Concerned with software or hardware firewalls

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2answers
158 views

Looking for a taxonomy of web attacks

I am working on semantic representation of firewall rules but could not find a good taxonomy of Web attacks in terms of HTTP protocol. I do find web attack classification i.e XSS attack, SQL attack.
2
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3answers
6k views

windows firewall turns OFF automatically

It seems pretty weird but for some reason, the Windows 7 firewall turns off. After I turn the firewall on in the control panel, it seems that it turns itself off when I go back to the control after I ...
3
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2answers
4k views

IPTables DDoS protection working with per client IP address counter AND UDP

I am looking to protect LAMP server with a software, which will detect above average number of requests from single IP numbers (in this case DNS queries), and add these hosts to IPTables deny chain. ...
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1answer
439 views

Exclude file names from mod_security patterns

I have a question regarding mod_security. I have installed mod_security on my server and OWASP core rule set. However, now people are having trouble when accessing my page. For example, one problem ...
1
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2answers
1k views

How is iptables useful to prevent attacks against a LAN?

I need some advice securing a LAN using iptables. I've found lots of examples on how to secure single host with iptables, including scanning ports, attacking using ICMP-flood and TCP-flood. These ...
1
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3answers
2k views

How to setup an internal firewall

I'm hoping to get some advice on a project I've been asked to look after at work. I do all of the IT for a small company that sits inside of a larger corporation. We need to prevent access to ...
4
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3answers
12k views

How do you properly setup Tor on Windows 7?

How do you properly setup Tor on a Windows 7 box to guarantee that ALL connections will run through Tor?
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2answers
27k views

Wireless client isolation - how does it work, and can it be bypassed?

Many SOHO routers these days support a feature called "wireless client isolation", or similar. What this is supposed to do, in principle, is to limit the connectivity between wireless clients ...
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1answer
238 views

IPtables - Accept Arbitrary Packets

I've achieved a lot on blocking attacks on GameServers but I'm stuck on something. I've blocked major requests of game-server which it aceepts in the form "\xff\xff\xff\xff" which can be followed by ...
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2answers
335 views

Securing a VPN connection

I'm new to this we want to install a new VPN connection that will be used to connect using Internet to some networks in the office the contractor want to use a" Cisco NAC Network Module or Cisco IPS ...
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1answer
307 views

What do current generation firewalls lack?

Are current generation firewalls ( both commercial and open source) good enough to combat current generation attacks (of course when properly configured) ? By large , what do current generation ...
3
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3answers
2k views

How can reverse proxies be used to bypass acceptable use policies of a company?

I am wondering how reverse proxies can be used to bypass company acceptable use policies? What can be done to prevent it?
4
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5answers
415 views

Why wasn't the flame malware flagged by firewalls?

Why didn't any firewalls catch the flame malware siphoning out all of that data? I thought there was firewall software that looks for "suspicious" activity?
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2answers
109 views

Should a host based firewall have an API accessible to other applications?

Some people are hesitant to use Windows Firewall because it allows software to alter its state via an API. The benefit of this is that the Firewall configuration can be centrally manged in GPO. On ...
0
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2answers
1k views

Enabling firewall for the IPv6 tunnel on Windows 2008 64-bit

I am currently on a IPv4 network. The IPv4 network is accessed by a router, which gives my machines IPv4 addresses via NAT. On one of the machines, a Windows 2008 64-bit machine, I have set up a IPv6 ...
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votes
1answer
995 views

Linux tools to choose suitable Cisco ASA 5500

I have a linux webhosting server which affects a high DDOS. I want to use Cisco ASA 5500 Series Adaptive Security Appliances to protect the linux server from this DDOS. I know there are many factors ...
4
votes
2answers
699 views

Configure Linux to allow network activity based on binary?

On Windows, rules can be added to the firewall to allow/deny network traffic based on which binary is sending/receiving the data. Can this be done on a Linux box, and if not, why not? Is it a bad ...
1
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1answer
2k views

How do these Windows services affect the security of Windows Firewall?

