Network Security - securing network infrastructure and connections

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MACSEC nonce/key uniqueness

802.1ae requires a nonce to be sent with each Ethernet frame in the MACSEC tag. The 96 bit nonce is formed by concatenating a 64 bit fixed field (based on MAC source address and port number) with a ...
3
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5answers
217 views

How to introduce delay in scanning tools that do not implement delay without touching source code?

Usually scanning tools implement a switch in order to delay requests and not flood the target. Sometimes there tools that do not implement this delay option. Is there a way to delay packets from ...
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3answers
5k views

How do you detect load balancing?

Scenario You need to PenTest XYZ.com. You expect, because it is a high traffic site, that multiple servers are being used with a load balancer. Question Aside from pulling the MACs (which are ...
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1answer
230 views

Packet-filtering firewall evasion (Scanning)

Context I'm very familiar with different applications of scanning tools (. . . and you can use -mtu to specify the size of the fragments in nmap . . .) but every piece of information I read about ...
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2answers
3k views

What is more risky? Database Server in DMZ or Trusted Network?

Hoping this is not a dupe of any of the related database / DMZ questions, but I don't think any of them answered my question sufficiently. Assume the following A web server is being used for ...
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2answers
3k views

Protecting against SSL Strip [duplicate]

I've read you can attack connections using tools like sslstrip, if you are on the same network. So what ensures that our SSL connections remain safe? Does it depend on the cert strength? Do you ...
2
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2answers
592 views

keylogger detection by listening network

It is known that malware often uses keyloggers. Also some viruses aren't detected by antiviruses, therefore some viruses, especially APTs could stay in a system for so long without any detection. What ...
1
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1answer
281 views

What are the basic implementations that make a network secure from the inside\outside?

Would you consider the following to be "basic hardening items" for network equipment and servers? VLANs Access Control (such as NTFS permissions) Patch Management System Host Firewall Anti-Virus ...
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3answers
16k views

Should SSL be terminated at a load balancer?

When hosting a cluster of web application servers it’s common to have a reverse proxy (HAProxy, Nginx, F5, etc.) in between the cluster and the public internet to load balance traffic among app ...
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6answers
90k views

If someone hacks my wi-fi connnection, what can they see and how?

I have two questions on wifi security: If someone knows my wifi password (be it WEP or WPA) what can they see on my screen? Do they just see URLs I visit, or can they see everything in my ...
3
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3answers
13k views

How to tell if you're being ARP poisoned?

I am having some issues at work and there is a new network admin in place. I think I am being monitored so decided to run ArpSpy X in two scenarios: Over WiFi bridge pluged into cisco router to took ...
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2answers
186 views

Are temporary blocks sufficient response to network probes?

We have the option of using an automatic blocking feature of our firewall to temporarily block the source IPs of network probes. It is fast and automatic, and it expires after a set amount of time. ...
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1answer
138k views

Why can you bypass restricted WiFis by adding “?.jpg” to the URL?

I recently read an article on Hacking a commercial airport WLAN. It's basically about circumventing paid airport WiFi redirections (they redirect you to a certain URL when you type something in the ...
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2answers
687 views

What type of data does Snort log?

This is new to me, but what types of data does Snort log for Network Intrusion Detection? I am guessing time stamp, source IP address, destination IP address, source port, destination port, protocol. ...
9
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2answers
8k 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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2answers
146 views

Wifi box produces three SSIDs?

While using a friend's wifi, he said I should use his SSID, let's call it XYZ's Wifi. When I started my Macbook Pro, three SSIDs came up. Two were called XYZ's Wifi and the third was called XYZ's ...
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5answers
3k views

How can I configure my router to prevent connections bypassing it?

I am trying to configure my router to control access for several of my devices at home. I am currently using a linksys router. Our home consists of three devices (a desktop, a laptop, and a ...
1
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1answer
360 views

Is suspicious network activity likely to be caused by a rootkit?

Netstat has been one of my favorite tools to check out possible malicious connections, but then I heard about the dangers of rootkits and their high complexity, allowing them to be able to bypass ...
19
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1answer
5k views

What are darknets, and how can they be used to provide security and anonymity in network communication?

One of the major problems with the internet is that it's difficult to stay anonymous while retaining the ability to communicate with a large number of people. While encryption can be done effectively ...
3
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5answers
1k views

Building my own Darkspace

I have searched through the internet about creating a darknet and there is a confusion. There are two definitions, the first one is network used for private p2p (like freenet) and another one that ...
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2answers
305 views

Analyzing Network Anomalies for Malicious events

For a network security project we are listing to our network traffic of about 50-60 hosts. We aim at identifying malicious event within our network traffic by identifying network anomalies. Our main ...
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2answers
1k views

DrayTek Vigor 2920 HTTPS allowed

In my office we have a DrayTek Vigor 2920 router, with CSM setup to only allow certain keywords (keyword objects) to certain IP groups. This all works fine, however we've discovered that all HTTPS ...
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4answers
6k views

Security measures against packet sniffing

I work in a environment where packet sniffing can be easily done . I was worried about my confidential data . Please suggest how is it done and precaution which i can take at client level.
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1answer
128 views

Symbiote Counter-Attack Detection

I saw this video on YouTube about hacking Cisco phones (and other embedded systems) and I was overjoyed when the presenter not only hacked, but presented a security solution. Intrigued, I started ...
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5answers
6k views

How to Investigate Wi-Fi Intrusion and where to look for evidence?

