Network Security - securing network infrastructure and connections

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3
votes
2answers
260 views

any reason not to run tmux/wemux on a bastion host?

Is there any reason to worry about running tmux/wemux on a bastion host? It seems to me that it would open up vectors to have your terminal sessions hijacked by some locally exploited account on the ...
1
vote
1answer
73 views

Securing Downloadable Files on Website Per User

I have an ASP.NET website serving up private PDF documents. The PDFs are stored unencrypted on a share on the internal network. The user logs in and navigates to the download page. The web server ...
2
votes
2answers
1k views

What's the difference between an application-level and circuit-level gateway?

From Wikipedia, I understand that circuit level gateways look at TCP handshakes to filter illegitimate traffic and that application level gateways somehow filter application specific traffic. But I ...
2
votes
1answer
94 views

Eavesdropping a communication between a local application and the network

After some digging on the Internet, I've been unable to find a satisfying solution for my curiosity... Here's the thing : using a shell script, I've been able to obtain a list of IP addresses ...
1
vote
1answer
102 views

IPSec, hubs, crypto maps

I thought hubs were layer 1 devices, and so would have no active role in IPSec. I am reading to understand crypto maps, Dynamic crypto map policies are used in site-to-site VPNs when an unknown ...
3
votes
3answers
2k views

Securing a network attached storage on the internet

I recently purchased a network attached storage for personal file storage and would like my family members to store files on the device from their computers as a remote backup. I'd like to secure ...
10
votes
6answers
1k views

Alternative to VPN

We have a network that is completely closed to the outside world. It needs to be. Problem is we need to remote into a server on this network once in a blue moon for diagnostics. We've discussed ways ...
2
votes
1answer
2k views

Snort/IDS detect and alert on possible DoS/DDoS attack?

As per the title, I'm attempting to configure Snort to detect and alert on a incoming Denial of Service attack. Looking at the rulesets, which are primarily signature based rules, I can't see a ...
4
votes
4answers
666 views

How to make sandbox-only internet access?

How can I set up my Windows PC and/or network, so that none of the programs on my actual PC have internet access, but i have a sandbox/VM, with a browser, which has internet access, but has no access ...
1
vote
2answers
984 views

Open DNS Dynamic and Static IP

I want to block adult sites not torrents and other. Currently i am using "OpenDNS Home free". i set those free DNS 208.67.222.222 and 208.67.220.220 in router DNS fields and also i have "OpenDNS ...
3
votes
5answers
313 views

Blocking network access to host(s) at the kernel level in Linux?

Getting it out of the way: Not iptables! What I'd like to do is block network access to certain IPs, subnets, and/or hostnames at the Linux kernel level, such that no user, including root, could ...
1
vote
2answers
287 views

Is IP Forwarding a risk by itself?

A coworker claims that merely enabling IP_forwarding on a single homed Linux machine poses a security risk as he says it could then be used as a proxy. I can't think of how this would work, except ...
2
votes
4answers
1k views

How to remote monitor a computer network traffic?

I would like to know if it is possible to remote monitor the incoming and outcoming network traffic of a specific IP from my network. I need to log the time, ip numbers and port that contact the ...
2
votes
0answers
74 views

Is the GTK or MIC in the unencrypted portion of a WPA protected frame?

In order to decrypt traffic you must have all 4 portions of the WPA Handshake. In WPA protected data frames, is there an unencrypted portion of that frame that has some sort of identifiable value to ...
3
votes
5answers
1k views

How can I find the source of traffic allegedly originating from my IP address?

I have a problem that has been going on for at least 6 weeks. I have Time Warner for my Internet provider and some websites hosted at GoDaddy. From what GoDaddy tells me the reason I can not view ...
0
votes
1answer
64 views

How to specify a Snort rule connection duration?

Is it even possible to specify into a snort rule the duration of a connection? For example: in this format Hour, Minute, Second H, M, S = 0, 2, 1 If a connection that has the duration of 2 minutes ...
2
votes
1answer
442 views

How to add wildcards to snort rule ip address?

Is it possible to add wildcards or something that would function like them to a snort rule IP address? For example: If I'd like to detect source-ip of: 192.168.*.9 Where the third octet can be ...
2
votes
1answer
566 views

IPSec AH + ESP used together

When ESP and AH are used together (ESP transport, AH transport) on the same packet does ESP encrypt the AH's hash, or is the hash left in the clear? If the hash isn't encrypted, there are obviously ...
-1
votes
2answers
289 views

How to Block a url not a website

I want to block a single url. I am using OpenDNS now and it is working fine with website blocking on my network but the problem is that i want to block a url like ...
5
votes
3answers
306 views

Organization like OWASP for network security?

Is there something like OWASP for Network Security ? Or have anyone of you come across a testing guide for network security, as to how to start an audit and then the minimum number of tests to run ...
7
votes
1answer
186 views

Using / finding covert channels in inter-process communication

I've got a class exercise that involves a virtual game of Werewolves/Mafia. We're not really taught how to do anything in this class, which makes it hard for everyone to do the labs. The idea is that ...
0
votes
2answers
187 views

What service could penetrate my Firewall via UDP on Port 17275?

