Network Security - securing network infrastructure and connections

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2
votes
2answers
375 views

AES CBC over TCP - when is new IV needed

I am working on a project where two devices will be communicating with AES with CBC over TCP. We already have a secure mechanism for sharing the encryption/decryption key. I am not sure if we need to ...
4
votes
1answer
142 views

What is the effect if a Cisco router is transmitting PDUs to an ISP?

I was recently tipped off by our ISP that our router is transmitting PDUs to their switch, and told that if we don't turn it off they might be able to penetrate our LAN. What do they mean that we are ...
1
vote
1answer
75 views

For SSL certs, is some sort of connection to the issuing CA (or other network resource) required for the SSL connection to be established?

I was reading an article on creating a certificate authority, and came up with this question when I came to the section entitled "Distribute your certificates and CRL". Background: I am deploying ...
0
votes
2answers
245 views

Easy way to analyse my netstats for intrusions?

I want to analyse my network traffic against intrusions or hackers. I looked at Snort but it seems difficult to install on Windows and overly complex anyway. When I issue a netstat -a, I see various ...
6
votes
2answers
345 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 ...
2
votes
3answers
304 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, ...
1
vote
1answer
419 views

Examples for (Web-)Security-Architectures

I just started to work on my thesis to finish my studies. However the field in which I write my thesis is pretty much new to me. I have the task to build a "Remote-Access Strategy/Architecture" to ...
3
votes
1answer
550 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?
2
votes
1answer
1k views

How to view which mac addresses are connected to some AP?

I set up an open AP. I know I can view mac addresses of connected users via AP's console (local console). this is not what I need. I use tool like Netstumbler or inSSIDer on my Win 7 machine to see ...
3
votes
2answers
360 views

How can you (anybody) find out the IP address of a single computer inside college

How can you find out the IP address of a single computer inside a college network. Every computer has the same public IP address on the network. How is it possible, after discovering that the IP is ...
2
votes
2answers
3k views

How to set up a user-friendly NAS encryption?

We recently installed one NAS drive (Buffalo LinkStation Pro Duo, LS-WVL, running the most recent Firmware version 1.6 to be precise) in our (small) company network. Currently, there is no encryption ...
9
votes
1answer
1k views

Best way to report a foreigner attacker's ip to authorities?

I have been under attack last week and I was able to trace down the attacker and get his IP address. The attacker was located in Germany but I live out of Europe? From your experience what is the ...
0
votes
0answers
61 views

Can you port-scan a LAN, from outside the LAN? [duplicate]

Possible Duplicate: Scanning A Subnet Externaly Is it possible to scan ports on machines in a LAN, from outside that LAN? For example, I've got machines in my LAN network and want to check ...
13
votes
6answers
4k views

Why is ARP poisoning killing all network activity?

Using ettercap and ARP poisoning, I was able to eavesdrop on other connections, but suddenly I was unable to make any connection to the Internet. To restore Internet connectivity, I had to restart my ...
2
votes
5answers
148 views

Documentation Platforms for Information Security Team

I am looking for ideas on documentation platforms focused specifically for information security and response teams. Is there anything that has worked well? What are some of the unique advantages of ...
5
votes
1answer
448 views

What level of anonymity do VPNs provide?

When I use VPN is entire Internet usage protected or only some subset of traffic? For example, Is my IMAP email provider only going to see VPN's IP address? Is my DNS provider only going to see ...
3
votes
2answers
777 views

Tools/methods helping to determine application/protocol serving specific port

I do blackbox testing of the server and figured out that there is a bunch of listening ports. I need to determine what services/protocols those ports are used for. What I've tried so far is to use ...
4
votes
3answers
3k views

Doesn't an IP conflict occur when ARP spoofing?

I am playing around with Ettercap and ARP spoofing attacks. I have noticed that the computers that are involved in my attack not are displaying any messages telling that an IP conflict has occured. ...
1
vote
2answers
1k views

Can an insecure wifi connection block users who download a lot, from say: torrents or usenet? [closed]

Can an 'insecure community network' have automated features to block internet or slow speeds on computers which download a lot, from say: torrents or usenet? I have two computers and one has ...
-3
votes
1answer
133 views

Insecure community network connection problems [closed]

I live at an apartment complex which provided free wifi. My problem is I cannot get a good signal in my bedroom. In the living room my desktop (with a wifi Rosewill PCI-e adapter) gets an excellent ...
4
votes
4answers
444 views

Does TCP/IP expose critical infrastructure to added risk?

Background: I just attended a talk on the security of critical infrastructure. The speaker spoke a bit on how adding the TCP/IP protocol to functions usually taken care of by dedicated protocols open ...
6
votes
4answers
356 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 ...
2
votes
2answers
649 views

Low level attacks on WLAN/LAN connection while connected to VPN

Is it really secure to connect to a (well-secured) VPN server over an unencrypted WLAN connection (or maybe a hotel Ethernet)? I know, that there have been questions like this - but I'm not asking ...
3
votes
2answers
1k views

Restrict network access for a single process with SELinux or AppArmor

I have a Python script that access the network, and I want to deny it network access sometimes. How can I achieve this with SELinux or AppArmor? I want to be able to launch this specific script with ...
4
votes
1answer
169 views

How does my antivirus determine which CTL is used?

