Questions tagged [network]

Security of network infrastructure and network traffic. For questions about security of network equipment, topology, protocols, traffic, administration, and configuration. Related tags: [packet], [firewall], [network-scanners], [network-access-control].

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votes
1answer
838 views

Security implications for two applications communicating with TCP/IP on localhost

Considering this for the local loopback connection: - It is implemented entirely within the operating system's networking software and passes no packets to any network interface controller. If two ...
4
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4answers
470 views

How can a network be secured against attacks coming from the inside?

(updated to (hopefully) be less broad) No matter how well one secures a network there's always the chance of an attacker gaining access. In a shared home + home office network (eg. for a remote ...
3
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2answers
182 views

Are there established and/or curated security benchmarks/best practices for home appliances and networks?

I have seen several security standards and best practices for organizations (CIS, HIPPAA, PCI DSS) but are there any for homes? If yes, where can I find them? It would be nice for homeowners to have ...
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4answers
2k 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 ...
3
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5answers
2k 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 ...
3
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2answers
10k views

How do I know that my connection is really encrypted?

I am using a VPN to ensure to encrypt my traffic. I wonder though if I could check somehow if the datastream really is encrypted?
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2answers
5k views

unknown user on my router

Recently i noticed that there is an unknown user connected to my modem. I tried to block the mac address by accessing router page(192.168.1.1 ,dlink modem) > parent control > macaddress filter > put ...
2
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2answers
613 views

Isolating guest networks

I'm setting up a secondary guest wifi on my router and I want to make sure that it's impossible for clients connected to the guest wifi to access my primary network. Initially, I used IP filtering ...
14
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2answers
865 views

How does the Copyright Alert System work? Who has implemented it?

Some ISPs are participating in a Copyright Alert System that notifies content authors of violations of their copyright. I'm concerned how this oversight relates to my private traffic, and what laws ...
13
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3answers
1k 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? ...
13
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4answers
10k views

Looking for botnet IP address feeds to protect against DDoS

I would like to get a live feed of botnet IP addresses delivered from a service and block them under certain conditions. Preferably community based/open source but open to looking at worthy commercial ...
12
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4answers
8k views

Is NTP vulnerable to DNS poisoning or spoofing attacks?

Scenario: Attacker somehow compromises the DNS lookup for the NTP server used by the victim (a web application) Victim sends DNS request for e.g. ntp.pool.org, which is responded to by attacker to ...
10
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3answers
4k views

Secure PXE network OS installation

How can one make sure that when PXE is being used to boot a remote operating system, that the data being sent is encrypted (or at the very least that integrity is maintained)? Would it be possible to ...
9
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3answers
742 views

Popularity of Anomaly based IDSes

I've been reading quite some time about anomaly/behavior based IDSes for Web servers. I understand the downsides: possible high false positives, learning phase, constant training. My question is how ...
9
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3answers
9k views

Block all BotNets and TOR addresses from accessing our site

I've heard that many DOS attacks and general "black hat hacking" attempts occur over the TOR network. Is it possible for me to dynamically block source IP's by their presence in a BotNet or similar ...
7
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4answers
5k views

Is it possible to sniff traffic of a remote network? (With admin access to router)

Me and a friend of mine are simulating a widespread scenario where router configurations are untouched (default passwords) and are visible from the internet. Him, acting as the victim, will constantly ...
7
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2answers
2k views

How easy it is to actually perform MITM attack these days

The website I am using is using HTTP for retrieval of the page. In the page they ask you to enter credit card details that then go via HTTPS (to another server). They claim that this is secure enough (...
6
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3answers
8k views

Is it risky to allow SMB traffic to the Internet

SMB is a well-known network file sharing protocol, and I assume it's supposed to be used internally only. At my company I found someone connecting to a share on a server on the Internet over port 445 ...
5
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2answers
798 views

How to deal with UDP bandwidth exhaustion DDoS attacks?

I am building a service, which will use UDP. It will run on Amazon AWS - in the firewall they provide, I can block everything except that one UDP port my service will run. The only thing I'm ...
5
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0answers
186 views

How to send Wi-Fi management frames from macOS?

I realise that this question has been touched on before as linked here. However, none of the solutions suggested solved my question and it fails to answer the overarching question of how to send all ...
5
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3answers
7k views

Jump Servers for security

In my network, I have the clients directly connected to the server; but in the new PCI policies, they required to use jump servers. What is the advantage of using jump servers for security reasons? ...
5
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1answer
2k views

Firewall rules to block unwanted protocols on given ports

Does somebody has an idea, that what kind of iptables/pf rule must i use to achieve this?: i only want to allow these connections [on the output chain]: on port 53 output only allow udp - dns on ...
4
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1answer
7k 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 ...
4
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0answers
62 views

How does BGP filtering work to prevent routing hijacking? [duplicate]

I've been reading for a while but yet do not properly understand how is BGP filtering used to prevent "attacks" such the recent Indosat's problem. Do not copy&paste Cisco's site, I have read all ...
4
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1answer
2k views

Forensics - trace back DNS query origin on host?

