Questions tagged [firewalls]

Concerned with software or hardware firewalls

70 questions with no upvoted or accepted answers
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830 views

Firewall in virtual machine

I'm putting my server to use as a file server and a firewall. I'm looking at KVM or Xen VM setup, where file server and firewall get their own VMs and host is just supplying the hardware (so Xen way, ...
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1answer
2k views

I want to restrict access to Nextcloud using OpenVPN

Is it a good idea to restrict access to my Nextcloud server by using OpenVPN, so every user (this is for small group of people), will get their own VPN account and after that they will be able to ...
3
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1answer
223 views

How can Nmap bypass Windows Server firewall rules?

I need to block all communication (inbound/outbound) from server A to server B (all ports/all protocols). Server A should communicate with every machine except server B. I can't place firewall rules ...
3
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0answers
50 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, ...
3
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3answers
288 views

Web Application Firewall using web app source code analysis

I read this page: Category:OWASP Best Practices: Use of Web Application Firewalls, and I found that WAF cannot generally detect logical attacks. We know each web application has a number of input ...
3
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0answers
538 views

Configure icefloor to prevent leaks when VPN connected

I am trying to configure the icefloor firewall on OS X 10.9 so as to make sure all traffic will go through VPN. I recently notified that even with "Route all traffic through VPN" option in ...
2
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0answers
42 views

Secure AWS instance metadata against potential SSRF

I am running a Windows instance on AWS. The instance has an IIS service running on it. The IIS service has a user associated to it and it has no need to access the AWS instance metadata. I was ...
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0answers
34 views

Beginner UFW question about destination any

I'm learning about UFW with a Raspberry Pi and I don't a couple of things when it comes to UFW rules. Can anyone help me suss a couple things out? My first question is about the destination any. If I ...
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0answers
151 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 ...
2
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0answers
102 views

The way for not disabling the firewall in windows

I have been doing this for about a year without knowing the purposes of disabling. Whenever i tried to ping/connected to my host VM via guest VM, i have to disable my host VM's firewall, but does it ...
2
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0answers
331 views

Blocking Multiple Failed Postfix AUTH Attempts with CSF

I am using CSF/LFD on my CentOS 7 server, and would like to use it to temporarily block IP addresses that have multiple failed Postfix AUTH attempts. You know the one, I get line after line of: lost ...
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0answers
2k views

Anyone can identify tool used to perform this attack?

recently I've identified that some hack attempt was performed at one of my servers. I have dumped nginx logs to github, please take a look and try to identify which tool was used to perform this ...
2
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0answers
928 views

Isolating Computer on Home Network Using Multiple Routers

My goal is to isolate a computer on my home network. This computer (a rapsberry pi) should be considered untrusted and is accessible from the internet (port 22). I need a solution that will prevent ...
2
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0answers
363 views

What is the security of Powershell “TrustedHosts”? (is it just a name match)?

Powershell has a TrustedHost section that is configured like this: winrm s winrm/config/client '@{TrustedHosts="CorpServer56"}' What security is implied for CorpServer56? Is it just an ASCII name ...
2
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0answers
233 views

Why my proxy is still having some connections blocked

I am behind a firewall in France. I connect to proxy A, in Ireland with Dante via SSH port 22 and make a tunnel forwarding port 1080. The proxy works as expected but still having a port range blocked....
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227 views

Shorewall stopped policies - routeback

Here goes a very specific question about the insides of Shorewall and Iptables in general. Shorewall supports configuration of "Stopped Policies" using the file routestopped, which defines the ...
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36 views

Inbound rules for a port is configured and disabled yet an NMap scan shows that the port is opened

I am new to Windows Defender but have read about it to understand the basics of Inbound/Outbound rules. As mentioned on the app, Inbound connections that do not match a rule are simply blocked. For ...
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0answers
45 views

Securing a SOCKS5 to SSH Tunnel on Windows

In order to gain web access from the perspective of a remote device, it is very common to use the SOCKS5 to SSH Tunnel capability built into OpenSSH Client and Putty (detailed here). Both clients ...
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36 views

apache struts 2 s2-057 does not return shell?

i do a pentest for a private server protected by cloudflare .. i already bypass WAF and got the real ip for the server then i scan it by acunetix and i found a : Apache Struts2 Remote Command ...
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0answers
93 views

Reverse shell working with kali 2016, but not kali 2019.2, using Metasploit ms08_067_netapi

I have an unpatched Windows XP Home VM, a Kali 2019.2 VM and an old Kali 2016 VM. Using Metasploit's ms08_067_netapi module, I'm able to successfully get a reverse shell but only on the old Kali VM. ...
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0answers
54 views

Is Windows RPC (port 135) secure enough for domain-wide access

I have a network of approximately 150 computers that I'd like to regularly monitor. My proposed way of doing so involves running remote commands like reg query \\<ip> or systeminfo /S <ip>....
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1answer
251 views

WebRTC.Local.IP.Addresses.Disclosure

We have Fortigate perimeter firewall and today i detected this event. What should I do to improve protection? How can someone take local IP address' through a Firewall? The following intrusion was ...
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0answers
78 views

Weak ciphers in TLS VPN

We have a firewall out of our firm network and administrators connect to this firewall by VPN over TLS. Scanning this firewall, the vulnerability scanner get us some warning as the 443 port allow weak ...
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1answer
104 views

Fortigate Creating Millions of DNS events to standard domains

I am trying to tune our SIEM and noticed that we are receiving millions of DNS records every day from the same domains. These are: update.microsoft.com swscan.apple.com softwareupdate.vmware.com ...
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0answers
70 views

health check to test haproxy — request deny with 200. good idea?

