Network Security - securing network infrastructure and connections

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1answer
846 views

Router detecting constant ack flood attacks and port scans

I first noticed this yesterday in my logs - while I was configuring the router settings, so I don't know how long it's been going on. What should I do? I reconfigured my router with more secure ...
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0answers
86 views

How can I launch DHCP starvation attack in WLAN?

In WLAN, due to MAC association on Access Point (AP), I can't send the DHCPDISCOVER messages using random MAC addresses. But if I keep my original MAC address as the source ethernet MAC a and random ...
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1answer
118 views

Segregating a Printer in my Enterprise Network

I have a EAP-TLS network at home which I've managed for some time now. I just got a new Brother HL-5470 printer so I can finally print things at home, which is really nice. The only problem is that ...
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1answer
759 views

How to properly test that an OpenVPN connection is secured?

I have a router (ASUS RT-AC66U) with an embedded OpenVPN server. I'm able to successfully connect to the OpenVPN on the router, as well as, access internal services in my home network; However, ...
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1answer
136 views

Is End to End encryption possible for all servers across the whole infrastructure?

Running into a possible situation where a client I am working with is requesting that all data that leaves the servers should be encrypted and here, we are talking of hundreds of Linux servers ...
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1answer
104 views

Is it common for all hard / USB drives to be accessible to everyone on a network?

Every PC can map to any other PC's hard drive(s) / USB drive(s) on the network where I work. When I realized this I thought it was odd. All one needs to do is access the (Start) button then type ...
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4answers
3k views

How to prevent network administrators from accessing USB drive

How can I prevent network administrators from accessing, mapping to etc. a USB drive that's in a PC on their network? I'm mainly concerned about files being edited or deleted.
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0answers
144 views

Performing an airport scan on my Mac for available WiFi networks pulls up multiple SSID with different mac address. What's going on?

I performed the following command to search for available WiFi networks in my apartment complex: /System/Library/PrivateFrameworks/Apple80211.framework/Versions/A/Resources/airport scan | grep OBC I ...
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1answer
63 views

Is it possible to bypass sniffing when using port mirroring?

INTERNET <-A-> ROUTER <-B-> PC Let's theoretically think we mirror the port on a ROUTER to a file. So the full network traffic on it. Question: is it possible to still have ...
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89 views

Why would home routers accept incoming DNS traffic?

I stumbled upon an interesting paper (PDF Link) where researchers found out that more than 58% of the DNS open resolvers that are blamed in DDoS attacks are in fact home routers distributed by ISPs to ...
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2answers
132 views

Place database in the DMZ and in the internal network

Is it sufficient to have single database inside the DMZ which the webservers in the DMZ receives their data from. Or if setup with two databases is a better solution, that would be to have a ...
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1answer
118 views

What precautions I can take to secure software against user?

I want to build a client that connects to my server and uses server API. You can consider this as a banking application because data security is the most important thing. Since the users or hackers ...
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2answers
194 views

Possible to detect an/or shut off CryptoLocker by limiting total network bytes transferred?

Since a virus infected PC has to download (encrypt) reupload the entire file (to a file server), and repeat the process for every network drive, is is possible to detect this unusually high bandwidth ...
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1answer
153 views

Ideas on how I can fragment captured network traffic?

I am trying to create a lab environment where I can analyze common IDS solutions (starting with Snort specifically) and their ability to reassemble fragmented IP trains. I have a collection of ...
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2answers
66 views

Is it possible to take back the control from an MITM in progress? [closed]

I heard that MITM also involves DNS poisoning, which basically tells the Net to take a different route than it was supposed to go.. (I'm not sure if my interpretation is correct..) Given there is an ...
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3answers
413 views

Can workplace wifi track ip address to an employee's computer? [duplicate]

At my work there is secure WiFi for all the employees. If someone has sent harrassment / sexual harrassment emails to me through the company WiFi, is there a way for my company to trace the IP address ...
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2answers
166 views

Can changing a MAC address give an attacker more leverage in a network?

