Concerned with software or hardware firewalls

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1answer
47 views

Can firewalls decrypt SSL packets?

I was wondering if the firewall has the ability to decrypt the SSL traffic. If so, the network admin is able to read the data in clear text at transit.
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0answers
33 views

Multiple instances of programs allowed in Windows Firewall

I am new to Windows Firewall. While allowing a program through Windows Firewall, I found multiple entries present for Firefox and Java. Why is that?
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2answers
84 views

Using nmap to bypass a firewall and perform OS fingerprinting

How can I use nmap to perform operating system detection on a system which has all of its ports filtered by a firewall? Is there a way to bypass it? I have tried: syn scan, xmas scan, fragment ...
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0answers
24 views

100% load for Sophos UTM 9 [on hold]

We are using Sophos UTM 9.401-11. We are having about 10 - 15 spikes each day, each spike taking between 5 and 20 minutes. During the spikes, there is 100 % CPU high load on Sophos and Internet is not ...
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0answers
38 views

DDoS Solution for request floods [duplicate]

What are the mitigations to protect from ddos? Is using firewall like cloudflare would help or not? My use case is just want to make sure that no one is sending flood of requests i.e. thousands per ...
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0answers
26 views

some questions for my penetration testing [closed]

I would like to make a penetration test to my lab, is it possible to use upnp protocol in order to get behind my firewall (it blocks all ports, but lets only session to come in)? I would like to make ...
1
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1answer
63 views

UDP DNS & Firewall

This question might be simple but please understand my lack of knowledge. I am seeing a lot of DNS packets dropped by our firewall (sophos SG125) by default rule 60001. There are three Domain ...
0
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1answer
128 views

Acceptable secure solution to replace static IP addresses for a web application

I am currently working as a technical lead on a project at a financial institution and have a question about how to provide the same level of security expected by the business in an application we are ...
4
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2answers
4k views

Windows Firewall Connection Security with Certificate

I've been fiddling with the Windows firewall configuration of some computers within a VMWare based LAN (no domain). To aid in my testing and debugging, I created a small, self-hosted console ...
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0answers
51 views

Modifying shell code to bypass Windows Firewall

As part of my OSCP's training, I'm supposed to get a shell on a Win7 machine using browser's exploit (MS12-037) with Windows firewall on. I have an idea but I'm having hard time applying it. What ...
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0answers
31 views

Allowing a program through a Windows Firewall [migrated]

I am new to Windows Firewall. I have seen this dialog and unable to understand its meaning. The above dialog says that "Allow python to communicate on these networks:". It then gives two ...
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2answers
87 views

Determining Firewall settings (Ports, etc) for specific applications

How can we identify the network or network firewall requirements for a Desktop or Web application. Meaning what ports are required by the applications. How the Cloud and non Cloud networks communicate ...
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2answers
39 views

Is there a difference in security between an IP address white list and a domain white list with TLS?

It seems to me that an IP address white list relies on easily spoofed information, while a domain white list, if it forces TLS, at least, relies on the validity of the certificate systems. I may be ...
1
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1answer
79 views

How does a malicious user connect to a private network?

I have followed these instructions for setting up a couple of servers to have private networking. It ends by saying "It is important to secure your private networking interface the same way you would ...
2
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1answer
153 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
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2answers
82 views

How to block I2P and Freenet to my network?

I am trying to find a way to block I2P and Freenet darknets in a corporate network. Does anyone know a way to block them (on firewall)? Do I need to close particular ports or block entry nodes (like ...
1
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1answer
38 views

Question about IPv6, NAT, firewall, port forwarding, upnp and security

In the next months/years my ISP might give me IPv6 for my home connection. But what are the security implications? Will local network servers/embedded devices be accessible from the whole internet? ...
0
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1answer
31 views

Firewalled bots in UDP p2p botnets?

One thing that I don't understand about peer to peer botnets, is how a bot stays connected to the network considering the protocol used is UDP. Since the UDP is connectionless, and the bot is behind ...
2
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1answer
49 views

Counting on firewalls only : sound security strategy to prevent intrusion?

I had this discussion with a friend of mine who is a windows sysadmin. He said to me that for his company's IT security, he is doing only updates on the windows server. But except these system ...
2
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1answer
78 views

What are the security implications of autorun and external drives?

I have some questions about the security implications of accessing internal and external storage since I cant find any more information on it from what I've read. I have read about a variety of ...
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2answers
92 views

Shared Office Network Security - VPNs, Firewalls, and systems

First, let me premise this post with the fact that I am completely new to network security. I have done a fair bit of reading up, but I am certainly by no means a professional. If anything I say here ...
7
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5answers
29k views

How to bypass tcpwrapped with nmap scan

I'd a scan task and I faced following result Host is up (0.032s latency). Scanned at 2012-10-25 16:06:38 AST for 856s PORT STATE SERVICE VERSION 1/tcp open tcpwrapped 3/tcp open ...
10
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4answers
11k views

How to listen to all ports (UDP and TCP) or make them all appear open (linux)

I got an external Debian server. The problem is that my university campus doesn't allow connections to go outside when the port is different than TCP port 22, 80, 443, or UDP port 123. I tested them ...
2
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2answers
35 views

Why do ALGs restrict traffic on a given TCP port based on the protocol?

