Spoofing is an activity when a person or program try to impersonates itself as another.

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How can a WiFi router recognize MAC address change of a connected device? [migrated]

My teen son and I are playing a hacking game. I've installed an WiFi router with parental controls, MAC filtering, VPN, etc. I block Internet for him, he tries to break out of the cage (for now I'm ...
3
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1answer
43 views

Exchange not checking SPF record for own domain

I have an interesting issue with Exchange where it appears to check and stamp spoofed messages from external domains but not ones it has setup to send from. For example I can spoof a message from ...
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1answer
140 views

How can I prevent spoofed emails from outside thats using my internal accepted domain

I'm receiving spam emails sent from my own domain to my own domain. I'm using Exchange 2013. Example: myemail@mydomain.com is being used to send spam to myemail@mydomain.com. I can successfully ...
0
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1answer
49 views

Spoofing a duplicate MAC address on an interface not connecting to the network where the original MAC is

I'm trying to run a PHP project on a test server. The project uses an internal framework that has been modified so it will only run on the production server by checking the MAC address in eth0, and ...
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0answers
25 views

Mail spoofing or server infected

Today I received this email in my inbox. 2 IP appear in "FROM" in the body email. One of them is IP of my hosting provider. But is not the IP of my website neither from I send emails . it might be ...
2
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1answer
55 views

Using SPF for spoof protection

I'm trying to work through properly configuring SPF for my domain. We have two MX servers that only receive mail, and two outbound relay servers which we expect to list in our SPF record. We also ...
0
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1answer
66 views

What will happen in a network if multiple devices have the same MAC address? [closed]

What will happen in something like a wifi connection where different laptops are set with the same MAC address . To make it more interesting what will happen if there are multiple devices with same ...
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4answers
260 views

Setting up an SPF record for a shared hosting service with lots of email gateways

My website is on a Hostgator shared host, and I need to set up SPF for my email so my outgoing emails won't get bounced. So, I have to add a TXT record to the DNS for my domain, listing all possible ...
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0answers
58 views

How can I reject mails coming from a fake domain or a fake user in a real domain?

I have an exchange server 2010 recently installed and I receive a test with 3 step to check the security of my server. below the test Check if my server receive from fake domain. Check if my server ...
1
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1answer
82 views

Prevent IP Spoofing on OpenVPN tun

I have a question regarding IP Spoofing and authentication. I have an OpenVPN server in TUN mode with many untrusted clients in the same VPN network, and I was wondering if one client is able to spoof ...
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1answer
45 views

Is it possible to make me send an email by opening a malicious email? [closed]

I know I don't have much info on this problem/question so I will delete if everyone downvotes or votes to close/delete. Is it possible for someone to make an email look like I sent it simply by me ...
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0answers
133 views

Email Spoofed From Exchange Server

One of my exchange users got an email that bounced back to them. They did not send the email and I'm a little confused at how they got it. I looked through the logs and do not see the email leaving ...
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2answers
32 views

Can a DNS server (specified by its IP address) be spoofed?

When a DNS server is specified (in my case in OS X, in the Network Preferences), can it be spoofed (for instance by an organization with the power of a government)? I am asking the question because ...
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1answer
181 views

Can I use ASA5505 to spoof the reply to a heartbeat request?

I have a CISCO ASA 5505 in a home office. It has two subnet, public and private. There is a wifi belkin router on the private net, which provides wifi for some users. That belkin router sends out ...
2
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1answer
323 views

Dovecot Sieve allows spoofing through LMTP

I have set up Postfix to block spoofing your email (you can only send emails as yourself): smtpd_sender_restrictions = reject_authenticated_sender_login_mismatch I have set up Sieve and ...
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1answer
82 views

What use are systems that ban IP addresses if all the evildoers spoof them anyways

Many anti-spam or web applications with a security component give the ability to ban IP addresses. In my experience any bot, person or other entity that is truly nefarious is using an endless supply ...
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1answer
526 views

Any way to block IP address host header spoofing?

