IP spoofing, also known as IP address forgery or a host file hijack, is a hijacking technique in which a cracker masquerades as a trusted host to conceal his identity, spoof a Web site, hijack browsers, or gain access to a network.

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IP Spoofing between subnets

I'm new PT. In a test I was required to do, I was given a port in the segment of 172.13.x.x. I was asked to test if I'm able to reach a server at 172.16.x.x. I was wondering (considering there's ...
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8k views

Is it possible to pass TCP handshake with spoofed IP address?

Little time ago, me and my friends argued if TCP handshake can be passed with a spoofed IP address. Assume I have a https web server that allows only admin's IP numbers. Can anyone connect that web ...
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2answers
158 views

Acceptable secure solution to replace static IP addresses for a web application

I am currently working as a technical lead on a project at a financial institution and have a question about how to provide the same level of security expected by the business in an application we are ...
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4answers
95 views

Is it possible to send HTTP packet via spoofed IP?

I have the following PHP code that writes accepted to a file named text.txt only if the IP is equal to 127.0.0.1 (loopback). If the IP doesn't match it writes denied. <?php $file = fopen('text.txt'...
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3answers
251 views

Unencrypted FTP to transfer encrypted data - okay if IP-restricted?

If unencrypted FTP over the public internet is the only file transfer option for a particular situation, what security concerns are applicable assuming: The data being transferred is strongly ...
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5k views

How does IP address spoofing on the Internet work? Who can do it?

Someone recently told me that the NSA could impersonate pretty much anyone they want by using IP address spoofing on the Internet. But how would that work and to what extend is it true anyway? Could ...
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472 views

Nmap through proxy

Using the following command: nmap --proxy socks4://*.*.*.*:25074 -sV -O --reason scanme.nmap.org I'm not sure if nmap is really using the proxy specified Had an idea of scanning "localhost" or "...
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2answers
55 views

Is there a difference in security between an IP address white list and a domain white list with TLS?

It seems to me that an IP address white list relies on easily spoofed information, while a domain white list, if it forces TLS, at least, relies on the validity of the certificate systems. I may be ...
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55 views

Simulate a lot of different IP's hitting a website

This may sound like launching a DDOS, but I am testing out GEO-IP location on my applications. I need to gather some data, to check how my graphs look when there is a lot of data. Are there any tools ...
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3answers
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How does the hacker manage to spoof a different IP address?

For the last 2 days, +/- every 15 minutes, someone is attempting to sign-in to my online email account. When I verify recent activity, the IP address (and the corresponding country) is different for ...
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122 views

How risky is to to use external DNS servers? [closed]

My infrastructure doesn't have an internal DNS server, so I just forward any DNS request to external DNS servers by iptables rules. I wonder how risk that can be, and how easy is it to spoof DNS or ...
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1answer
50 views

How to perform an idle scan against a target using Nmap with a list of zombies? [closed]

I want to perform port scan against a target but the firewall at the target only allows traffic to the ports through certain IP address/machines. I tried to perform an idle scan in Nmap but it only ...
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1answer
153 views

How restrict is an Asp .Net Web App with ipSecurity enabled?

The IT department of my company refused to host an ASP .Net Web App on our intranet. For security reasons that would be the best solution. Right now I'm considering other options. One of those is to ...
4
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1answer
109 views

Spoofing LAN IP Address Traffic

To give as much detail as possible, I am doing a Pentest for a client that has quite a few "terminal systems" meaning that they are simply a box with a connection back to the main server. These ...
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4answers
4k views

Can one use IP-spoofing to anonymize DDOS attacks?

Since it is possible to fake the source-ip of an ip-package, is it also possible to anonymize DDOS-attacks?
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1answer
119 views

How to defend against a Spoofed-IP Blacklist DOS attack?

So I've implemented an IP Blacklist for the /login endpoint on my server. If any IP fails to login more than x number of attempts in x number of minutes the requesting IP is blacklisted for x number ...
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1answer
75 views

What other attacks can be deployed using IP spoofing other than DoS(and DDoS) attacks ?

I want to know the other attacks which are associated with IP spoofing because, we're trying to implement Source Address Validation (SAVA) and wanted to where else can Source Address validation ...
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1answer
84 views

Wired Deauth-Like Attacks

[story] Good Evening Guys, I just got out of a lan house which uses a system named Geto (Geto Lan House Management System 4.0), and I was wondering if it is hackable. [/story] While searching for ...
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3answers
29k views

How to find the actual address of spoofed IPs?

I am convinced that it is possible to find out the real IP address of computer which has spoofed its address. I find it rather unlikely that no techniques exist against IP spoofing. How is it ...
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2answers
2k views

In what scenarios is relying on source IP address as a security control acceptable/unacceptable?