Its common to disable unneeded services in Windows 2008 R2, but sometimes I come across installations that use Windows Firewall and related services. More info: see service dependencies for Windows ...
0
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1answer
723 views

Securing firewalls for XAMPP on Mac OS X

I've recently installed XAMPP on my Mac OS X 10.6.8, and this has caused me to reevaluate how I have my firewall setup. Right now I am using the two firewalls that came pre-installed on my computer: ...
3
votes
3answers
9k views

Config Server Firewall: What Outgoing ports need to be open for wget and apt-get install?

I am just configuring CSF and I have to specify my outbound ports here. I am trying to close as many as possible leaving only what I need open, however what do I need to leave open for wget? # Allow ...
8
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5answers
14k views

How to trace a DDOS attack on a dedicated server and block it?

I have a dedicated server and I'm hosting a game, and the web page (using Apache) for account registering. The server is being ddosed since 8 months ago till today. I've tried to talk with the server ...
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2answers
233 views

Correct way of establishing if the switch is sending syslogs?

I want to confirm through scanning means if the switch is sending syslog packets or not. What i did was run a nmap scan nmap -sV -p514 xxx.xx.xx.xx The result came out as closed. Does this ...
0
votes
3answers
675 views

An alien packet from the switch shut down my ethernet card when using nessus?

I'm stuck in between a very bad cocktail mix of two very desperate technologies. One is Nessus and other is a Juniper EX2200. When I'm running the two together, the NIC on my HP MiniTower 6200 Pro ...
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2answers
2k views

IP Spoofing a threat?

Quick Security Question if i may. We have an internal Intranet system which is only accessible from a few internal vlans, our main external firewall blocks all access to the internal webserver – or ...
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2answers
281 views

Can I connect our network to the internet but only allow connections to certain servers?

At work we have a network that is not connected to the internet however it is exposed to the outside work through USB drives and employees cell phones. I'd like to connect our system to the internet ...
2
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1answer
248 views

Maximum protection on a computer network?

I would like to secure as much as possible a computer I am using to sync sensitive data files from work to my home pc. The syncronisation is being done by only 1 software is there a firewall to allow ...
3
votes
2answers
1k views

Reviewing IP(s) that has been blocked by firewall / router

Is there a best practice on how to review IP(s) that are blocked on firewall / router and determine if they are safe to be removed from banned list? Occasionally, the firewall guys see a high counts ...
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2answers
1k views

Firewall audit log management tools [closed]

is there any free or open source tools that is able to collect audit logs from firewall in syslog format for monitoring purposes? There is 2 firewall in my organization and I would like to track ...
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2answers
1k views

Open Source tool to block email attachments

Is there any way to stop users from sending attachments over Gmail or any web based email including private mail servers, if internet access is through a Linux box running Ip Tables/Squid etc. We are ...
0
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0answers
20 views

What are some real world examples of screened subnet firewall architecture? [duplicate]

Possible Duplicate: Public DMZ network architecture screened subnet firewall architecture has a DMZ the outisde world doesnt know about the inside network beyond DMZ and inside doesnt know ...
10
votes
1answer
3k views

ports blocked by firewall and not the server

I was asked this question at an interview and i wasn't sure about the answer. The question was "suppose you were checking the open ports on a particular webserver which was behind a firewall, how ...
3
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2answers
616 views

1 PIX firewall, 2 routers, 2 switches. Please answer a couple questions about hack lab

I bought a bunch of cisco equipment for a project and I got 1 PIX firewall 2 switches and 2 routers This is my plan for a topology but I am new at this so I need help. I am basing this off the ...
25
votes
4answers
11k views

Dangers of opening up a wide range of ports? (mosh)

Why do we generally configure firewalls to filter out all traffic that we don't specifically allow? Is this just an extra layer of security for defense-in-depth that buys us nothing if we are not ...
21
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12answers
48k views

Public DMZ network architecture

Years ago, when I was a student, a network security professor taught me in a class what a DMZ is. The architecture he used in his slides was similar to this one: Now that I got employed, my boss, a ...
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2answers
7k views

How secure is blocking all incoming connections on my ADSL or cable router?

