Questions tagged [network]

Security of network infrastructure and network traffic. For questions about security of network equipment, topology, protocols, traffic, administration, and configuration. Related tags: [packet], [firewall], [network-scanners], [network-access-control].

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11
votes
5answers
3k views

Can voice chat be spied?

I wonder if voice chat (via public services like yahoo, google talk, skype, etc) is practically secure? Is it possible for the ISP or any middle point? I do not consider hacking the computers, but ...
11
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6answers
21k views

Automated tools for Cisco IOS config auditing? [closed]

Are there any automated tools for auditing config files exported from Cisco IOS devices? Free/Open Source is always nice, but anything that does the job would be of interest.
9
votes
2answers
17k views

sniffing/recording GSM 3G signals

Is it possible to sniff or record and process GSM 3G signals (from some reciever) given that there is no other signals interrupting etc (the most comfortable conditions) Update (with some supporting ...
8
votes
2answers
619 views

What features do you look for in an Enterprise Log Management solution?

This question is for IT Pros, and people who manage a company's infrastructure. Developers should see this related answer for tools geared for them. What are your requirements for such a Event Log ...
8
votes
1answer
18k views

How can I get the IP address for a Tor Hidden Service (HS) with a .onion address?

I'd like to find out the IP address of a given .onion address. Is it possible for me to simply assign an exit node (that I control) to my client and just monitor it to determine what IP address ...
12
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5answers
21k views

Can Skype chat be protected from snooping? Are there safe alternatives?

I use Skype a lot. With all of my clients, staff, contractors and friends, however, the acquisition by Microsoft worries me, as two of my clients are direct MS competitors, and I often work on long ...
7
votes
6answers
36k views

Is there any solution for block the HTTPS traffic using URL filtering?

The URL filtering can block the HTTP traffic but not the HTTPS traffic in Internet Explorer. For example, the website http://www.facebook.com is blocked by the URL filtering while the https://www....
14
votes
3answers
19k views

Pros and cons of disabling TCP timestamps

So, lynis informs me that I should unset net.ipv4.tcp_timestamps. I know that's a bad thing because an attacker could figure out which updates that require restarting the machine I haven't applied, or ...
11
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2answers
2k views

Malware known to use port knocking to evade detection by network scanners?

Are there any known cases of malware in the wild that utilize port knocking on a backdoor to evade detection by network scanners?
11
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3answers
19k views

How to protect myself against paid DDoS services?

I am domestic user and I am getting attacked regularly by a guy that hates me. Here is the background story: that guy uses Skype resolvers (tools offered by paid DDoS services) to find out my IP ...
11
votes
3answers
30k views

When do I use IPsec tunnel mode or transport mode?

I basically understand how tunnel mode and transport mode works, but I don't know when I should use one instead of another. Among the two parties who want to communicate, if one computer B doesn't ...
9
votes
2answers
9k views

Need help identifying the OSX process that's generating strange network traffic

Since the past few days, I noticed that my router was a bit slow, and was restarting itself at times. When looked at its logs, they had entries like: Friday Jul 13 13:09:02 2012 1 Blocked by DoS ...
5
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7answers
155k views

How to effectivily block torrents on my network?

As per the network policy, we have to block all torrent traffic from the network. To do this, I used to block all ports above 1024 on my firewall/proxy devices. But due to this, many other ...
12
votes
1answer
6k views

Is WPA2 WiFi protected against ARP poisoning and sniffing?

Is WPA2 WiFi protected against ARP poisoning? If not, can the ARP poisoner decrypt the packets?
4
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2answers
3k views

What is more secure: ISDN, Cable Modem, DSL, T1, etc…?

This discussion came after showing a friend this Security.SE post regarding DNS attacks, and after reading about a Cable Modem MITM attack. Given the current options available to consumers, what ...
3
votes
2answers
1k 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
votes
1answer
1k views

Does the carrier network autheticates itself to the SIM card?

From my understanding this is how SIM authentication works: When the mobile device starts up it obtains IMSI from the SIM card and send it to the operator network Operator network finds the Ki(128 ...
2
votes
1answer
1k views

Is it as easy to crack a wifi password, as shown in the video?

I was browsing YouTube and I came across this video In the video they show how to crack the password of a wifi using CommView, Aircrack and Wordlist. According to the video it takes about two ...
11
votes
1answer
3k views

Bypassing hidden SSID and MAC filtering “protection”

I was browsing over this question and had some follow up questions from a practical perspective. What tools will show the SSID of an AP with the SSID set to hidden or broadcasting disabled? I have ...
11
votes
1answer
2k views

How secure is the apt-get install command against man in the middle attacks

I think the title says everything, how secure is it to use apt-get in a network with an attacker who injects his own packets and blocks the original packets (man in the middle).
11
votes
4answers
11k views

How to break MAC address filtering?

If a MAC filter prevents you from connecting to a network, how can you break it or include your device's MAC in that filter?
10
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3answers
3k views

Can an infected phone infect other computers in a network?

Can an infected phone infect other computers in a network? For example do you need to worry about private phones in a company enviroment? Or is that already paranoid?
9
votes
4answers
111k views

Unknown MAC address connected to router

I found an unknown MAC address connected to my home router. How would I figure out what OS the IP or MAC address is running?
8
votes
3answers
10k views

Advantages of separating Web server from Database

What are the security advantages of installing the database of a web application on a server other than the one containing the web server?
7
votes
1answer
1k views

How to get hold of and use WPA session keys?

I'm testing sniffing and decrypting my WPA2 wifi network traffic. But when using airdecap to decrypt the capture file (created by airodump) using my WPA passphrase I only get broadcast traffic. If I ...
6
votes
3answers
3k views

Is it possible to catch a virus on my LAN without clicking on anything?

