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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14
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4answers
48k views

Detecting(and locating) rogue DHCP server on a local area network

How would we detect and locate a rogue DHCP server on our local area network?
14
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2answers
21k views

Is it possible to use the aircrack-ng tool to crack a WPA2 Enterprise network?

is this tool (aircrack-ng) capable of cracking into a WPA/WPA2 Enterprise network? This tool has major success cracking the passwords of WEP/WPA networks. If it can, how, but if not, is there another ...
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1answer
1k views

Are there any security problems with Google false start for TLS?

Google recently announced false start in Chrome browsers which increased TLS performance by 30% http://news.softpedia.com/news/Google-Chrome-s-SSL-False-Start-201253.shtml I know TLS has been poked ...
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3answers
3k views

Is a predictable MAC address a risk?

If you knew from the public internet that a certain IP address belonged to a machine with a certain MAC address, can you see any security exposure associated with that? I know that some software will ...
14
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1answer
33k views

EAP-TLS vs EAP-TTLS vs EAP-PEAP

I'm having troubles understanding the differences between the 3. As far as I understand, with EAP-TLS, the client (peer) and the server (authenticator) both need a certificate. The authentication is ...
14
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2answers
4k views

Viewing the stack

I recently started learning about buffer overflows and how they work. Someone shared a binary to practice on (in a vm, don't worry). I've been feeding strings to the socket that the binary opens, and ...
14
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2answers
5k views

Is IP spoofing relevant to TCP? Is it relevant for TLS or SSH?

I have read the TCP Connection Establishment on Wikipedia In brief the packets to start are SYN, with a (hopefully) random sequence number A from the client. SYN-ACK, responding, with A+1 and (...
14
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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 ...
14
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2answers
863 views

How does the Copyright Alert System work? Who has implemented it?

Some ISPs are participating in a Copyright Alert System that notifies content authors of violations of their copyright. I'm concerned how this oversight relates to my private traffic, and what laws ...
13
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8answers
3k views

Randomizing MAC addresses on bootup

Since it is possible to set custom MAC addresses, wouldn't it make sense to have a new one as often as possible/convenient (i.e. on bootup)? It would seem that is useful to both attacker and victim (...
13
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4answers
19k views

How can I keep a roommate from seeing my web activity?

I have a roommate who is a network security engineer and I think he hacked our home network and now knows what sites I am visiting and what I am doing online. Although he is not stealing anything I ...
13
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2answers
3k views

Is this a secure data exchange scheme for a game?

I am writing a multiplayer game. I have a central server which processes everything. For data exchange I use HTTPS protocol. Because this is a game I cannot use computationally expensive systems like ...
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3answers
10k views

Can IT see my Google Drive traffic? [duplicate]

I'm on my phone but on the work network. What could they see about my Google Drive traffic? Could they see folder and file names? Could they see documents and photos? It's encrypted, so would they ...
13
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1answer
4k views

Is my iPhone being targeted by the US Department of Defense?

Below is a screenshot of a text message my mobile device received within the past hour. It contains the text "6.216.198.5:8006/Y/0329235420500012000110000" from the number "1111301000". I am curious ...
13
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3answers
1k views

Would publishing a network diagram make the network less secure?

I have found some social networking sites that focus on sharing architecture (network maps and diagrams) and configuration. Does sharing this type of information decrease the security of my network? ...
13
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6answers
5k views

How can mini-computers (like Raspberry Pi) be applied to IT security?

It's no secret that thousands of $35 Raspberry Pi (Model B) computers have just shipped to people around the world. With these, and other similar types of computers becoming cheaper and more available,...
13
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4answers
10k views

Looking for botnet IP address feeds to protect against DDoS

I would like to get a live feed of botnet IP addresses delivered from a service and block them under certain conditions. Preferably community based/open source but open to looking at worthy commercial ...
13
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7answers
4k views

Egress filtering on an office network?

With an office network most companies will use ingress filtering to add a level of security, however few take advantage of egress filtering to protect their networks. The use of egress filtering will ...
13
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1answer
2k views

Native rsync protocol security

Is the native rsync protocol (port 873) secure? Does it encrypt data or credentials? I'm planning on using rsync to store encrypted files in the cloud, I'm wondering whatever the password is ...
13
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2answers
15k views

How can someone hack my PC if I am connecting to the internet through NAT?

If I own a private IP address, 192.168.2.1 for the sake of it, and I am physically connected to my router, which it's internal interface is 192.168.2.254 and it's external interface is some public IP ...
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2answers
4k views

Bypassing a reverse proxy/NAT

Reverse proxies and NAT would seem to obscure a network behind such technologies to the point where it would be hard if not impossible to identify ports open and services running. Given that many ...
13
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1answer
1k views

What happens inside of a DDoS Scrubbing Center?

I understand, that traffic is redirected to a scrubbing center during a DDoS to differentiate between malicious and legitimate traffic as has been explained in this post. However, from a technical ...
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4answers
45k views

How does Team Viewer establish a Remote Desktop Connection?