I have already added the following the following to my nginx config to deal with spoofed domains: if ($host !~* ^(.*example.org|\d+\.\d+\.\d+\.\d+)$ ) { return 444; } Right now ...
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0answers
286 views

How To Stop Cisco ASA Spoof Attack

I have thousands of "Deny TCP reverse path check from 10.60.60.X to 10.60.6X.X on interface outside" The IP addresses for the source and destination hosts are all over the board, and the interface is ...
0
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1answer
146 views

Brute force attacks with server's IP

I am running a Debian wheezy server with fail2ban installed, everything works as expected but recently my own server got banned. I added the server's IP in the exception row and it seems to work, but ...
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2answers
420 views

Wrong DNS answer with CNAME and A Record at the same time

We had a customer which has set a CNAME Record for his domain. Somehow he managed it to set an A Record too, which should be not possible and is forbidden by DNS. But the result was: $ dig ...
5
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1answer
1k views

Does postfix reject spoofed senders?

Is there a reliable way to reject incoming mails with a spoofed e-mail address? What kind of checks does postfix run normally on incoming mails? does postfix check the reverse dns by default? does ...
0
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1answer
31 views

how to discourage email spoofing

One of my production server emails look like to be spoofed from another network. The team (group or individual or professional company) is sending mass mails out to their list of users, using our ...
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1answer
131 views

Security against IP spoofing without consulting network administrator [duplicate]

I was wondering that if there is a Local Area Network and one public IP,through which various clients connect(which have been allocated private IP's).Suppose one of the clients spoofs his IP to try to ...
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1answer
538 views

Practical way to implement prevention of IP Spoofing

I am an undergraduate Computer Science student and was hoping to gain some knowledge of ways to help prevent IP spoofing but all the resources I have tried out elaborate this concept in a theoretical ...
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1answer
5k views

Exchange 2010 email spoofing prevention

Masters, Unfortunately we got some spam mail which seems to be coming from our own domain. I found some article which all says to remove Anonymous login from internet receive connector ...
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2answers
354 views

Protecting my Bind dns server from slow kaminsky-style cache poisoning attacks

Dan Kaminsky described how DNS servers could be poisoned with spoofed DNS responses [1]. As I understand it, the problem was that Kaminsky found a way to account for most other sources of randomness ...
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1answer
89 views

DNS request anomaly

Experts, i have some problem in DNS servers configuration, network diagram is shown in figure: The problem is manifesting as follows: There're 2 DNS servers servicing both internal and external ...
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0answers
887 views

Woes with named/bind and forwarding zones

I'm sadly restricted to a very old version of bind (9.4.2) This is the think. If I setup bind with a named.conf and only forwarding it works perfect. acl clients { any ; }; options { ...
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2answers
306 views

How to spoof an IP for application that needs this particular IP?

In general, such a problem, there is a system RHEL 6.4 Server with a pair of network interfaces combined into one by bonding. This system IP address: 10.7.7.1. Next on the system running an ...
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2answers
274 views

Spoofing NS records for pre-transfer DNS testing

I'm about to transfer a domain from one registrar and DNS provider to another, and I want to test the new DNS host before starting the transfer. The new host provides plain DNS service beforehand, so ...
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2answers
404 views

Spoof database connection to be local instead of remote

I am trying to connect one of our clients "as is" programs to a remote database instead of a local one, they think that they have coded it to work that way, but for some reason the program crashes ...
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1answer
184 views

Bingbot spoof localhost ip

So here is a fun one. I'm getting bingbot requests at a certain time everyday that kill the server. Here is the request: 127.0.0.1 - - [14/Sep/2013:08:18:49 -0500] "GET / HTTP/1.1" 200 82810 "-" ...
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1answer
45 views

Should I move servers and change email address after email spoofing? [duplicate]

I'm hoping the community can help me shed some light on a recent email spoof. Yesterday my client woke up to find hundreds of bounced failure notices. The client did not personally send any of these ...
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1answer
587 views

“From:” e-mail header spoofing - how to verify such mail?