Security lessons force us to use limited users (Standard User) on Windows networks. I found that an administrator account can change his MAC address from Control Panel\Network and Internet\Network ...
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3answers
206 views

Such a thing as too much network segregation?

One of the biggest points of friction I see between networking teams, security teams, and users is around the idea of network segregation. For instance, the network team wants to isolate everyone ...
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1answer
508 views

Kaspersky Antivirus “secure connection scan” as broken as Superfish?

I've read a lot about Superfish (and similar ad-ware) lately and I basically understand the vulnerability to MITM attacks. But I'm actually wondering if the "secure connection scan" by Kaspersky ...
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1answer
54 views

different IP addresses [closed]

I'm new in the Network world so I'm still trying to figure things out. I have a server with an IP address like 192.168.1 etc. There is other devices that communicate and share information with the ...
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1answer
80 views

Internal network security policy for development environment

What are the best practices for network security for an internal development environment. Besides adhering to updates, antivirus, and firewall. For instance, is it recommended to use an IDS/IPS like ...
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2answers
123 views

Expose the source code repository externally or allow VPN access?

To allow third party consultants, offshore developers and contractors working on the code, we can expose our Git repository externally. Or we can grant VPN access to the external parties and limit ...
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1answer
73 views

How to fuzz service with sending bad data?

I am reading a post about fuzzer in Python, here is the code: # Import the required modulees the script will leverage # This lets us use the functions in the modules instead of writing the code from ...
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1answer
106 views

What's the interest for web proxy over transparent proxy

A network I'm working on has only a web proxy (http, https) to communicate outside (mostly used for cache purposes, not whitelist or blacklist support). This requires lot of configuration to all tools ...
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1answer
92 views

How does the DNS-spoofer know the original destination of the packet?

It's perhaps my lack of deeper knowledge of how the DNS, NAT or TCP works, but I have been thinking about the following scenario and can't figure out the following problem which arises in DNS-spoofing ...
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1answer
159 views

Why does my web server receive so many TCP resets from some clients?

I run a web server and log connections that are dropped. Occasionally, I get a burst of TCP RST packets from some of my clients, like this: Feb 11 11:56:29 SRC=1.2.3.4 TTL=57 SPT=38383 DPT=80 ...
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2answers
541 views

List of most common network vulnerabilities a la OWASP Top 10 [closed]

I am trying to find the most commonly used attack vectors/techniques on computer networks in the style of the owasp top 10, for my thesis work. The reports shouldn't be older than 2-3 years. Can you ...
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2answers
283 views

Prevent hacking with known IP address and router information on Ubuntu 14.04 LTS [closed]

I’ve had it! It is the second time that a “hacker” (A hacker or should I say thief) has had access to my Ubuntu 14.04 LTS system. The person that I suspect has had physical access to my pc because he ...
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1answer
325 views

Snort even though working properly does not report majority of rules

I have installed Snort 2.9.7.0 and it does not detect majority of attacks, such as nmap port scans, downloading exe files, opening documents containing keyword "root". I use Snort together with ...
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2answers
92 views

Determine if compressed or encrypted [closed]

I have a bunch of network data and I would like to determine if it is either 1) encrypted or 2) compressed. I doubt it is both, but the potential exists. If I am assuming that the traditional ...
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2answers
536 views

I've shared my WiFi with my neighbour. How can I ensure they're not downloading illegal content?

I want to ensure they're not downloading any illegal content (torrent websites in particular). If they're using a VPN or Tor, then I guess there's not much I can do, but if they're just connecting ...
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2answers
221 views

How to retrieve the MAC address of a remote IP [closed]

I have an IP address, and I want to find the corresponding MAC address. The IP address is in the same city, so we're connecting to the same network. How do I find the corresponding MAC address?
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1answer
114 views

How can the sybil attack be used on a P2P system that implements DHT?

I was reading about the sybil attack and am unclear on some details. After becoming part of the peer-to-peer network, the adversary may then overhear communications or act maliciously. By ...
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3answers
159 views

How to organize a CTF?

