Network Security - securing network infrastructure and connections

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3
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1answer
118 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 group)...
4
votes
2answers
162 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
313 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
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2answers
214 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
114 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 protection/...
2
votes
2answers
221 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
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1answer
105 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
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1answer
739 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 it'...
95
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12answers
19k 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
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2answers
668 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 ...
3
votes
1answer
106 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
165 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
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1answer
224 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
247 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
votes
2answers
62 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
346 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
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1answer
98 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 auxiliary/server/...
1
vote
2answers
147 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, ...
4
votes
2answers
112 views

Set up a system to sandbox/capture outbound traffic from Windows PC?

Does anyone know of a program/system that is purpose built to allow you to sandbox/contain an outbound connection from a Windows PC? The aim being that you can analyse the data being sent via the ...
-2
votes
1answer
183 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 it'...
3
votes
1answer
979 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
votes
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 them....
1
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1answer
42 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 ...
7
votes
1answer
1k 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
277 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 ...
2
votes
1answer
97 views

When I connect my PC to a network, what (meta) information can the router/admin see that identifies my PC?

If I connect my Windows 7 PC to a third-party (wireless) network what information might the network admin be able to obtain about me? I know they can (sometimes) see traffic but that's not an issue ...
2
votes
1answer
107 views

How does an entity on a network (e.g. sysadmin, security software) identify that a user is connecting to the internet with a proxy?

For example, the security software iBoss is able to detect if you are using a proxy. Proxy Circumvention Proxy attempts to circumvent your Internet security solution not only violate your ...
4
votes
1answer
262 views

Can the windows Remote Procedure Call subsystem be modified from the default without causing Windows 8/8.1/10 to break?

This is a question that personally as a security professional has bugged me for a long time. So, a default Windows installation, from XP up to 10, typically has a few services listening on the quad-...
1
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3answers
232 views

Separate networks on one modem for security reasons

I'm not very familiar with networking issues, but my current project requires me to create an environment in which I will have 2 clients, but client 2 cannot see where client 1 is connected to and ...
1
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3answers
240 views

Does NAT really provide security? [duplicate]

I had an argument with someone on IRC about Network Address Translation. I was under the impression that NAT provided a layer of security to internal networks. I understand that's not the primary ...
-4
votes
1answer
168 views

Security Setting up personal web server [closed]

I'm sure something like this has been asked many many times over the Internet. I'm asking again because I need situation-specific response. I've already set up a home web server. My setup is like this:...
3
votes
2answers
107 views

Custom http server security concerns

I am using a framework called VERTX to create an HTTP server. This is different from a traditional web server such as APACHE or NGINX. Here I will simply be using JAVA code to create a HTTP server ...
4
votes
0answers
80 views

Are mobile phone calls cached by the network? [closed]

While transmitting a phone call from one mobile phone to another across several carriers, I assume it may be necessary to buffer the audio data for a few seconds. My questions: a) Is it true, ...
3
votes
2answers
380 views

how can an attacker access a system through a compromised router?

Let's say an attacker gained access to the admin panel of a home router with port 21, 23 and 80 open. I mean the attacker has full control over the router, thus being able to port forward, etc... ...
1
vote
1answer
161 views

Strange IP's on my firewall log

Check the screenshot of my router firewall log below, I can see traffic originating from strange IP addresses to my public address. What are these? I've just setup this router few hours ago, am I ...
10
votes
4answers
5k views

How to break MAC address filtering?

If a MAC filter prevents you from connecting to a network, how can you break it or include your device's MAC in that filter?
1
vote
2answers
149 views

Device visibility on a network

At my college dorm's Wi-Fi network, one device can play to any other network-connected, YouTube-enabled device on that network. Apple devices can also AirPlay to the one Apple TV connected here. How ...
1
vote
1answer
342 views

Network setup for malware analysis lab in a corporate view

I am planning to setup a malware analysis lab in the Incident Response team of the company I work for. As I am basically a malware analyst I some how managed to get up with the malware analysis lab ...
1
vote
2answers
572 views

TCP- or UDP-based Port Scans, IP Fragmented Packet

Is this normal or is someone trying to hack/attack me? How can I stop this? My router is a Cg3000v2 netgear provided to me by Optus. [TCP- or UDP-based Port Scan]411 Wed Aug 26 00:28:08 2015 27.253....
-3
votes
1answer
176 views

How to see all incoming and outgoing traffic of other nodes while on a LAN?

I've got two computers. A & B. While sitting on the computer A how can I see the incoming and outgoing traffic of computer B? Or can I? Note: Please try to answer in a non-technical language as ...
1
vote
1answer
170 views

Does the carrier network autheticates itself to the SIM card?

From my understanding this is how SIM authentication works: When the mobile device starts up it obtains IMSI from the SIM card and send it to the operator network Operator network finds the Ki(128 ...
0
votes
1answer
207 views

Network security from the inside

Yesterday I heard some people talking about not allowing users to RDP into servers they shouldn't and such which got me thinking about my companies network and the security of it. Can someone point ...
0
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0answers
33 views

Options to protect an outbound initiated connection IP?

Consider a service that has 3 separate organizations in a SaaS model. The end user(#1) connects to the first provider(#2) and then initiates a function from within the #2 that connects directly to #3....
0
votes
1answer
74 views

Is it possible to setup a rogueAP that indicates it is encrypted with WPA2 but in fact is open?

I want to create an exact duplicate of an existing access point that use WPA2 AES (CCMP) for encryption so that the clients will automatcally be connected to my AP.So I uesd this command airbase-ng -...
2
votes
1answer
359 views

Why Skype discloses my IP address to anybody? [closed]

Apparently there is a Skype exploit that allows people to obtain your IP address through your Skype username if you're online. The problem has existed since 2012. There exists countless websites which ...
4
votes
3answers
221 views

Open ports with no services bound to them

I have been wondering: if a port is open for inbound connections on the firewall yet there is no service bound to it, would that be considered a security vulnerability?
3
votes
1answer
882 views

ARP poisoning and port forward together

Suppose these assumptions: Router IP address: 192.168.1.1 Router MAC address: 00:00:00:00:00:00 My IP address: 192.168.1.2 My MAC address: 00:00:00:00:00:01 Victim IP address: 192.168.1.3 ...
1
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1answer
65 views

Is there a vulnerability when TLS is decrypted, then encrypted with OpenSSL that is vulnerable to BEAST or CRIME?

Assume that the following TLS proxy exists User <-----> Load Balancer that decrypts, encrypts <------> WebServer Where the web server is running a vulnerable version of OpenSSL. Can ...
0
votes
5answers
3k views

How to send HTTPrequest anonymously [closed]

I want to send a HTTPrequest to a specific web address, but with different IP address. For example, if a webserver detect IP address, then add it to a database. If another request come from a IP, ...
2
votes
2answers
158 views

Preventing active OS fingerprinting with iptables

I'm studying network security on my own and I have a few basic theoretical questions here. Would dropping every incoming packet at the network layer be enough to prevent active OS fingerprinting? I ...