I'm facing a problem of verifying a "From:" message field in e-mail messages, in terms of e-mail spoofing. I am currently using SPF and DKIM to verify the origin and integrity of messages, but as far ...
2
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2answers
141 views

If I use iptables to allow TCP connections only from a specific IP, can it be faked?

An iptables rule on my database server is: -A INPUT -p tcp --dport 6432 -s 10.115.0.150 -j ACCEPT I have other rules (loopback, etc.), but I'm wondering if that specific rule can be "hacked". Can ...
0
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1answer
350 views

Counter MAC Spoofing with Cisco

I was wondering if someone could help me with the needed cisco commands to configure a switch to only allow certain mac addresses on certain ports. So that one mac adres can only connect to the ...
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1answer
497 views

Tracking anonymous e-mail threat

A user spoofed/sent an email from http://emkei.cz/ with a very serious threat. Is it possible to trace this back or are we SOL? There wasn't much in the email headers other than that it came from ...
0
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1answer
421 views

Can a machine(physical or virtual) accept and process UDP packets with a different IP address coming from a known device?

Before everything, thanks for reading the next question. I have script,(ipUDPspoof.rb), which is a client/server script in Ruby (you choose the parameter 1 to be server and 0 to be client, at ...
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2answers
176 views

SSH:using single public key on multiple remote machines and spoofing-by-known-server

Lyrics Usually, people say, that using single public key on several servers is just as secure as using unique public keys on each of them. (If we're not talking about possibility of private key being ...
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2answers
3k views

oidentd properly configured yet not properly working on CentOS 6

I've been experiencing this problem with oidentd for a couple of days and I can't seem to be able to find a solution to this yet. oidentd seems to give me headaches every time I want to get it work on ...
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1answer
378 views

Finding spoofed IP address on network

I have a few IP spoof dropped messages coming out of my Sonicwall firewall, we'll call them Source A and Source B. Both of these sources have the same mac address indicating they're coming from the ...
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3answers
3k views

Exchange and SPF Records

I've created an SPF record on 123-Reg, which is working great. But my question is how Exchange servers know that an SPF record exists when they receive mail from a domain. How does Exchange know it ...
2
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1answer
843 views

Prevent mail server (sendmail) used to backscatter

Hi I recently got an email from Amazon, saying that my EC2 instance is sending spam. So what they say is my mail server is receiving email for a non-existing user and therefore bounces the email back ...
3
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1answer
761 views

How did this email bypass my SPF settings?

I received a phishing email this morning that appeared to come from one of my addresses to itself. Looking at the headers, I found something interesting. DomainKey-Status: no signature ...
3
votes
3answers
349 views

How to Limit the Damage of Domain Spoofing

My e-mail account, for my privately run business which I'll call "VeryCoolCompany", is starting to receive bounce-backs for users who don't exist, like these: alan12ab1@verycoolcompany.com ...
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5answers
886 views

Any way I can correct DNS spoofing against our domain

This morning I found out that our domain and subdomains have been poisoned on the 4.2.2 and 4.2.2.1 DNS servers along with others I think, though I have not confirmed others yet. Using OpenDNS ...
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2answers
4k views

ISP login, MAC spoofing, WiFi and multiple devices

I have a Tikona Digital Broadband (WiMax based) Internet Connection which allows limited number of devices to be connected at a time and also requires that the users login with username and password ...
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6answers
4k views

How reliable are IP address-based firewall restrictions?

On some of my production systems that need to be accessible outside of the LAN I will sometimes add a firewall restriction at the edge to only permit traffic on, say, RDP from a specific origin IP ...
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2answers
4k views

Different Mac address to virtual interface and primary interface

I am developing a system, where I need virtual interface to have different mac address for my primary and virtual interface lets say my mac for eth0 is 00:11:00:11:00:11 and my virtual interface is ...
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1answer
1k views

When a client sends a RST packet, will the server close the connection ?

What I'm trying to do is block RST attacks with IPTables. When I do a search for it, I'm seeing rules where packets with the RST flag set is being rate limited. I'm questioning it a little bit. I ...