My router, an up-to-date ADSL Fritz!Box 7340 router with a fixed leased IP address, has been configured to block all incoming traffic. Assuming, for the sake of argument, no extra security is ...
0
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1answer
1k views

Router with good Firewall for office - total of 50 computers/devices including wifi devices [closed]

I am looking for a good Office Router that can handle good firewall rules, have logs, and ca support about 50 computers/devices connected with wire and wireless. We had different models before, and ...
2
votes
2answers
324 views

How to use an old PC as a firewall on a tight budget?

I'm doing a degree in network computing and am currently working on my dissertation right now. I am not an expert with networking yet, so I'm kind of struggling to get started with my topic that I've ...
2
votes
3answers
10k views

What, specifically, does the Windows Firewall do?

My understanding of the situation is that, when the Windows firewall is off, every port on the computer (all 65535 of them) is fully open. This means that any application running on the computer can ...
8
votes
3answers
7k views

Block all BotNets and TOR addresses from accessing our site

I've heard that many DOS attacks and general "black hat hacking" attempts occur over the TOR network. Is it possible for me to dynamically block source IP's by their presence in a BotNet or similar ...
1
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1answer
1k views

Open source firewall with multi wan support [closed]

I use smoothwall express and also used IPCop. But now I need to have multi WAN support as I want to use a DSL and Cable internet connection together to increase my speed, specifically upload speed. ...
7
votes
3answers
11k views

Why do I need a firewall on my router?

I just bought a new router, and as usual the router manufacturer make a big deal out of the firewall. I have never understood why the firewall is needed, sure, stopping dos attacks (such as syn-...
6
votes
4answers
572 views

“There's a firewall on the router into the building so you can turn the one on your computer off”

I know some people that, in regards to network security, argue that because the firewall on the router into the building is on, that makes the network secure and therefore, the firewall on Windows PC'...
3
votes
1answer
2k views

w00tw00t.at.ISC.SANS.DFind iptables fix - abusable?

It's only an idea. I've recently logged that my server is scanned by w00tw00t tools. I found many solutions to this, such as use of apache mod-security, fail2ban, etc.. The one I want to speak about,...
2
votes
1answer
637 views

Large lan party : How to identify the users on the network?

I would like to know what are the good way to identify users on a large lan party when you manage network ? I had the idea to make the users register them self at a desk, they give us Firstname, ...
4
votes
3answers
4k views

Which of these ports are safe to leave open, which are not?

I just ran nMap against my IP address and got the following result: PORT STATE SERVICE 21/tcp open ftp 22/tcp open ssh 23/tcp open telnet 80/tcp open http 443/tcp open https 3389/...
3
votes
1answer
2k views

How can I find the process that is trying to use smtp to send email?

Previously I asked Who (which process) is calling curl? and I got very good answers (this answer in particular) which basically replace the curl binary with a shell script that logs each call to curl ...
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2answers
6k views

What needs to be done on a Citrix Netscaler to protect from SSL Renegotiation attacks?

I'm under the impression that the TLS/SSL renegotiation hack has been fixed. I'm not sure if the software has to be deployed on the server side, client side, or both. Based on this blog, TLS ...
2
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1answer
210 views

Firewall Considerations with PGP Universal

The PGP Universal server is a fairly complex piece of work that provides several different services. When constructing firewall rules I am trying to determine what implications there are for opening ...
0
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1answer
905 views

Cisco PIX SNMP enabled or not?

On a Cisco PIX firewall, I wanted to check if SNMP is enabled: pix# sh snmp-server no snmp-server location no snmp-server contact snmp-server community public no snmp-...
5
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1answer
1k views

Why ESTABLISHED,RELATED for INPUT only?

In many places and tutorials I see people add this line to their iptables: -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT And they do it only and only for "INPUT". What about OUTPUT and ...