Has anyone monitored various requests from all over the world on Port 17275 via UDP? My firewall logs show huge amounts of such requests from lots of different IP Adresses. I can't find any ...
6
votes
4answers
10k 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 ...
1
vote
1answer
255 views

Using a Web Server to steal NTLM credentials

I am trying to design an attack vector against an organization in which the pen tester (myself), steals NTLM credentials through HTTP. I am thinking of these scenarios: 1- I set up a web server on my ...
1
vote
0answers
411 views

Automatic router admin password change [closed]

I feel that this is definitely a hack of some sort and an interesting one. I am using a Beetel 450TC1 ADSL2+ modem router and here is what I face: * First, I disconnect the telephone line from the ...
6
votes
3answers
773 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 ...
1
vote
3answers
1k views

How to encrypt packets in network?

I have a simple wireless router to share the internet with single access username/password. I was wondering if it is possible somehow to set packet encryption so that other people on the LAN cannot ...
3
votes
4answers
474 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?
-4
votes
1answer
1k views

DoSing my Home Network with only a Public IP address [closed]

+--------------------------------------------------------+ | Client Host Name |.. IP Address ..|.... MAC Address ...| | Desktop-Home ....| 192.168.1.100 | 00:19:D1:EA:03:68 | | GT-S5380K ...
-2
votes
1answer
111 views

Why should I use the VPN? [closed]

Does a Virtual Private Network (VPN) provide an encrypted connection from outside networks or from ISPs to the internal network?
4
votes
1answer
658 views

Is it possible that my home router is preventing my ARP poisoning attack?

As part of a school project I am trying to do a MITM attack on my local network using ARP poisoning. I choose a target and then I send a spoofed ARP packet to it and to the router every 100 ...
0
votes
3answers
606 views

How to hide local network traffic on my computer?

I want to hide any traffic an application makes on the local network, make it look like the network is completely quiet to the system and other monitoring software. Is this doable? How would I ...
80
votes
7answers
6k views

How can I protect my internet-connected devices from discovery by Shodan?

There's been a lot of buzz around this recent CNN article about Shodan, a search engine that can find and allow access to unsecured internet-connected devices. Shodan runs 24/7 and collects ...
19
votes
7answers
7k views

DDoS - Impossible to stop?

Is it possible - in theory - to stop1 a DDoS attack of any size? Many people claim it's impossible to stop DDoS attacks and tell me I just shouldn't mess with the wrong people on the internet. But ...
2
votes
2answers
1k views

Prevent unauthorized workstations from joining a Windows Domain

Corporate policy only allows users to connect corporate-issued machines to the network managed by Active Directory. Is there some means to log or otherwise detect when the same user account joins the ...
5
votes
3answers
2k 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 ...
2
votes
1answer
119 views

find hardware and OS specs on routers

How do you determine the model and IOS version of a Cisco router, if you have its IP address remotely, but have no physical access. For example, I run nmap -sP and can see the router's IP, but all ...
4
votes
1answer
442 views

What are the vulnerabilities of VOIP-specific security protocols?

Existing relevant questions: How do you Secure VOIP in a large organization What are the main issues and best practice security controls when exposing SIP and H.323 to the Internet? Do secure phone ...
2
votes
2answers
1k views

How do I diagnose client-side SSL errors?

Often on my home network I get random SSL certificate errors when I visit certain well-known sites. Today it was a Google SSL error, where Google apparently tried to identify itself as *.icloud.com. ...
3
votes
1answer
102 views

Suggestions for secure fax SaaS

Does anyone have experience with any fax cloud services, which they can recommend from a security standpoint?
2
votes
2answers
559 views

Does “loose source and record route” drop the source address?

Is the source IPv4 address lost when a person uses "loose source and record route" and the destination address is put before the end of the list of addresses through which routing should occur? It ...
14
votes
2answers
524 views

Why on earth would anyone use the 'top secret' option of IPv4?

So, I was reading RFC 791, and got to the bit about options (here). Everything seemed to be decent and sensible, until I got to the 'levels of security' part. Now, I can understand how, internally, ...
7
votes
3answers
2k views

Security measures for a WiFi access point?

I am planning to purchase a program that comes with an App that allows you to control the program via phone. The developer told me that the connection will be done via an extra WIFI box connecting to ...
4
votes
5answers
704 views

How to bypass Nmap blockage?

I rent a server, and my provider seems to be blocking nmap. Is there any other tools I could use to test my home network from the outside? Also, does blocking nmap on a network provide any security? ...
6
votes
4answers
549 views

Has my network/computer been breached?

I'm not sure if this is the right site to ask, so I apologise if it isn't, but here goes. A while ago I started noticing some odd behaviour. My Gmail account was compromised, it seemed, and I had to ...
2
votes
2answers
2k views

do different subnet masks on home network provide any security?

So I have two routers on my home network: one is provided by my ISP, and the other is my private router. Router A- ISP router: 192.168.1.x router B- private router: 192.168.2.x Clients on my ...
1
vote
2answers
235 views

Intrusion Prevention Systems: NIPS vs NBA

I was going through the wikipedia article on Intrusion Prevention Systems. It states two of the four types of IPS as follows: Network-based intrusion prevention system (NIPS): monitors the entire ...
4
votes
3answers
1k views

How will IPv6 affect DDoS mitigation techniques?

IPv6 introduces a much larger address space than IPv4 and with it there are many new techniques in creating and mitigating DDoS attacks. What are some examples of risks and mitigations? For example, ...
4
votes
1answer
2k 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 ...
3
votes
2answers
388 views

Why does layer 2 IDS seem underdeveloped compared to layer 3 IDS, for wireless network?

I understand that there are many applications such as Snort that do the job for network layer 3 IDS. From what I have researched, layer 2 wireless IDS seems like a field that is very slow in ...