I have imported a trusted root certificate into the Windows local machine list. This works fine with my signed certificates, unless my AV (Bitdefender Antivirus Plus 2012) is set to "scan SSL", in ...
6
votes
8answers
946 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 ...
3
votes
2answers
176 views

Is this enough for an NIDS

I am doing my senior project on network intrusion detection system (ethernet networks) and I am having a bit of trouble deciding if I have added enough features. Currently the system detects the ...
6
votes
1answer
276 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 ...
4
votes
6answers
1k views

Tracking unique web site visits without logging IP addresses

On Monday, some IP address xxx.xxx.xxx.xxx visits my site. I log it. On Tuesday, another IP address yyy.yyy.yyy.yyy visits my site. I log it. If the two IP addresses are equal, I throw out the ...
3
votes
1answer
363 views

How to do layer 3 VLAN hopping?

I am connected to 3 layer switch used to create IP subnet-based VLANs. Is there any way to do VLAN hopping? Note that this isn't using 802.1q; it's not port-based L2.
1
vote
1answer
400 views

wireless: Jamming or interference? [closed]

I'm currently in a hotel trying to access the internet through the wireless offered by the hotel. WPA2-Personal network, password consisting of 16 numbers. Connecting to the wireless works fine, ...
1
vote
1answer
204 views

Can I bypass my own networked camera?

We have networked camera on my house. My brother is protected by user name and password. When I check my network in laptop, I can see the networked camera in my network but when I click to open, it ...
0
votes
3answers
447 views

Is it possible to “close” a port by dos'ing it?

If I see port 25 is open, but I dont have access to the program running the smtp server, could It be flooded with enough information to make it unusable (but not affect any other services)?
4
votes
2answers
383 views

How effective is changing the MAC address?

Since every vendor has a MAC address range, and Apple has network card models that only they use (Airport), I suppose that it is very easy to identify a network package as coming from an Apple device, ...
4
votes
2answers
2k views

Does Java applets reveal the real IP address, even when using proxy or vpn?

Can a Java applet reveal the original client IP address, when browsing through a proxy or a VPN? Why?
2
votes
0answers
80 views

Distinct databases with the same Kerberos Authentication server

Should two deployed applications within a private network requiring distinct databases (for storing their own users credentials) require distinct Authentication servers (implementing Kerberos)? Or is ...
5
votes
2answers
1k views

Snort Sensor Placement

I have a snort sensor monitoring some of my network being fed from a mirrored port. This mirrored session only monitors traffic between the firewall and peering switch. Since this just sees traffic ...
23
votes
7answers
2k views

Is having Steam installed a security risk?

Speaking to one of our security administrators at work, he insists that Steam is a well understood security risk and it shouldn't be installed on work machines. Saying it's not work related I ...
11
votes
6answers
3k 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 ...
0
votes
1answer
960 views

Monitor incoming TCP/UDP flood attack and graph it

I'm preparing a presentation on a security issue and want to include a demonstration. It won't be in real time, I just need to show some pictures of the results. I have some VPSes that will perform a ...
2
votes
2answers
3k 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. ...
2
votes
4answers
650 views

How password hashing is useful in MITM attack?

Even though I read a lot about hashing and how passwords are protected, I am still confused about it. If passwords are hashed at client side, it will be useless because it can be sniffed and used by ...
0
votes
2answers
319 views

How to securely set up wifi? [duplicate]

Possible Duplicate: How to secure a WiFi network? It seems like a simple question but I've thought about this for a while and have done quite a bit of Google searching. There's a LOT of ...
2
votes
2answers
918 views

PCI Compliance network scope

I was wondering if anyone could clarify the scope of PCI compliance with regard to multiple networks. At present, there's one PCI compliant network to which another network connects via VPN. The PCI ...
5
votes
1answer
489 views

How do you analyze an unknown network protocol?

Of course Wireshark can be used to sniff traffic - you can inspect each packet or chain of packets. But how would you do it smarter? Which tools do you use to identify behaviors or to automate the ...
4
votes
4answers
9k views

What are the laws regarding ISP recording IP addresses? How would they know who had which?

Since most internet users have ISPs using dynamic IP addresses (e.g. someone gets a new external IP address every few days) are there any laws requiring the ISPs to keep logs associating an IP address ...
2
votes
2answers
2k 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 ...
1
vote
3answers
1k 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 ...
1
vote
2answers
2k views

SUN Remote Procedure Call Port 111 [closed]

I have found on my machine port 111 is open. This is listed as RPC. I understand there are possible attacks on this port. How can my machine be attacked if port 111 is open? How can I secure this ...
5
votes
2answers
3k 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 ...