I have been working on a multi-provider redundant load balancing solution using HAProxy, AWS, and Cloudflare. I have a solution, and I believe it will be secure, but I am looking for further ...
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91 views

UFW (Uncomplicated Firewall) Question

I was wondering if there's any benefit of adding following rules to a Raspberry-Pi directly exposed to the internet: sudo ufw deny to 0.0.0.0/8 && sudo ufw deny to 169.254.0.0/16 && ...
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0answers
38 views

Are parts of my system susceptible to IP based malicious attack even with effective IPtables rules?

Yesterday I installed Cent OS 6 and had to flush the default IPtables rules (IPtables -F) in order to access a web app via my browser. Having very little experience with Linux/Network security this ...
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0answers
95 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 ...
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1answer
400 views

Why won't ossec block SSH connections when it seems to be configured correctly?

Why won't ossec block connections from another server? I installed ossec version 2.9.3 on Ubuntu 16.04. In the ossec.conf file I have these lines where x.x.x.x is the IP address of a second Linux ...
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0answers
381 views

How secure is my MLab Shared Cluster MongoDB database?

I have deployed a Meteor application to Meteor Galaxy. I've also created an Mlab.com Shared Cluster MongoDB. Link to the plan features. My application has an SSL certificate installed on the domain. ...
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0answers
182 views

Security risks introduced when moving from a three tier to a two tier architecture

I host several .net web applications using a standard three tier architecture with web servers located in a demilitarised zone. I have been asked to host a two tier .net web application where the web ...
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151 views

Bypassing Client firewall restrictions

Lets suppose we have 2 parties A(me) and B(participant). I want to communicate with B but B's firewall restrictions are not allowing me to communicate with him. Is there any way that I can bypass B's ...
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0answers
46 views

Firewall rulebase analysis offline/vendor agnostic a thing for FISMA/NIST

During design-time before a build-out, I currently create an excel file version of a firewall rulebase (policy) representing source/target/port/protocol/etc definitions before being pushed to the ...
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205 views

UFW behind modem does not block remote IP

I have a small linux server with fail2ban and UFW installed and configured behind internet gateway modem which ssh port is forwarded to server. The attackers are discovering by fail2ban and added to ...
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0answers
1k views

Different filtering techniques with internal and external firewall?

First of all, lets get the basic information sorted out. Just in case I have it mixed up. There is an external Firewall - Router (or some such device), and there is an internal Firewall (an ...
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82 views

Simple DMZ Question Regarding Physical Hardware

So when talking about at setting up a DMZ, if you are currently running a web server, app server, and a database server on the same physical host, you need to migrate them to separate physical hosts ...
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0answers
103 views

Clustered Juniper devices using public DoD IP addresses for communication?

Ok, so I have to admit I am not an expert in how Juniper networked devices work, so this entire issue might be why I am having issues understanding something I am seeing on a pair of clustered SRX210H'...
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0answers
216 views

Filter multicast on a LAN

In my dd-wrt firewall, I see the option: filter multicast I searched a lot about filtering multicast, but I could not find a comprehensive reply about this. Should I filter multicast on my LAN?
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1k views

Gargoyle (OpenWRT) firewall routing for VPN

At present I have Gargoyle setup on my WNDR3700 to connection to a VPN provider in order to provide a little privacy. However this prevents me from connecting remotely to my home network. Previously I ...
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0answers
144 views

Why does Windows realtime protection block specific URLs?

I have observed this strange behaviour with Windows (7 to 10). When active realtime protection is enabled, it blocks my own website. The page has nothing special (PHP and JavaScript), just good old ...
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0answers
177 views

Fortigate monitoring with SNMP and Devmon template

I'm trying to monitor some aspects from our Fortigate firewall (like how many traffic goes through each tunnel) through a combination of Xymon, Devmon and SNMP. I downloaded the MIB files from the ...
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0answers
45 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 ...
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0answers
80 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 -...
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177 views

Web/search engine spider on local network?

I was setting up a test webserver on my local network earlier, and whilst sorting out the firewall I noticed the following in the log (/var/log/ufw.log - I'm using UFW on Ubuntu 14.04): Jul 9 14:17:...
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0answers
265 views

Firewall requirements for SaaS service providers

I have not had much success compiling a workable overview on the topic of firewalls and application service providers, despite making a rather extensive contribution to Google's workload this month. I'...
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0answers
629 views

How should I configure my Tor-dedicated firewall for optimum security?

I'm setting up a Tor-based isolating proxy using the 'Anonymizing Middlebox' iptables rules specified here: https://trac.torproject.org/projects/tor/wiki/doc/TransparentProxy i.e. iptables -t nat -...
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0answers
120 views

API deployment infrastructure

We are going to deploy our service, it's drupal based with some additional REST APIs. The drupal servers will be (loadbalanced) put in the DMZ. We think to deploy the REST APIs on an app server in ...
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0answers
787 views

Proxy via pfSense and exclusions for DNS

I have posted this to NetworkEngineering.SE, as that seems the more suitable audience for this question. I will leave this question open here but am happy to see it closed. I just did not want to ...
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0answers
101 views

Pf rules configuration

Do these rules appear to be an adequate start? _interface="en1" _linode="66.228.57.75" #lish-atlanta.linode.com _ssh=" { 74.207.224.182 66.175.210.225 } " set block-policy drop set skip on lo0 ...
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0answers
522 views

Throttling DropBox behind a firewall

Our office network bandwidth gets choked when an employee copies a large file into her DropBox, since it gets downloaded on several machines (of other employees). LAN Sync is an option, but needs to ...