Network Security - securing network infrastructure and connections

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3
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1answer
37 views

Firewall - Allow WMI internal network

I am not totally sure if this is the correct stackexchange to place this question, so just let me know if it should be somewhere else. I am looking into IT asset management systems and for these ...
0
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2answers
62 views

Public key - private key question

I have a query about public/private key encryption that I hope someone can answer. So as I understand it: Client connects to server and server responds with certificate Client pulls the public key ...
3
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2answers
36 views

Are there enforcements on host configurations to protect other computers?

I was reading the Wikipedia article on Smurf attack. As far as I understand, the only protection from a smurf attack is to rely on other people to configure their hosts in a way that these hosts won't ...
0
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2answers
161 views

Spoofing TCP/IP stack OS Fingerprinting attacks in OSX

We need to change our OSX fingerprint in order to impersonate the Android OS against "passive OS fingerprinting" attacks. For Windows machines there are tools/guides for doing that, but can't find ...
2
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3answers
89 views

Linux File Security when connected to internet [closed]

Let me first admit that I am a nobody in computer security - I just know the various threats generally known to public. I have a Linux Cent OS 7 installed on my computer which is connected to the ...
0
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3answers
133 views

If I connect to a website using a cellular network, and change the sim card and connect again with the same phone, will they find its the same phone?

I read on a blog that when you connect to a website with your phone they track the model number id of the device, or something like it. I don't remember what its called. Even if you change your sim ...
2
votes
2answers
146 views

Spoof another IP address in the same network,will the spoofing source get the response?

I have read some articles about IP spoofing. Briefly speaking, IP-spoofing means the attacker uses a fake IP address in the IP header, to pretend this IP packet is sent by another machine. The ...
2
votes
1answer
73 views

Hiding packets, requests, traffic from my PC through Ethernet connected to workplace network

Before everyone jumps on the bandwagon, as I so often see, of saying you shouldn't do anything on a workplace network that is to be done annonymously on your own home network, I want to know an actual ...
4
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1answer
112 views

How often should I check for unknown open ports

I wan to run a cron job on each of my hosts that sends a list of all open ports to a central db on which I will run auditing and forensic queries. My question is how often should this job run so I ...
1
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3answers
158 views

Can man-in-the-middle attacks affect anyone not connected to the attackers network?

I'm trying to understand what these attacks are restricted to. I'm aware that man-in-the-middle attacks can be done if the attacker is on the same network (using something like Wire Shark), but is it ...
5
votes
1answer
196 views

Government/ISP tracking of internet activity trivial to evade?

The recently announced Investigatory Powers Bill in the United Kingdom will mean that ISPs must store the internet activity of everyone for one year. Anyone who wishes to evade such tracking can use ...
2
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1answer
78 views

Why hashing algorithms in layer 2 are weak? [closed]

It's known that hashing algorithms such as md5 and SHA1 are weak and can easily be cracked. I wonder why many layer 2 and 3 devices such as cisco switches still use weak hashing algorithms but don't ...
0
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3answers
189 views

Most secure way to isolate computer on network

I handle personal client information. Stuff that shouldn't get lost. Because of this, I have had to be careful not to download or install anything that is in any way uncertain. One data stealing virus ...
1
vote
1answer
51 views

What local ethernet-accessible resources can be accessed on a PC through a USB cable?

Clarification: this is about scanning the network resources on computer B from computer A in a situation where: Computer A is connected to Computer B through a USB cable Computer A has some scanning ...
2
votes
1answer
56 views

Types of risks for my router

Recently I've read about viruses and worms that attack routers and do some nasty things, incl. DNS changes etc. In the beginning, I just read that some people have issues that their DNS server address ...
1
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0answers
97 views

Is checking out network traffic for suspected malware useless if the malicious actor is in a different timezone? [closed]

I had recently upgraded from OS X 10.10 (Yosemite) to OS X 10.11 (El Capitan) from a bootable drive that the Genius Bar of one of the my city's Apple stores has, and I installed the 10.11.1 update ...
1
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0answers
22 views

Is there a “smart cache” device which provides cache if authorized?

