Network Security - securing network infrastructure and connections

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4answers
9k 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 ...
6
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4answers
834 views

What is War Dialing?

The topic says it all - I encountered the term in a PDF given to me. So ... what does the term/phrase 'War Dialing' mean?
6
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4answers
361 views

Worst case scenario of having the ability to remotely write files to disk as admin

I'm working on creating a program ("My Program") that will communicate with another program ("Their Program") via XML commands over a raw TCP/IP connection. Their program allows files to be written to ...
6
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2answers
2k views

Is Access Control Through MAC ADDRESS a practical/secure solution

I run a small local gaming website with a custom admin panel I coded to let trusted members do administrative tasks through the software's API. Since their IP Address is dynamic, can I authenticate ...
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5answers
1k views

Firewall demo - iptables

I have to make a demonstration about firewalls in my class as a student(university). It should be implemented using iptables on Linux. I am reading all the theories around them but I can't figure out ...
6
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4answers
507 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 ...
6
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4answers
653 views

Is Stonesoft's “advanced evasion technique” a major problem?

A month ago, Stonesoft (an IDS constructor from Finland) has launched an alert about Advanced Evasion Techniques. With these techniques, they claim to be capable of launching attacks on a network ...
6
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4answers
2k views

Is this type of ARP poisoning attack possible?

I am wondering if it is possible to paralyze a network by sending out a bunch of fake ARP response packets. Some basis: I recently read a moderately detailed description of how ARP and ARP poisoning ...
6
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4answers
882 views

How can a company reduce exposure to packet spoofing? What solution should exist, but doesn't?

I'd like to understand what anti-packet-spoofing technology exists (or should exist) to verify an inbound packet. Maybe this is as simple as a Cisco ACL, Firewall Rule, implemented at the network ...
6
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2answers
4k views

Scanning my network with NMAP

Each computer is assigned one ip address on my network, and my ISP supplies one IP for my network. If I try to scan the ip supplied by my ISP what I got is the OS running on the router, running on the ...
6
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3answers
2k views

TCP Sequence Prediction and it's prominence in modern systems/networks

I have a question regarding your experience of TCP Sequence Prediction that I am hoping someone could help with. I am aware of how TCP Sequence Prediction works and how the connection can be hijacked ...
6
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2answers
485 views

Suspicious 'upstream' traffic

We are seeing unusual amounts of traffic heading upstream on our WAN connection, during the day our system can exceed (or attempt to exceed) the 1Mbps limit imposed on the connection. I have PRTG ...
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8answers
1k views

Should I block visitors who seem to be probing my site?

I have detected some attempts to probe the security of my site. Should I blacklist their IP address? What are the considerations or tradeoffs to use in deciding when to block their IP address and ...
6
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3answers
3k 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?
6
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1answer
190 views

Parabolic Denial Of Service — Would it work?

Would this DoS attack be effective: Attacker determines target (10.0.0.1) Attacker sends ack packets to a buch of web servers with a src addr of 10.0.0.1 Servers reply to 10.0.0.1 with syn packets ...
6
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2answers
4k views

Is opening port 3389 on a router and forwarding this to a Windows SBS 2003 server secure?

I know of a company who has port 3389 open on their router and forwards this to a Windows SBS 2003 server. The server has the Windows firewall switched on, is patched and has an up to date antivirus ...
6
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2answers
7k 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 ...
6
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3answers
4k views

What makes the Blackberry device and network more secure?

One of Blackberry's strongest assets is the "network" that it uses. Can someone explain, or link to technical information that covers what this secure network is, and what it does better than the ...
6
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2answers
2k views

Initial steps of network mapping

In light of recent security breaches hitting the news, it's been all hands on deck at my work as far as security. I'm trying to pen test our network. I have a very basic question. My Question You ...
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1answer
160 views

Wireless auto-join on laptops

Maybe I have the wrong idea but this is a question that has been floating in my head for some time. Whenever you use an iPhone (or a Mac, Apple products seem to be more prone to this because it ...
6
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2answers
4k 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 by itself at times. When looked at it's logs, they had entries like: Friday Jul 13 13:09:02 2012 1 Blocked by DoS ...
6
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3answers
907 views

How do I identify an unknown port/protocol that my IDS picks up?

Googling a port and protocol leads to a terse description at best, and a linkfarm in the average case. Most protocols on assorted, unknown high ports contain little or no plaintext, and often if the ...
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2answers
626 views

What risks does WPA carry?

A family member of mine would like to be able to play old PSP games online. Unfortunately the device does not support WPA2, and my network is strictly WPA2 AES secured. What are the risks involved in ...
6
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1answer
289 views

What are the security measures taken on GPS transmissions?

I was just reading this article on how phone GPS work and the improvements that Apple had done to reduce the amount of time those calculations take on a regular iPhone. That makes me wonder: what ...
6
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1answer
4k views

High concentration of UDP traffic, good or bad?

Should a network have a high concentration of UDP traffic compared to TCP traffic bad for a network especially in the context of network security? I'm looking at my organization's network protocol ...
6
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2answers
6k 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 are the security risks of the Service Bus, and how do you mitigate them?

