Questions tagged [firewalls]

Concerned with software or hardware firewalls

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17 views

Block `pip install` but not pypi search/documentation [migrated]

I have configured a proxy for PyPI (which uses a security service to vet module requests). I want to block direct access to downloads at the network firewall without affecting pypi.org's usefulness as ...
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90 views

Sending traffic to cloud proxy with GRE vs. IPSec

Taking a look at several cloud proxy/CASB vendors, they all seem to have the same recommendation of primarily using a tunnel to deliver internal traffic to them -- either GRE, or IPSec. IPSec ...
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11 views

Windows firewall: How to change existing rules using netsh [migrated]

I can create new rules using netsh advfirewall firewall add rule... and Delete them using netsh advfirewall firewall delete rule... But I am not able to find a way to change existing rules. Right ...
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1answer
49 views

Why is the -L (list) option of iptables not available to non-root users?

Many tools in Linux allow for checking things as a non-root user. For example, at any time, I can check whether a service is running: $ systemctl status ntp However, the iptables needs to be used as ...
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1answer
69 views

From a modular development standpoint, should a “firewall” do anything else than filtering ports?

From a modular development standpoint, should a "firewall" do anything else than filtering ports? This leads me to further ask, have there been attempts to reform the terminology from "...
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76 views

Should you set up firewall rules with a vpn?

I am using a vpn and trying different firewall rules to keep as secure as possible. But the VPN company itself tells me not to use a firewall. Does that seem reasonable? They write: "As we've ...
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4answers
215 views

Is it good practice to disable firewall rules for vulnerability scanners?

I've been asked to ensure that our vulnerability scanning tools (like Qualys, Nexpose) are able to reach all of our AWS EC2 instances, on all ports and protocols. Today they are limited by the current ...
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1answer
108 views

Suspicious visits to one URL from same user-agent but from unique IPs

For the past few weeks, I am observing a lots of visits from a specific user-agent - Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.135 Safari/537.36 ...
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1answer
86 views

Can a firewall appliance block http requests? [closed]

Is it possible to use a firewall appliance as WAF? To make it more clear, lets think of a model like this: Internet > router > Firewall > webserver Can the firewall act as a WAF and block ...
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47 views

Whitelisting our app to prevent connection blocking?

We publish a Windows desktop app, and while I've run VirusTotal on all of our files with no hits, some security software blocks incoming connections on ports we use, leading to frequent user support ...
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40 views

Management Network Architecture

I've recently taken a job that has me more involved in network architecture than I ever have been, so please offer me some patience. I am standing up a network at a new office location. So far I have ...
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130 views

Only allowing WhatsApp traffic through firewalls

Problem: On our client's ship, we have an expensive backup internet connection. We want the backup connection to only allow WhatsApp traffic. This way we won't be greeted with an extreme bill because ...
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18 views

A bastion host is a firewall? [duplicate]

I don't understand the difference between a bastion host and a firewall. I think it could be related to the different level of ISO/OSI they work on: a bastion host works on application level (with ...
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1answer
215 views

Is it safe to set up your firewall to allow localhost to accept incoming connections?

I have set up a VPN client and I'm using iptables to block all connections not tunneled through the VPN. An example of the iptables rules I am using can be found here. Unfortunately with this ...
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1answer
89 views

MacOS Firewall Needed or Unnecessary?

Coming from Windows to macOS, I was surprised that the firewall was off by default. I immediately turned this feature on. Would this be necessary? Are there some cons to having the firewall on that I ...
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1answer
80 views

Are firewalls based on linux secure?

I recently set up a local server on my home network to host some files and personal webapps. In an attempt to improve security, I bought a pfsense-based firewall. I know some basics of networking but ...
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55 views

The incoming traffic was allowed on my home network for two days. How to assess the damage?