I'm trying to figure out how to configure a network so that I can tell what an intruder did (in the past) while on the network after they are detected. eg. If someone with a wi-fi enabled laptop ...
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1answer
2k views

How to track down an IP spoofer?

We just installed a SonicWALL NSA 3500 and I've noticed a few times per day there will be an alert entry like this: Time: 01/02/2013 9:00:41.000 Priority: Alert Category: Intrusion Prevention ...
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2answers
525 views

How was pentest performed in the era with no frameworks like Metasploit?

I have been interested in security lately, I have been reading mainly cookbooks on Metasploit framework, how social engineering has been employed exhaustively, I have started reading some IA-32 ...
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6answers
479 views

Secure internet access while traveling

Given the risks of shared wi-fi as stated here, here and here, I would like to ask what are good practices for someone who is always traveling. While having your own wi-fi with a strong WPA2 password ...
2
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2answers
6k views

Block all internet access from a computer except for allowed applications and domains?

I want to block all internet access from a computer except for allowed applications and domains. E.g. BLOCK ALL Except security.stackexchange.com/... Except skype.exe How can I do this? -It needs to ...
2
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3answers
1k 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 ...
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2answers
679 views

Networking books for programmers [closed]

I have some programming experience, mostly in web apps, based on pre-existing frameworks. That is, all the networking side of things are handled already, and no knowledge of them is necessary. I ...
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2answers
464 views

Network security: Public and Private keys

In Pretty Good Privacy, it is said that Sender sends compressed message and encrypts the message with the private key of himself. And then Receiver will decrypt that message with the public key of the ...
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1answer
344 views

Security of Openflow/SDN network

Openflow/SDN networks give a remote controller the ability to manage the behavior of network devices i.e. configurations. They can forward instruction sets to dynamically change network configuration. ...
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1answer
69 views

Connecting to IP [closed]

It is possible to connect to multiple IPs at a time like when we are connected to LAN at the same time we can be connected to a Wireless connection. In this case does our network speed gets added or ...
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2answers
342 views

DNS cache poisoning

What are the things the attacker needs to know from the victim to perform DNS cache poisoning ? for example : IP , Port number and Transaction number what else ?
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1answer
946 views

Designing DMZ(s) [closed]

I was wondering what would be the correct way to isolate servers in order to protect them and us from too much harm. Let's have two scenarios: 1) Access to Application Server from the world We have ...
3
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1answer
335 views

Are man-in-the-middle attacks against p2p systems realistic?

I'm implementing a DHT based on Kademlia following this paper. The protocol described in this paper uses nonces to protect against man-in-the-middle attacks. The disadvantage is that latency gets ...
14
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3answers
858 views

Do any DNS registrars support multi factor authentication?

I am looking for a DNS registrar that supports strong multi-factor authentication. Does any DNS registrar support multi-factor? Is this a legitimate need?
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3answers
420 views

Some issues with iptables and nmap

When I scan my pc with nmap I see only one open port. I didn't define any rule in iptables so if I'm not mistaken, all connections should be denied by default. However I can use HTTP or SSH, so that ...
2
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2answers
17k 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 ...
5
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2answers
1k views

Unidentified public network sending traffic through my computer

I'm having a problem with one of my computers. I suspect it's being used for something malicious. A few weeks ago my internet connection went down, I called my ISP and they told me that no MAC ...
2
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1answer
671 views

What are the best Nmap Scripting Engine (NSE) service discovery scripts? [closed]

Using nmap -sV can be quite verbose can -sU can take a very long time especially with -p 0-65535. To narrow your results and enumerate interesting services the wealth of NSE scripts can be very ...
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1answer
278 views

How to Transfer packets from one ethernet card to another [closed]

I have a desktop with two ethernet(etho,eth1) cards and OSSIM installed in it. I have a laptop with webmin installed, where i want to write rules for transferring packets from eth1 to eth0. Both the ...
0
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1answer
184 views

Windows Firewall accepts a three-second unicast response from any source

I have read this article but still has some doubts may be after that... The Windows Firewall feature in Microsoft Windows XP Service Pack 2 (SP 2) accepts a three-second unicast response from ...
9
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3answers
8k views

How can I detect if someone is sniffing network packets on the LAN?

I would like to know if there is a product or software that can detect if there is a sniffer currently on the network? In other words is it possible at all to detect if there is a network card on ...
0
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2answers
166 views

Setting up a remote test environment correctly

My setup: - Main Box (connected to network) - VM1 : Linux - VM2 : Windows 7 Both the VMs are running off VM Player and using Bridged: connected directly to the physical network and replicating ...
9
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3answers
590 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? ...
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3answers
193 views

wireless security concern [closed]

My small office has Netgear Router (N300 DGN2200). I had it secured using "password" . So any computer which needed access had to give the security password. But today a outsider accessed my router ...
2
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4answers
528 views

Detecting and filtering data over AC power lines?

Given that it's possible for the average consumer to send covert signals over normal AC lines how can an IT department identify and filter out this communication? I'm not sure how difficult this is ...
2
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1answer
83 views

Seeing outboud connections to random domains, how do I isolate the app responsible?

Last night I loaded up Fiddler2 to do a little debugging and I saw three connections to domains like hghefhhig How can I go about isolating the application responsible? I was thinking possibly ...