So I tried to search the web for answers but didn't find any. Is there any way to trace back which exe file or application caused the computer to make a specific DNS query?
4
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3answers
2k views

How does a Man In the Middle attack happen in reality

I am trying to improve the MITM protection of an iOS app I am responsible for, so I want to understand exactly how it happens. I have set up Charles to act as a proxy which required setting the proxy ...
4
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5answers
5k 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 ...
3
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0answers
99 views

Why exactly are self hosted websites deemed that dangerous? [closed]

Up to now I'm using a raspberry pi as a local server for trying out things or hosting my own little projects (beginner level), but I want to make it publicly available (most likely only for people I ...
3
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1answer
1k views

Why do WiFi devices broadcast? [duplicate]

I may be missing something about how WiFi and networking in general works, but I do know how WiFi device tracking works. When eg. an Android phone has WiFi on, it's sending a ping/broadcast message ...
3
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2answers
2k 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 ...
3
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2answers
1k views

How to get rid of an Ad bot?

The issue started due to setting up a proxy server on a PC connected to my network. I then realized that all of my devices that connected to the network, including PCs and phones, are all infected by ...
3
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2answers
178 views

When would you support the storage of Security & Application event logs in the Cloud?

Under what conditions would you be comfortable storing server log data residing in a secure facility, off-premises? When would you consider a SaaS /hosted solution and what value add should that ...
3
votes
1answer
923 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 ...
3
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2answers
618 views

Share network with neighbor

My neighbor asked me if I wanted to share his network with me. Internet access is a little more expensive here than I am used to in my country. Before saying yes I wanted to know if I had risks in ...
3
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2answers
4k views

Closely spaced failed logins in auth.log

I have a raspberry-pi (running GNU/Linux) and I recently allowed my router to forward port 22 (ssh) to the raspberry-pi so that I could log in while away from home. I then noticed a bunch of ...
2
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1answer
2k views

How does IPS terminate/decrypt encrypted traffic?

With regards to IPS, I am not completely across how they are supposed to terminate or decrypt encrypted traffic? It makes absolutely sense to deploy them inline, but how is traffic supposed to be ...
2
votes
1answer
2k views

Setting up a fake AP - problem with iptables and DNS server

Im trying to set up a fake AP using aircrack-ng suite, DHCP server & iptables. After creating the fake AP: airmon-ng start wlan1 airbase-ng -c 11 -e "freewifi" wlan1mon running iptables ...
2
votes
1answer
665 views

Does WPA2 Enterprise also authenticate clients to the 802.1X protected switch port?

In an 802.1X protected LAN, the switch port is usually set to "Multiple Hosts" mode and the access point is configured as an 802.1X supplicant which authenticates to the switch and "opens" the port. ...
2
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3answers
7k views

DDoS on LAN: How to Defend?

DDos on a wired network has to be extremely rare, since the intruder has to be physically connected to the network. However, let's say that it still managed to happen. How would you be able to defend ...
2
votes
1answer
360 views

ARP poisoning attack consequences

For testing purposes, I want to apply promiscuous mode in Wireshark to capture traffic not sent to me. For this, I believe there is the need to poison the ARP table in the switch so that the attacker ...
2
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2answers
7k views

Is it possible to change the admin user/password remotely on a router without logging in? [closed]

Is it possible to change the admin user/password remotely on a router without logging in? If yes, how so?
1
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1answer
820 views

Security w/ Router Behind a Router?

I have a SMB (small-to-medium-business) router (router x) that my workstations run off of in my small business. I wanted to offer my customers wireless internet while they wait for service so I ...
1
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2answers
4k views

What information can be gained from an Email Header?

What information is present in an Email Header that can be used to track a sent mail? For example, are some of these present? Web Browser used? Operating system Type of Network (broadband/dial up)? ...
1
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1answer
229 views

Multiple Independent Levels of Security vs Multilevel security

I am looking for a way to isolate two different networks from each other. Suppose we have 2 different networks (public and private). I am looking for a way to connect to these two networks via a ...
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4answers
339 views

My email hacked

Someone has definitely gained access to two of my alternate emails. I know this by looking at the login activity. By looking at the email logs I discovered that the IP that is always gaining entry to ...
1
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0answers
251 views

Shellcode Injection/Poisoning on Mobile Networks[GSM/LTE/CDMA-varaints]?

In the previous question(How do APN hacks work?) I have enquired about APN hacks but after reseaching more about cellular networks. I wonder has anybody attempted Remote-code execution/poisoning,etc ...
1
vote
1answer
313 views

Accessing WPA/WPA2 password from native auth form on a rogue router

I'm trying to wrap my head around the WPA/WPA2 4-way handshake in an attempt to determine if it is possible for a rogue wireless access point to retrieve a plaintext (or hashed) version of a router's ...
1
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2answers
765 views

PMK is what prevent to generate the PTK and decrypt the traffic?

I'm trying to establish a connection to an encrypted SSID, using scapy. My intent was basically to sniff the frames of the handshake from the victim, acting as a proxy (MITM), and redirect the frames ...
1
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2answers
4k views

connecting a secure computer directly to the internet without a router

If you have a fairly secure computer how dangerous is it to connect to a modem directly without a router in between. Let's say the computer is running Debian as a host and Whonix in VirtualBox, a VPN ...
1
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2answers
122 views

Is it Safe to Send an Invalid Password Back to the Client?

It is common for websites to remember the username input value after an invalid login attempt but not the password input value. Take SE for instance. When I attempt to login with an invalid password: ...