My router's firewall was set to accept incoming traffic for about 48 hours. Misconfiguration from a user, apparently. I have few devices on the network (two Windows PC, Freenas, printer, chromecast TV)...
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157 views

OpenWrt firewall mystery

I have my home network divided into multiple VLANs, with a main router running OpenWrt forwarding between VLANs, where each VLAN equals a firewall zone. Zone wan hosts the Internet router. Firewall ...
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1answer
54 views

Custom response for Web Application Firewall (WAF)

What should be the custom response code when WAF blocks a request due to matched rules or policy violation. We should kept the response code as 403 or 200 when WAF returns a response against a blocked ...
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1answer
104 views

How to monitor and manage ALL internet network activity [closed]

Is there a way to monitor and manage (block, unblock, log) all internet activity (mainly outoing traffic) from my computer? For example, in my android phone I've installed a VPN tool called "...
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2answers
77 views

Which firewalls filters should I consider applying to my company's website?

Context The company I work in is starting to have a more dynamic website, which can process sensitive user information. With so, we want to improve our security. We are a healthcare company from ...
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1answer
433 views

Can DPI block websites with ESNI?

I live in a country with censorship and was wondering if it's possible to bypass DPI by just enabling ESNI, DNS over HTTPS and Always HTTPS? If not, what else should I enable to bypass DPI firewall ...
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1answer
925 views

Logging into remote server via SSH using VPN (Wireguard). Is it foolproof?

I have a remote server into which I login via ssh. On this server I have setup a Wireguard VPN to which my host connects. The ssh server (ssh daemon) listens on a private IP interface (the server's ...
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1answer
68 views

How to know if the response is from the CDN and not the origin?

I am doing some bug hunting. I inserted a malicious payload into a request. But I am not sure if the response is from CloudFlare or the origin. Are there special headers which help me to distinguish ...
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2answers
197 views

I found an unknown UFW rule on my ubuntu server - have I been compromised?

The server is running the Kubuntu Desktop variant of Ubuntu (I transformed it into a server, I had things configured that would have been a pain to transfer to another installation.). One day I ...
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1answer
291 views

scan forwarded ports with OpenVAS/GVM?

I'm currently learning about network security and came across a problem, maybe I'm just missing something obvious but I'll try to explain my environment: I have a Kali Linux VM connected to the WAN ...
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5answers
5k views

Unidirectional continuous data transfer to an air-gapped computer

What would be a way to transfer files in one direction from internet-facing computerA => air-gapped computerB to protect the files on computerB from unauthorised disclosure, short of using an ...
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2answers
51 views

Securely Connect Employee PC to Business Private Network

I've recently become the "tech guy" at a startup, and am tasked with standardizing our hardware infrastructure. Further more, I choose how employees working from home will connect to ...
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31 views

Firewall rule such that I can only acess a website with VPN

I want to create a firewall rule such that I can only access a Website with VPN enabled. But I can't seem to find an option in windows firewall to say if my protocoll is not openvpn I can't access the ...
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1answer
59 views

Windows Firewall allows the connection to more than one user who shares the same external IP address

I wrote a stand-alone anticheat. When the client anticheat connects to its server, the server creates a firewall rule allowing the game client to gain access to the server. The problem is the firewall ...
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1answer
82 views

Is opening all ports on a router safe if it is simply redirection to a VPN server at 192.168.1.2:51820?

The motive for doing this is that I want to open other ports so that I can evade firewalls which block VPN connections. Instead of redirecting eg. port 53 or 123, I could simply set up a destination ...
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1answer
80 views

Possible ways to intrigue IP blockage on practical websites

Assume that I share the same IP address with others. Then if I can do something bad to intrigue practical websites, such as Google, Amazon, or jQuery to block me, then all other users will also be ...
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30 views

How is it possible for a Company to block Websites when at home, using DNS over HTTPS and no Certificate issued by the Company? [duplicate]

Let's say, I am in my home office connected through a VPN with the company network with a company device. When I am using Firefox, not controlled by the Company like Chrome or Edge, the certificates ...
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1answer
46 views

Whitelisting only domain not IP [closed]

Is it possible to whitelist only 1 domain name but not IP? For example: On some "Doogle" hosting is IP 1.1.1.1 and have multiple domain resolution for this IP: dog.com, cat.com cat.com ...
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0answers
48 views

How to Prevent Attacker from Abusing IPv4-embedded IPv6 to Bypass Security Mechanism?