My unpatched PC running Windows is connected to a network which contains other "infected" computers, can I get infected by viruses without any interaction on my part?
5
votes
1answer
2k views

Can I isolate a specific computer on my network?

My brother gets malware infections practically every week. Apparently he had a infection over the past 24 hours, I only noticed it because I checked the router logs and saw a massive amount of network ...
5
votes
1answer
2k views

Is it possible to successfully send a spoofed UDP header with a completely unrelated source IP?

I've read that many networks use ingress/egress filtering to eliminate the number of spoofed UDP packets sent and received by their network. Given that network provides have been much more diligent ...
4
votes
4answers
2k views

How much of a risk to students is an open WiFi network on campus? EDIT: please read in full.

I've been battling bureaucracy at my community college for months on this issue; a few months ago, they changed security on the SSID for students; It used to use EAP, allowing students to enter their ...
3
votes
2answers
5k views

SSL Finished message contents

I'm a little bit confused about the contents of Finished Message used during Handshake Protocol. In particular, this message (clientside) contains the connection-id originally sent from the server and ...
3
votes
1answer
359 views

Does having a VPN service mean accessing my email etc. over public free open WiFi mean I have security/privacy? [duplicate]

Is my information secure over public WiFi if I use a VPN service? i.e. protection of emails and login details.
3
votes
1answer
3k views

If I connect to VPN through proxy, who can see what?

I try to understand what happens when I use an HTTP(S) proxy in my OpenVPN client configuration. What's the advantage of an HTTPS proxy over plain HTTP? In any case the encryption takes place on the ...
2
votes
3answers
520 views

How to prevent an infected PC from infecting other machines on the same network? [duplicate]

My father is pretty careless about his security and this is not new. He even said to me that in the last year he used Tor to access some links just for curiosity because he read about it in some news ...
2
votes
3answers
1k views

Local AP - Outside Router MitM Attack?

Let's say that we have our computer inside the local network. Our local network is connected to the Internet by AP+Router that connects to the router in other network which is connected to the ISP. ...
1
vote
2answers
4k views

How to check if a port can be accessed from the outside

I want to be sure that the firewall protecting the intranet is effectively rejecting/granting access to a port. I have no access to the firewall nor any other external machine. Is that possible at ...
0
votes
4answers
38k 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 ...
0
votes
5answers
6k views

Monitor websites being visited on network

I need to monitor the websites being visited on my wifi network by the different IPs connected to the network. What is the best way to do this? I spent some time with Wireshark but I feel it is a bit ...
20
votes
3answers
7k views

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

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 ...
14
votes
1answer
2k views

What's are the advantages of L2TP/IPSEC over plain IPSEC?

As the title says, my firewall (Sonicwall) can do either IPSEC or L2TP/IPSEC for VPN connections. One advantage of L2TP/IPSEC I can see is that the client computer get allocated its own IP address on ...
12
votes
2answers
7k views

Obtain credentials by spoofing WPA/WPA2 Enterprise network?

I have a large scale wireless network secured using WPA/WPA2 Enterprise authentication. Recently, I was made aware of the possibility that someone may use a dd-wrt router and a computer to spoof the ...
7
votes
1answer
780 views

How can IoT and other network devices access the internet if my router works as a firewall?

My understanding is that routers act as natural firewalls. In that context, how can an IoT device receive commands from the WAN if they are not initiated from within the LAN? In a specific example, ...
6
votes
4answers
52k views

Can viruses transfer from phone to computer over the network?

I don't know if this is the right place to ask but I heard that adult websites (porn) had viruses. I used to look up porn on my iPhone (I won't anymore) and I understand that there aren't viruses for ...
6
votes
3answers
2k views

Cannot identify or block unknown MAC addresses

I've only got a basic idea about networking, Google is my teacher. Router: Tenda D303 Location: India Connection: BSNL Unlimited 1Mbps broadband. Friends and relatives visit me often, and connect to ...
3
votes
3answers
1k views

Meterpreter shell and system shell define?

What is the difference between Meterpreter shell and system shell? For example, if I found some vulnerability in a system which allowed both shells, then what should I go for, system shell or ...
3
votes
3answers
638 views

Without SSL, what vantage point does one need to MITM non-SSL'd HTTP?

OK, so there are two things here: being able to read the content of the requests and responses, and then being able to modify them. The former may depend on the latter, I'm not sure. But basically, ...
2
votes
3answers
2k views

How can alleged illegal downloading be detected?

Joel Tenenbaum was accused of illegally downloading 30 songs. How might his action have been detected? Can anyone show a concrete method? Update Using a honey pot or monitoring the peers list makes ...
1
vote
3answers
109 views

Phishing attacks with two factor authentication

Making our own phishing page isn't a big deal. Copying source code from website and modifying link just does our job. But what if we want to add phishing page for 2FA in the same code? Consider the ...
1
vote
2answers
341 views

Public key - private key question

I have a query about public/private key encryption that I hope someone can answer. So as I understand it: Client connects to server and server responds with certificate Client pulls the public key ...
1
vote
5answers
909 views

“Safe” public WiFi [duplicate]

Is there any danger of any of my computer's files being read or changed (mainly - infected by malware) in the following scenario (I'm using Windows 7): I have file sharing turned off (in "advanced ...
1
vote
3answers
14k views

What information can my network admin see when I visit a website? [duplicate]

This question is similar to this but for my network admin. For example, when I enter this URL: https://www.google.com/search?q=example or ... I can see the word example that I was searching on ...

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