I am wondering how is it possible for Team Viewer to establish the remote desktop connection over the internet even if the user has not enabled the 3389 port ? I am searching over the internet but ...
12
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5answers
43k views

Multiple VPN clients in parallel

If I were to run more than one VPN clients on my machine, simultaneously, what risks would be involved? E.g. are there technical conflicts, such that it wouldn't work right? Could there be ...
12
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3answers
902 views

Is secure Caller ID possible for SIP / VOIP?

Is there any way (standard, proposed or draft) that will allow for secure Caller ID over SIP / VOIP networks? I have constantly heard that Caller ID is insecure when used over these services. Can ...
12
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4answers
8k 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 ...
12
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5answers
19k views

How to detect hosts running in virtual machines with nmap?

I have to determine if a given subnet has virtual hosts. Are there any ideas about what switches to use?
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7answers
2k views

Is an IP address blacklist good practice to prevent website attacks?

My website has a blacklist of IP addresses. The web application, in some way, detects all invalid, suspicious influences to it and remembers IP address and denies any requests from that IP address. ...
12
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2answers
29k views

Are open ports dangerous?

I have forwarded port 80 to WAMPServer and 25565 to the MineCraft-server running Bukkit. Am I vulnerable to attacks. Can hackers attack me if WAMP-server is running or if it is not running, or will ...
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 ...
12
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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?
12
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5answers
2k views

Powerful security tools to use in penetration testing

I want to ask you about some good security tools you've used or heard about, please let us know the ability in every tool and the difficulty to use it and which is the best situation to use this tool ....
12
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3answers
10k views

Whats the difference between an evil twin and a rogue access point?

I'm having a hard time to understand the difference between a rogue AP and an evil twin? I've spend some time searching for it but I don't understand it fully I think. Is it pretty much the same thing ...
12
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3answers
733 views

Verifying server software integrity?

I'm trying to brainstorm a security scheme for the problem of verifying server software integrity. The domain of this problem is Game Servers built on Valve's Source Dedicated Servers. These servers ...
12
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3answers
9k views

Is it possible to speed up WPA/WPA2-PSK cracking using a rogue AP?

We know that WPA/WPA2-PSK uses a PTK (Pairwise Transient Key) for each client to encrypt the communication. This PTK is generated through the process known as 4-way handshake. As told in the related ...
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2answers
1k views

What is a “pre-play” attack?

I understand what a replay attack is, but I keep reading about a pre-play attack. What is it? Is it when someone intercepts an unused message and blocks the sender so they can't finish using it, and ...
12
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4answers
1k views

Wireless Activity Monitoring for PCI DSS Compliance

In an effort to be PCI DSS compliant, I took a trustkeeper.net questionnaire. I failed the question that asks: Is the presence of wireless access points tested for by using a wireless analyzer at ...
12
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2answers
432 views

Using Single Domain Name to Identify Multiple Servers Improves Security? (Google's use of 1e100.net)

Since 2009, Google has been using a single domain name to identify its servers across multiple products: Following standard industry practice, we make sure each IP address has a corresponding ...
12
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2answers
16k 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 ...
12
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3answers
15k views

How to best set up public WiFi without giving access to the rest of my network?

For reference, this is just for my home network. Anyway, I have quite a few of my neighbors ask me to share my internet with them. I'd really like to eliminate this "here's the password" portion ...
12
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2answers
3k views

How are mobile telephony networks like LTE and HSPA encrypted?

How are mobile telephony networks like LTE (4G) and HSPA (3G) encrypted? between what parts is the communication encrypted? who has access to the keys? is symmetric or asymmetric encryption used? is ...
11
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3answers
4k views

How you can trust your Router to not steal your private IPSec keys?

I would like to connect to my VPN using IPSec protocol. For that, I need a router or any other device that support it. I found this on eBay: https://www.ebay.com/itm/IPsec-VPN-server-military-secure-...
11
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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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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
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3answers
27k views

How to get MAC addresses of devices which are not in the network

Can I get MAC addresses of devices (mobile phones) which are near to my network but not connected to it? (Linux) I have been trying to get the MAC addresses of devices connected to my network through ...
11
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2answers
28k views

How to be safe from wifikill!

I recently found that my friend is using wifikill apk on his rooted android and I would like to get rid of that software as I always get kicked from my wifi. I have to give him the password of my wifi ...
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3answers
2k views

What security measures should be taken when running a Linux web server out of our office?

I am interested in running our company's web server from our local office. The office makes use of file sharing and NAS devices among other common office protocols. The worst case scenarios I've ...
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4answers
2k views

What firewall settings on a Macintosh are the most restrictive, while still permitting casual internet use?

I don't want this to be subjective, so I'll try to make the requirements as clear as possible. On a Mac with Snow Leopard, how can I set up the firewall rulesets that allow ONLY: Using the internet ...
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7answers
7k views

What security implications are there for allowing outbound SSH traffic?

My school currently blocks outbound SSH traffic. Users inside the network cannot use Port 22, and attempting to make an SSH connection over another port is also blocked. (I'm assuming the firewall ...
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6answers
20k 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.