My understanding is that application level gateways restrict the traffic they proxy based on port and protocol - say HTTP over port 80 or MQTT over port 1883. Both types of traffic are using TCP as ...
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2answers
703 views

Attacking a server on port 80 while only port 22 is open on the firewall

There is a question bugging me a after reading on network security. Theoretical situation: there is a packet-filtering firewall, which only accepts tcp/ip communication with destination port 22 on a ...
2
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2answers
192 views

How would iOS or Android app “firewall” for extended permissions (location, etc) work?

I'm interested in blocking or reporting any application's usage of extended permissions, regardless if they are granted those rights, such as: GPS / Location / Wifi Radio signal data Telemetry My ...
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4answers
68 views

Zero-day malware protection [closed]

What is the best approach in defending your company against zero-day malware? Is there a firewall/system to do that? Is it good to run every file in a sandbox and to track activity of the sandbox?
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2answers
53 views

Protection against file distributed malware

Let's say I have one server called A which host an upload website which is connected at the network connection B. Let's say one of my clients uploads multiple .rar files of 1 MB (that contains malware ...
3
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1answer
39 views

Better alternative to WAF path whitelisting?

We are managing a WAF which is being used by some applications. Recently I tried to use a Valid URL module to white list all the APIs and static resources of an application. Although from the security ...
1
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1answer
45 views

Best appraoch to test inhouse firewall effectiveness

We have Fortigate 100D that has antivirus profiles enabled like SMPT, POP3 and IMAP. How one could make sure that the antivirus is working as expected ? For instance it seems that Fortigate has ...
5
votes
1answer
841 views

Firewalk through a Firewall on our subnet

Having trouble firewalking. I am trying to determine all the open ports on my firewall/gateway. Here is my lab network diagram: (Skip to the bottom of the following explanation for a direct list of ...
3
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1answer
21 views

Why can't nmap identify the danted(socks5) service on non-standard port?

I'm testing nmap's abilities, I started a socks5 proxy server with danted, and started it on port 10090 I tried the following command, and expect it to tell me port 10090 runs a socks server, nmap ...
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2answers
199 views

Setup a private VPN for family in China?

I have family in China. During the past weeks their internet connection was severely limited. VPNs such as Astrill and similar weren't working anymore. Is it possible to setup my own VPN (or ...
2
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1answer
58 views

If a firewall deletes DOS packets before they reach the designated application. Is it then possible to break trough the firewall with a DDOS attack?

My Question is that if a Firewall blocks for example a DOS attack of UDP packets. Is it then possible to "break" or take up the capacity of a server by sending enough packets trough a DDOS attack? or ...
9
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6answers
7k views

Is blocking UDP and TCP sufficient to prevent unwanted network activity?

I want to be 100% sure that my machine only connects where and when I want it to. If I use a firewall that blocks all UDP and TCP packets but those that I explicitly allow to pass, can I be 100% sure ...
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2answers
78 views

Using Two Different Brands of Security Tools To Block Backdoors

There's this idea of using 2 brands of firewalls both inline that is usually brought up: {Internet}<-->FW(A)<-->FW(B)<-->{Internal Network} Or using 2 algorithms: {Plain ...
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2answers
42 views

What is the difference between single hardware firewall and router?

With some googling, I learnt that routers contain hardware firewall. But I saw in many pictures that firewall and router devices are apart as follows: I know that there are a lot of firewall ...
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4answers
42k views

What is the difference between antivirus and firewalls

I need a brief explanation about the differences between antiviruses and firewalls
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0answers
36 views

NetScaler config rule sample for cross site scripting attacks

I am trying to create rules to block requests to pages where XSS vulnerabilities have been detected. Lets say the /contact_us page is vulnerable to XSS, how can I block traffic trying to reach that ...
1
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2answers
59 views

Deep Packet Inspection: Any real world examples of threat mitigation via DPI? [closed]

So I understand conceptually how DPI works, but I'm a little skeptical regarding the actual benefits of this technology. Considering the possible risks associated with deploying DPI, i.e., decrypting ...
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0answers
31 views

VPN and traffic filtering

VPN server assigns to the client public ip address and doesn't offer NAT function. In this case, can firewall on the client side to filter (inspect) VPN traffic (L2TP/IPSec, IKEv2, SSTP, OpenVPN)? I ...
16
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3answers
4k views

Running windows in virtual machine, should I bother with security?

I'm running Windows in a virtual machine on my mac (via Parallels). Should I bother installing antivirus, firewall and using other conventional wisdom practices (like don't open unknown .exe etc)? I ...
19
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4answers
2k views

Detect non HTTP packets using port 80

We are currently doing port whitelisting on our firewalls which is working well but this of course does not prevent the implementation of side channels or the misuse of these ports for other purposes. ...
3
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3answers
192 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?
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0answers
69 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 ...
2
votes
1answer
67 views

Linux (!) Network Architecture for CTF-scenario [closed]

My boss recently enrolled me in an InfoSec training. I am part of the network team, but have limited experience in InfoSec. My first assignment is to draw a layout of a network that will be used ...
15
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5answers
20k views

What is the best practice for placing database servers in secure network topologies

I have a classic DMZ architecture: My webserver is placed in the DMZ. The webserver needs to communicate with a database server. This database server is the most critical component of my network ...
5
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1answer
180 views

If all ports are closed, do I need firewall?

I often read an article which enables a firewall to secure public Wi-fi. But I think a firewall may not be needed when (like nmap said) all ports are closed. If all ports are closed, all packets ...
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0answers
138 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 ...
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0answers
24 views

How does a firewall protect against denial of service attack? [duplicate]

I do not know much about firewalls etc, but I am curious as to how a firewall protects against Denial of service attacks. My understanding is that, sending a lot of requests(more than the server ...