The Service Bus is software that can be installed on Windows or rented on Azure and allows someone to relay SOAP/WCF information over the internet in the form of a XML over HTTPS payload. One risk ...
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2answers
1k views

Using skype for an attack

I am curious about something; let's say someone randomly added me to Skype and tried to initiate a chat with me and I want to know more about them but I am worried if they can do some damage. My ...
6
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3answers
741 views

Does NAT break source port randomization?

The standard defense against the Kaminsky attack is to use source port randomization for all DNS requests. Does NAT break the security benefits of source port randomization? In more detail, consider ...
6
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2answers
11k views

Is NAT Loopback on my router a security problem?

Some DSL routers prevent NAT loopback. Security is sometimes cited as the reason. Is NAT loopback really a security issue? And if so, how is this exploited? NAT loopback... where a machine on the LAN ...
6
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2answers
247 views

What implications does IPv6 have for internet worms and script kiddies?

Though IPv6 is not here yet it one day we will all lose our familiar IPv4 addresses and be communicating over the internet solely with IPv6 addresses. What interests me is the implications this has ...
6
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2answers
333 views

Design proposals for enhanced security for parts of Internet, e.g. for banking?

There is some recent discussion of some sort of "multilevel" internet, with e.g. a level defined for banking in which access is only granted after special authentication with "true names", special ...
6
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3answers
504 views

How can an IPS be fingerprinted?

I'm not trying to solve a current technical problem but I came across this and have been wondering how it's done. Intrusion Prevention Systems are supposed to let all network traffic pass through and ...
6
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4answers
14k views

Pros/cons of using a private DNS vs. a public DNS

I was wondering why a company should use a private DNS. In comparison with a public DNS, which advantages does a private one have, and which issues can a public DNS create for a company? I'm new at ...
6
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3answers
5k views

Need a software that can monitor and log network traffic of installed applications [closed]

I need to monitor and log network activities of a specific software installed on my system. I know there are lots of network monitoring software out there, even system explorer has one built in. I ...
6
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1answer
5k views

Exchange of DEK and KEK (encryption keys) between app server and key server

In my application, it is required to encrypt a user's data before inserting it into the mysql database. I am using AES algorithm to encrypt the data using a 256 bit hash (and is calling it Data ...
6
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4answers
9k views

Secure use of psexec or better alternative to it

I want to remotely start VMWare virtual machines (I own VMWare Workstation) and to this end I need to execute on host something like "vmrun -T ws H:\VMWare\VM1\VM1.vmx nogui" with user desktop ...
6
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1answer
387 views

Epson Projector security threats

I have an EPSON PROJECTOR (model EB-824H) And I would like to use it in our company. As I know (but not sure) this kind of projector has no WIFI,no network card and there is no HD in this PROJECTOR It ...
6
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2answers
3k views

Strange STP traffic in my network, possible MitM attack?

I live at a student dorm, where we are connected to a student network. The administrators of this network have forgotten to disable STP broadcast on non-infrastructure ports. Periodically, I lose my ...
6
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3answers
720 views

wlan security - why is it not possible to protect against deauthentication flooding

Wireless security (Wikipedia) describes security issues due to the fact that wi-fi deauthentication packets are unencrypted: Weak PSK passphrases can be broken using off-line dictionary attacks by ...
6
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4answers
189 views

Does a separate internet connection increase security for remote users?

Our network admin has requested that a single remote employee purchase a separate modem in their house for "work" traffic. I question if this is a legitimate security practice of any kind especially ...
6
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3answers
291 views

Is it a bad idea to share the ssh host key in a diskless environment?

I am looking at this cluster of student work stations. They are diskless clients which boot from NFS. They also have sshd enabled. All of these machines share the same ssh host key (rsa,dsa,etc), ...
6
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2answers
736 views

SSH Tunnelling: How can I stop users being able to access services bound to localhost via port forwarding?

I want to be able to offer ssh accounts on my linux server for people to be able to use for SSH tunnelling. All accounts will be locked down with no interactive shell, for tunnelling / port forwarding ...
6
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3answers
3k views

Can I block the true IP address using X-Forwarded-For header in IIS?

All the traffic gets to my IIS server through a proxy. I can't block or white list IP addresses because all the traffic comes from the proxy's IP address. Can I use the X-Forwarded-For header with ...
6
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1answer
1k views

Deploying a campus WiFi network that authenticates against an AD LDAP

We are looking to deploy about 15-20 Cisco 1131ag access points on campus. I have been reading up on different authentication methods, but I don’t know what will be the best long term solution that ...
6
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1answer
802 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
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1answer
1k views

DSL Modem Compromised?

Just found out that the primary & secondary DNS servers have been changed to 95.211.156.101 & 5.45.75.11. I had the following setup in place. MAC filtering and WPA2 for WiFi. ...
6
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1answer
4k 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 ...
6
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1answer
3k views

How to create your own RBL DNS Blacklist to prevent spam

I am getting sick of reporting the same old chinese emails to Spamcop now and would like to make my own small RBL list that I can easily add blocks of IP's to. I have a spare PC and static IP address ...
6
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2answers
11k views

What is best practice for separation of trusted zones from a DMZ with a single firewall?

At our organization we have a single firewall sitting between our internal zones and the public internet. Currently all of our trusted zones are defined as different vlans on a layer 3 switch plugged ...