Network Security - securing network infrastructure and connections

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2
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2answers
167 views

How much information can be gathered about a network without connecting?

I'm working on a project that ideally needs to be able to identify local wifi networks, and be able to recall them if they are approached again. Is there any unique identifying information that can be ...
2
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3answers
4k views

DDoS on LAN: How to Defend?

DDos on a wired network has to be extremely rare, since the intruder has to be physically connected to the network. However, let's say that it still managed to happen. How would you be able to defend ...
2
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2answers
4k views

how to identify p2p on network

Im trying to work out if the traffic in the below image is P2P file sharing? If you notice the source ports are all random but the time 17.24 from c.port 58338 runs for a good length maybe about 400 ...
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2answers
3k views

Is it possible to change the admin user/password remotely on a router without logging in?

Is it possible to change the admin user/password remotely on a router without logging in? If yes, how so?
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2answers
83 views

Is it Safe to Send an Invalid Password Back to the Client?

It is common for websites to remember the username input value after an invalid login attempt but not the password input value. Take SE for instance. When I attempt to login with an invalid password: ...
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2answers
1k views

What information can be gained from an Email Header?

What information is present in an Email Header that can be used to track a sent mail? For example, are some of these present? Web Browser used? Operating system Type of Network (broadband/dial up)? ...
1
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2answers
389 views

Isolating guest networks

I'm setting up a secondary guest wifi on my router and I want to make sure that it's impossible for clients connected to the guest wifi to access my primary network. Initially, I used IP filtering ...
0
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2answers
143 views

Only HTTP(S) port is open. Why do I need to worry about unpatched software?

Unpatched software poses no risk by themselves. They're only problematic when someone exploits it. How could malware get into my system if I do have unpatched software in general and I'm connected to ...
0
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4answers
239 views

Basic question about why it's useful to have VPN encrypt traffic

There may be a basic flaw in my understanding of how the internet works so sorry if this is a simple question. What type of attack does VPN protect against? For example if a local area network (let's ...
-1
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4answers
2k views

How to find out if somebody is spying on my private browsing data in the same WiFi network? [closed]

I live in a hostel and eight people including me, are using the same WiFi network. One of my friends is a "computer wizard". I would like to know if he is secretly checking my browsing history and ...
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1answer
228 views

Viable way to ruin a milk corporation? [closed]

Hack into their system and change the "Sell by" date so that it is immediately bad. How long do you think until they notice, if you pull it off?
19
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3answers
3k views

What are the risks of using a CDN to speed up my website? How do I avoid them?

Content Delivery Networks (CDNs) are well known to speed up the performance of a website, but they create the obvious security risks if someone were to change the code that resides on the CDN. What ...
12
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3answers
979 views

Are there valid reasons for spoofing an address?

This is a corollary to the question Why don't ISPs filter on source address to prevent spoofing?. Are there valid reasons to spoof an address?
11
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4answers
5k views

Is NTP vulnerable to DNS poisoning or spoofing attacks?

Scenario: Attacker somehow compromises the DNS lookup for the NTP server used by the victim (a web application) Victim sends DNS request for e.g. ntp.pool.org, which is responded to by attacker to ...
9
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3answers
824 views

How did the spammers get this address?

A few months ago I configured a test mail server on Amazon AWS, all legit. I used a new address to my catchall-domain (something similar to, but not exactly, ...
7
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2answers
8k views

Securing remotely accessible IP cameras that do not support HTTPS

I have some IP cameras set up on my home network, which is WPA2 protected. These cameras are setup to be accessible from the Internet thru my router's DDNS address, and port number. So for example, ...
7
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6answers
309 views

Why shouldn't I run other applications on a Firewall?

If I want to use Ubuntu 11.04 as a Firewall in SOHO environment, then I just can't figure out what is the bad thing about installing GUI on it (e.g.: XFCE)? The only opened port to the world (wan ...
7
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3answers
531 views

Popularity of Anomaly based IDSes

I've been reading quite some time about anomaly/behavior based IDSes for Web servers. I understand the downsides: possible high false positives, learning phase, constant training. My question is how ...
5
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2answers
2k views

How can I use nmap to distinguish between a normal linux machine and an android device?

According to this link: here, nmap 5.2 onwards is now supposed to detect android smartphones. I am using nmap 6.01 but it only identifies android devices as running a linux kernel.
5
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4answers
7k views

Preferred UAC configuration in Enterprises that use Login scripts to map drives

In Windows 7, Vista and newer OS's, UAC will prevent logon scripts from mapping hard drives so that the following logon script code won't work: Dim WshNetwork Set WshNetwork = ...
5
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1answer
3k views

Is indirect access to a computer as bad as direct?

I'm deploying a web-based ERP system for a customer, such that both the server and the client machines will be inside the customer's intranet. I was advised not to allow the server machine to connect ...
5
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2answers
3k views

incoming packets in server

I have enabled iptables logging for packets coming from the outside -A INPUT ! -s 192.168.218.0/24 -j LOG Now i am seeing lots of incoming packets from unknown addresses Jun 5 14:54:56 localhost ...
5
votes
3answers
548 views

Is there a way to identify the host of a malicious VM from across the network?

Scenario: Someone is attacking your network. However, they're not exactly using their machine to do it - they're using a VM running on their system. The VM's network adapter is configured in ...
4
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5answers
3k views

How can I find the source of traffic allegedly originating from my IP address?

