0answers
469 views

How to determine DoS protection rates for firewall

I am looking to enable my Firewall's DoS protection, and when searching for values to put in the rate fields, am finding that the answer is usually "it depends". While there is almost always room for ...
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2answers
82 views

Secure access to an aplication from internet [closed]

I have an application wich needs to connect to the main database. I want this application to be accessible from outside the enterprise network. I think that the best way is to install the app in a SQL ...
3
votes
1answer
59 views

how to check what process connects to my squid

I found today, that I have open proxy (squid on Debian). I fixed the firewall rule, and now I'm not. But someone still uses this proxy - it looks like it is proxying from inside my machine. I try to ...
0
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0answers
952 views

connections to AkamaiGhost

I've seen two computers on a network are initiating connections to AkamaiGhost server on the Internet on port 80. Is this a security violation? Firewall is blocking them, and no one is actually doing ...
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0answers
34 views

I have a question on hardening my windows 8 host firewall rules

I use the following setup for my internet connection. MyPC/RDP -> RDS server -> Internet (this is over a paid public WiFi access point). What I want is to strengthen my Win 8 firewall rules (...
3
votes
2answers
1k views

Should I allow incoming traffic from source port 443?

I am hosting a web server, both standard and SSL. Both work fine currently. In my logs, I've noticed what seems like a distributed port-scan: 10-15 port queries from random hosts occuring within ...
0
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0answers
775 views

Deny a plugin (.dll file) access to the Internet (windows)

I want to deny a VST plugin access to the internet, but when I try to block it in Windows Defender, the file doesn't show up. The file/program is being opened only in other programs (in this case a ...
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votes
1answer
59 views

What is the meaning of “me” in ipfw rules?

ipfw is an IP firewall and traffic shaper control program. The term "me" appears on ipfw statements like below: ipfw add 02050 allow tcp from me to any out I would like to know exactly what "me" ...
7
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4answers
984 views

SIP UDP request breaking through iptables

I have been investigating a few instances recently where SIP UDP traffic has been somehow evading the ruleset defined in iptables leading me to suspect that there is a hole in our rules so i'm looking ...
0
votes
1answer
582 views

Are there risks in not having a edge firewall? [duplicate]

I am currently working with a client that has all their external traffic going through the core switch and then is being passed to the router and back through the core switch and then to the rest of ...
0
votes
1answer
47 views

Is a firewall required for a SOHO network? [duplicate]

Would a firewall router be required on a SOHO network ? The network has a LAN to LAN VPN (no end user in). There is no server / services on the network other than some consumer IOT devices, the ...
7
votes
2answers
516 views

What are the real world risks of opening ports for multiplayer games?

We have a multi-user enterprise training application built using the Unity game engine and are discussing the security implications of adding a Windows Defender Firewall rule globally opening an ...
5
votes
3answers
642 views

Does blocking an IP with IP Tables protect you from a DOS (not DDOS) attack?

I am fairly new to network security, and I just learned about the Fail2Ban framework you can use for automated exploit detection/prevention. It says that you can protect yourself from DOS attacks by ...
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0answers
81 views

I am looking for a new firewall [closed]

I am looking for help on purchasing a firewall and some information on firewall recommendation. I am not really technically savvy but, I understand a bit about networking so bear with me. I have been ...
0
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1answer
51 views

Historical IP reputation data

I have a firewall log with events from 2 years ago. I want to examine that log as if I was investigating at the time of collection (2 years ago). However, I would like to use IP address reputation ...
2
votes
1answer
310 views

How to perform a port scan against a target with a software-based firewall?

I use NMAP to perform port scanning, e.g., TCP SYN scan: nmap -sS 192.168.0.12. I've two virtual machines running Windows XP and Windows 7, respetively. These have several services running, e.g., ...