In the context of an IT event, my team would organize a CTF (Capture The Flag). About the challenges (we’re working on them). I want to have some references on the types and levels of difficulty that ...
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1answer
618 views

Checksums do not match when I download file over http

Just for the test I did the following: Downloaded a page from wikipedia via wget on remote server and named the file test.dat. Then I executed md5sum. I download the file via http and check it back ...
3
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1answer
216 views

What constitutes an exploit? I was able to compromise my common household router

Was setting up Wifi at home today (just using the default router Time Warner Cable provides) and was appalled at the minimal security that the web server provides. Default user name/password is ...
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3answers
159 views

Decrypting SSL over a Mobile Network

I work for a large company and we are trying to judge the safety of some proprietary information that is being sent and received in a new application we are developing. After our initial testing we ...
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76 views

Is WPA practically less secure than WPA2 only if QoS is enabled?

I've been looking into attacks that are effective against WPA-TKIP but not WPA2-AES (both using PSK). I've found Vanhoef & Piessens's paper that builds off an attack by Beck & Tews and can be ...
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2answers
1k views

What's the diff between blocking a port with a firewall and not starting a service on that port in the first place?

I was considering setting up a software firewall (pf) on my web server and did some research on them. Were I to do it, it'd involve basically blocking connections to all ports except 80, 443, and the ...
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1answer
167 views

Securing my network: unmasking spoofed mac possible?

In Kali you can: airmon-ng start wlan0 ifconfig mon0 down macchanger -r mon0 (-r changes mac id to a random number) ifconfig mon0 up This attack for example: aireplay-ng -0 2 -a [ap mac #] -c ...
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2answers
523 views

Persistent Connection Attempts By Akamai Technologies

I have seen this question asked in different places, but have never seen a satisfactory answer: On different computer builds, ASUS/GIGABYTE/MSI, I constantly have outgoing connections to ...
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1answer
75 views

How safe are networking ACLs based on IP-address?

As far as I know, a determined attacker would have no major issues in hacking the IP address of the packets contained by his (web) request. Therefore, I cannot see how an Access Control List (such as ...
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2answers
326 views

In detail, how does SSL offloading/acceleration/termination work?

What is the in-depth working mechanism of SSL offloading/termination? I could not find literature that would dive deep enough into the subject. Assume the following example, where a intends to ...
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1answer
95 views

Why do private networks use both X.509 and User/Password authentication

For example, the school network I am on requires both a name & password to log in along with having its X.509 certificate installed in my browser. Why does it need both? Shouldn't name and ...
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0answers
88 views

Two similar computeres on same network, different traceroutes (one slow - one fast) [closed]

My SO's computer has a very slow internet connection. So I compared her traceroute to xkcd.com with mine. We are on the same network, on both on os-x. It's a simple 4g home router. tracerouter ...
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3answers
116 views

Can the packets of a wireless network be sniffed by a user who is not present in that network?

1.If an user knows the frequency used by a wireless network, is he able to collect the packets from that network? Those packets may be encrypted, but can he collect those packets? 2.If the user has ...
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1answer
250 views

Security criteria for selecting a network switch?

I am looking to purchase a switch with 24+ ports. The set of security criteria that I should bear in mind when selecting a switch is not clear to me. I have tried to take other networking security ...
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1answer
114 views

Compromised submarine cables and the consequences to internet?

I recently read an article that Google wants to build a submarine cable connecting to my country supposedly to increase overall speed and while I hope my government will never allow this kind of thing ...
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3answers
9k views

What is the best home wireless network encryption algorithm to use?

What is the best home wireless network encryption algorithm to use? I realize the best answer will probably change over time, and hopefully people can provide updated answers as new standards come ...
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2answers
121 views

Am I exposing my application to IP address forgery / ip spoofing?

Here is my setup: I will create two REST services that are run on Server B and should only be called from Server A. Both servers are on the same network and I am not able to configure a firewall to ...