Is there an implementation of a HTTP (or decoded HTTPS) optimization device which would allow for "smart caching" - i.e. the ability to release some cached content (initially transferred by someone ...
2
votes
4answers
297 views

What are the advantages/disadvantages of changing the SSH/SFTP port in Linux?

I have setup a remote CentOS VM (through a host) for our websites. I read an online recommendation to change the default SFTP port from 22 to a higher port such as 22000. I understand it is security ...
3
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0answers
46 views

Wayland Partial Encryption for Mouse / Keyboard? (Also X and RDP)

Question What are the best practices for implementing Partial Encryption, to encrypt just the input devices (mouse/keyboard, etc), not the actual video display, during remote desktop sessions using ...
-2
votes
1answer
134 views

What is the difference between X-Received and Received in email-header? [closed]

Also how to calculate delay between sent and received?
3
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3answers
85 views

Gathering network device data for security detection purposes

I've finally gotten the networking team to start sharing data on the devices they manage (routers, firewalls, VPN, NAC, etc), so we can get better insight into our network and focus more on detection. ...
8
votes
1answer
152 views

Can ICMP Redirects still be used to redirect traffic in a LAN?

I tried just tried to migrate a MITM attack using hping3 with ICMP Redirects in my testlab. hping3 -I eth0 -C 5 -K 1 -a 192.168.2.1 --icmp-ipdst 192.168.2.15 --icmp-gw 192.168.2.100 --icmp-ipsrc ...
1
vote
0answers
72 views

Peer Entity Authentication and Data Origin Authentication services in OSI layers

What kind of Peer Entity Authentication and Data Origin Authentication services are provided in network layer(L3), Transport layer(L4) and application layer(L7) ?
0
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0answers
44 views

VPN Server Inside VPN client on Router

This is a different context of an already asked question: In a few words: Sub-VPN or VPN SubNetwork... VPNsception? So I am using DD-WRT flashed router which connects as a client to VPN server ...
1
vote
2answers
94 views

Router or Switch can defend against ARP spoofing attack?

I'm learning about ARP spoofing attacks. Can a router or switch defend against ARP attacks?
12
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3answers
1k 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 ...
2
votes
1answer
78 views

Secure sharing between Windows computers

I'm working on a project to setup a secure system to share files between 5 Windows computers. The computers are part of a domain so could have multiple different users logging in (based on an AD ...
4
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0answers
75 views

How should software respond when Captive Portals or Untrusted SSL certs prevent connectivity?

I need to fix an issue where the initial (or perhaps only) HTTPS call to a website is blocked by a captive portal, not managed by me. The resolution has been to ask the user to navigate to a "http" ...
-2
votes
1answer
128 views

How to dnsspoof against HTTPS

I am doing a dnsspoof PoC, but apparently it doesn't work with HTTPS because of the certificate. Please don't tell me that I have to generate a certificate or send a legitimate certificate, I want ...
1
vote
2answers
131 views

Wireshark reveals suspicious UDP traffic sending to a bogon IP address

I am running windows 7, and using Wireshark I can see that my girlfriend's computer is sending UDP traffic to 239.192.152.143 on port 6771. I looked up info on that IP address, and it says it's part ...
1
vote
1answer
80 views

What was the purpose of this attack if one took place?

Background Windows 7 Home Edition HP desktop (no av/no firewall/ remote assistance enabled) two external drives attached/no documents on internal drive connected to fios wifi (wep ...
2
votes
2answers
167 views

How much information can be gathered about a network without connecting?

I'm working on a project that ideally needs to be able to identify local wifi networks, and be able to recall them if they are approached again. Is there any unique identifying information that can be ...
1
vote
1answer
83 views

Is it possible to disable `ypcat passwd`

We have an old NIS setup which, at geological speed, is being replaced by a Kerberos one. In the meantime, all the (non-root) users can simply type ypcat passwd and get the hashes of all the users' ...
1
vote
1answer
119 views

What are WiFi certificates used for? What are they?