Section 5.3 of RFC6052 explained how an attacker could abuse the NAT64 translation mechanism to bypass security mechanism such as firewall or IDS/IPS if those devices only have an IPv4 blacklist. The ...
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31 views

What are the best practices to configure security group in AWS web application?

I have a website hosted on AWS EC2, and I have some questions about security. How is the best way to protect my web application in AWS? Can I open the HTTP (80) and HTTPS (443) to the world (0.0.0.0/0)...
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2answers
688 views

How can I block hits to Youtube using iptables?

I want to prevent my daughter from accessing YouTube while she's attending school. So I was thinking to add protections in iptables. Unfortunately, when she goes to YouTube, the DNS resolves to IP ...
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1answer
106 views

What makes firewall pop up?

I am creating a file that uses Socket for exchanging data. When I use Python I have a firewall pop up where I am asked to accept the use of the application, but when my C++ program tries to do the ...
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1answer
346 views

Textbook uses terminology like Double/Single Bastion Inline/T to describe firewall architectures. Are these terms used in professional environments?

I apologize for the weird wording of the question title, I was hitting the character count. I am taking a network security course in college and the textbook we use, Network Security Essentials: ...
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48 views

Secure Implementation of Network Discovery Tool in Corporate Network [closed]

I would like to implement a network discovery tool, which automatically detects all devices in a network including OS information. I would like to do a very secure implementation. The biggest threat ...
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1answer
63 views

Getting an abnormal amount of firewall warnings on web server

I just had a look at the firewall status and saw it had blocked over 300 requests from TOR, Python Urllib, and some script called aabbccdd.xss.ht/pigeonburger.xyz (pigeonburger.xyz being my website). ...
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0answers
46 views

Unsupervised proxy - what could go wrong?

I recently finished setting up mitmproxy on a recently created DigitalOcean Ubuntu Droplet server. Almost immediately after opening the necessary ports in the server firewall and starting the proxy up,...
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71 views

Auto updating attack signature Firewall, WAF, IPS & IDS to secure Azure services?

We have a need to secure the Application Gateway and hundreds of APIs exposed to the Internet as part of our production environment. Using the existing built-in, Azure services, how to make it secure ...
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0answers
33 views

Using lulu on osx in home business setup. Any reason for external router base firewall?

I have Lulu setup under osx on my Mac. So say an errant program, curl, if it tries to access outside address is stopped. Would an external router based firewall bring any extra level of protection? I ...
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2answers
118 views

Best practices for firewall exceptions

My company has a firewall set up which, among other things, scans incoming files for malware. The scanner alerted about a malicious file that was downloaded to one of our machines. After some ...
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1answer
168 views

How to stop outgoing SSH on port 443

Let us say that a small company has an internal network for employees. All employees are granted Internet access via a NAT device (not a proxy) and perimeter firewall only allows outgoing connections ...
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1answer
2k views

Mongo DB hacked (read_me_to_recover) without the port exposed in the firewall?

I have recently set up parse-server on a DO VPS using 3 docker containers; one for parse-server, one for parse-server dashboard and one for mongodb. Because I am just testing this setup I left the ...
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5answers
6k views

Why is DNS-over-HTTPS such a big security nightmare compared to DNS-over-TLS?

I've heard the argument against DNS-over-HTTPS that it is supposed to be a security nightmare for network defenders because it enables encrypted DNS over port 443, compared to DNS-over-TLS which goes ...
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1answer
61 views

UFW does not block meterpreter

I am doing some pen testing on my wordpress server. I wanted to see what would happen if the attacker were to get a hold of my username and password for wordpress. So I used the standard exploit in ...
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2answers
88 views

Is there a bulletproof way to configure your AWS system? [closed]

I am learning how to configure a multi-region AWS system. However, everything I read says "if you want/need more security then do X". Why would anyone want less security (is what I start ...

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