I have a problem that has been going on for at least 6 weeks. I have Time Warner for my Internet provider and some websites hosted at GoDaddy. From what GoDaddy tells me the reason I can not view ...
4
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3answers
4k views

Opensource NetFlow generator

Cisco routers are able to generate NetFlow flows that can be captured and then analyzed in order to manage what is going on on your network. Unfortunately, I don't have a Cisco router in my toolbox so ...
3
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1answer
391 views

Forensics - trace back DNS query origin on host?

So I tried to search the web for answers but didn't find any. Is there any way to trace back which exe file or application caused the computer to make a specific DNS query?
3
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1answer
336 views

Secure Connection between two mobile (Android and/or iOS) devices

I've a Device A which will communicate with multiple devices on a network (BLE and/or NFC). All the devices will be handled a Token upon authentication which somehow needs to be transferred over to ...
3
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2answers
2k views

Closely spaced failed logins in auth.log

I have a raspberry-pi (running GNU/Linux) and I recently allowed my router to forward port 22 (ssh) to the raspberry-pi so that I could log in while away from home. I then noticed a bunch of ...
3
votes
1answer
10k views

House owner can see who's connected to WiFi; what more can he see?

I live in a rental house, and use the house-owner's wireless network to connect to the internet. The owner can see who is connected to his wireless network and I had a few questions regarding this ...
3
votes
1answer
657 views

What is known about the sirefef/zeroaccess malware/botnet?

There appears to be an increase in p2p communication among botnets that has been attributed to the sirefef/zeroaccess malware botnet. What is known on this particular threat?
3
votes
1answer
820 views

Filtering network access on a user/group/process basis

I am interested in peoples thoughts on what the best approach would be to controlling access to network interfaces at a user/group/process level for a Linux based host. The scenario I have in mind is ...
3
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2answers
593 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 ...
3
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4answers
412 views

What does a switched network protect us from? What does it not protect us from?

There seems to be some misconceptions regarding what a switched network will protect us from, and what technologies/precautions a secure environment requires when segmenting trusted users from hostile ...
2
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1answer
18k views

How much can someone see from my iPhone by connecting to my wifi

How much can someone see from my iPhone by connecting to my wifi and can they copy my messages files documents etc
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3answers
2k views

Identify a process that uploads data

I am using the tool "Internet Traffic Agent" to monitor my in- and outbound traffic. It shows me clearly that over a period of approx. an hour, some process on my machine is uploading data, about ...
2
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2answers
61k views

Router admin password was changed, how did this happen and how to prevent [closed]

Internet was extremely spotty for about a week. I was on/off cycling the cable model and router almost daily, before I tried to sign into my router (198.162.1.1). When I did I was presented with a ...
2
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3answers
494 views

Repudiation in Copyright Infringement (BitTorrent)

Seeing this question : How can alleged illegal downloading be detected? sparked a question I have had for a long time. How does repudiation/non-repudiation work in such cases ? Argument: It is known ...
2
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2answers
225 views

Has networking using multiple “unrelated” connections to share an encrypted data stream been researched?

I'm not exactly an expert, so I'm hoping you'll give me the benefit of the doubt and try very hard to make sense of this... I've been thinking about a simple measure, which I'll call Multiple ...
2
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1answer
242 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 ...
2
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1answer
6k views

What are SSDP notify requests and where can I find out exactly what this traffic is?

What is a SSDP protocol request with notify http/1.1 ? How can I find out what this network traffic is?
2
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2answers
259 views

Which private-key encryption should I use for server to server communication?

I am tempted to write my own which covers: Checksum to ensure data is not tampered with. Long and multiple rotating keys so that it is (practically) impossible to decrypt. Will use /dev/random for ...
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2answers
123 views

How to secure Epson Beamer?

I work in a school and we have several Epson Beamers but some of our students have download an application for their mobile (with infra-red and WiFi connection) and they now have remote control and ...
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2answers
136 views

Shared Database and PCI Compliance

Say we have a cloud based web application which is SaaS. This application is to be made PCI compliant as a service provider, as client card data passes through the application. This application uses a ...
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3answers
1k views

Could a neighbour see my traffic when we have cable Internet?

Is it possible that a neighbour could see my traffic (*), when we both have cable Internet? Or: Under which conditions might this be possible? I would assume, "Never!", but after reading these two ...
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4answers
409 views

Learn about network and security for securing a server

I'm setting up an OpenBSD server that I want to connect to the Internet (it's going to be used to host a site - so, with Apache, SQLite and the like). I want it to be as secure as possible. Social ...
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1answer
1k views

syn flood size per second

Given the size of a TCP packet is 60 bytes, there is a SYN Flood attack on a computer made ​​by a 100 Mb bandwidth, the question is how many syn packets are sent in a second? Is there any formula for ...
1
vote
1answer
250 views

Can accounts still be logged onto if Password Caching is not enabled?

This is kind of an extension of my other question.. If you were not storing any of the passwords locally (caching disabled), would a user some how still be able to circumvent around this security ...
0
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1answer
115 views

Starting a new job after working at home for years. How to best protect data, secrets, and privacy in the workplace?

I have just started interviewing for new computer job after years of working from home. At home I feel very secure with how I protect myself from data loss and keeping my secrets secure. I backup ...
0
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1answer
2k views

Dual Firewall DMZ

We've just learnt about firewalls and DMZ and I'm struggling to understand how are these actually implemented ? The architecture we've learned was something like this: Let's say that we have a ...
0
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3answers
723 views

Why there are uninvited incoming packets to my ADSL connection?

To verify this, I boot my PC from Kali Linux live distro. Before establishing ADSL/PPP connection, I start Wireshark and listen on any pseudo device. Then I create the connection to ISP network. ...