Recently my university updated the certificates for authenticating on their WiFi network. I was hesitant to accept it because I wasn't sure what accepting it entailed or even what it was and what ...
95
votes
12answers
18k views

Is there a legitimate reason I should be required to use my company's computer? (BYOD prohibited)

I just got a new job at a medium-sized (~100 employees) company and one of the first things I was told is that I cannot use my own computer, because I need to be able to connect to their network, ...
1
vote
2answers
593 views

What would be the most efficient way of brute forcing a wifi key [duplicate]

I was wondering how can a brut force of my wifi be prevented so I want to know the best technique that can be used to brute force it first, so protection isn't my question. My question is: What brute ...
2
votes
1answer
94 views

Is it possible to maintain security and data integrity through a network decrypting HTTPS?

A network I often use has started to decrypt HTTPS traffic (and reencrypt, using a different key) using a local proxy. This proxy is operated by people I mostly trust. However, I would like to know if ...
4
votes
1answer
103 views

Mac overflow (flooding)

On a recent switch, is mac flooding still a vulnerability to be careful of? If that attack is patched on most of them, then on which type of switch is it still vulnerable?
1
vote
1answer
195 views

If I have my neighbors wireless router password, can I access his data with a smartphone?

My neighbor gave me his wireless router password to use on my smartphone. Using this, can I access any of his accounts whether it's his bank account or Att/Direct TV account? I ask because I think ...
1
vote
1answer
97 views

best practices for storing retrievable passwords

I am trying to build a NMS (network management system) and I am required to store passwords for 3rd party databases, devices and servers that are being managed (not user passwords). These passwords ...
-1
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2answers
53 views

Prevent fake gateway device attached to PC's network card

Office. Several PCs with Linux. Internet is limited on gateway level, so nobody could do POST-requests over HTTP. We prepared several measures to prevent data leakage on infrastructure level, but ...
3
votes
3answers
192 views

What does a switch do against a packet sniffing attack?

I have heard that using switches in my network helps prevent against a packet sniffing attack but how does it help prevent the attack?
1
vote
1answer
53 views

DHCP Exhaustiation / Rogue DHCP interrupted by real DHCP NACK

I was trying to run a Rogue DHCP Server which should cause a MITM attack. I did the following Exhaust the real DHCP Server using DHCPig (worked) Run a Rogue DHCP Server using the ...
1
vote
2answers
113 views

Arp network (prevent mitm attack)

On my school network, using wireshark to see network traffic (filter=arp), I only see gratuitous packets. Meaning, all hosts on network send gratuitous packets (ex: gratuitous for 10.10.3.54, ...
-2
votes
1answer
118 views

Is rolling your own network protocol insecure? [closed]

By now, everyone on here should know that rolling your own crypto is bad. But what's about rolling your own (encryption supporting) network protocol? I'm working on an open-source project (by now ...
3
votes
1answer
385 views

How can Port Stealing be used as a MiTM attack?

I read about and tried a lot of MiTM attacks but I just don't get how Port Stealing can be used as a MiTM attack. In my understanding one can "steal" a Port by sending Ethernet Frames faking the ...
8
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6answers
2k views

Dual Router Configuration

I have a home network that was hacked into recently. The people that got into my network actually accessed my personal files and although I cannot prove it, I think they might have stolen some of ...
1
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1answer
35 views

How to isolate web console of network switch from LAN where they working

Network switches on my work have web console. Despite it is password protected I want to hide it from LAN. Currently switches has static IP with mask that differ from DHCP server, so they not visible ...
6
votes
1answer
567 views

Message signing disabled (dangerous, but default)

Over the last couple of years, I've developed a fairly keen interest in Penetration Testing & Information Security. Throughout this time, I've acquired (and accumulated) a range of different ...
3
votes
1answer
152 views

Setting up a honeypot to detect malicious network activity

So in the world of networks, people try to gain access to the client machine and perform lateral movement. Honeypots are often used to give them an easy access point and show them an unfavorable or ...