A number of questions on this site mention relying on source IP address as a control and in most of them it is dismissed as being unreliable. In what circumstances might using source IP address as a ...
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3answers
1k views

Reveal the True IP of a User

Is there any best practice method (and preferably documented) way of revealing the True IP of a user using a HTTP(S) connection? I.e.: To be able to uncover the true IP from transparent as well as ...
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1answer
93 views

Spoofing IP address as being local over the Internet

I know it is trivial to spoof your IP address with UDP: simply change the value of the source address in the IP header and the recipient has no idea where the packet actually came from. My question ...
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2answers
186 views

IP Spoofing: How secure is to control access by user’s public IP address?

We have a few Windows server VMs hosted in Amazon cloud. Users need to enter account and password to RDP to the VMs. The VMs’ RDP EndPoint (IP+Port) is public to the internet. As an extra security ...
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2answers
224 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 ...
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2answers
555 views

Is IP spoofing still a threat in the Internet?

I heard that IP spoofing is now mostly blocked by ISPs, especially on the consumer-grade links. Is there any research on the number of networks that still allow users to spoof an IP packet with an ...
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143 views

How to know somebody's IP? (Fraud victim) [duplicate]

I was victim of fraud (fool me) in Mexico and my only hint is a GMail account, so I can contact him from an anonymous mail. From what I've read, GMail's headers don't contain the sender's IP. What ...
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6answers
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What security risks does IP spoofing bring?

By manipulating the TCP packet and changing the source address one is able to spoof the IP. As I understand it, you will not be able to set up a full handshake by doing this, as you will never receive ...
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Why don't ISPs filter on source address to prevent spoofing?

I'm under the impression that if all the ISPs were required to filter on the source IP address of all outbound packets, that spoofing would be reduced considerably. Are any ISPs implementing this ...
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1answer
294 views

Can a hacker use someone else's IP address when running a scam?

I have a friend who works on a ship currently in Accra, Ghana. We do video chats but his system is extremely slow and sluggish. There have been times where our only form of communication is IM. A ...
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589 views

How to spoof my IP address to JavaScript and other security concerns

Many websites require JavaScript. However, enabling JS means that a website can run a JS snippet to retrieve the user's IP address (even if they are behind a proxy or VPN). So, how can I (the user) ...
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2answers
1k views

Spoof IP adress after a TCP handshake

I know it is not possible to perform a successful TCP Handshake with a spoofed IP-Address. However I wonder: Is it possible to spoof the IP once a TCP handshake was performed successfully? For ...
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3k views

Difference between X-Forwarded-For IP, X-Real-IP, VPNs and TOR

I have this Google Chrome Privacy Preserving Extension that I am working on. Where I can spoof the header information e.g user agents and else. When I spoof X-Forwarded-For IP and go to http://...
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How does a server obtain the IP Address of a user?

How does a server obtain the IP Address of a user? Is it possible to fool the server by spoofing the IP Address?
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6answers
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Why can't we block DNS Amplification attack by blocking UDP packets or DNS response packet?

I mean if the attacker tries to ask all the open DNS resolver respond to a web server. The web server can just block its UDP ports. If the all the DNS response go to a Authoritative Nameserver(victim)...
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149 views

Faking IP address without being aware of returning response

I read different articles on the subject (Spoofing IP address), someone said: Spoofing an IP is usually better suited to "fire-an-forget" scenarios like DDoS. due to TCP two-way communication ...
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Spoofed IPv4 and IPv6 addresses over the internet

I have a few questions regarding IPv4 and IPv6 spoofing. Might as well just list them to be concise: What's the usual routing policy for ISPs' routers in regards to spoofed source addresses? i.e. if ...
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312 views

“[!] Something went wrong.. Try again” sendmail with setoolkit in kali behind tor

I've been working in a little project, and the goal right now is spoof an e-mail address. That simple, but doing it in an elegant way. I've done the following, using Kali on a VM (in VirtualBox) I ...
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1answer
102 views

DNS resolution attacks by flooding spoofed replies

Each DNS request has an ID of 16bits. In the event that an adversary is unable to sniff the query, a way to spoof the DNS reply is to flood the resolver with many replies. Request from victim Query ...
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59 views

Making a Judgement on a User's IP Usage

We have a click exchange-type web application that allows users to receive stats boosts within a game. Stats boosts are based off unique IP addresses which poses a problem for users who use proxies or ...
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3k views

How to track down an IP spoofer?

We just installed a SonicWALL NSA 3500 and I've noticed a few times per day there will be an alert entry like this: Time: 01/02/2013 9:00:41.000 Priority: Alert Category: Intrusion Prevention ...
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1answer
544 views

Can IPs be trusted inside a VPN?

Question I have several linux clients connected to an OpenVPN server. Each client is given a persistent IP based on their X509 Common Name. Can I trust these IPs ? Context I have Client1 and ...
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1answer
319 views

Explain the last part of how Mitnick hacked Tsutomu Shimomura with an IP sequence attack

I was reading up on why TCP ISNs need to be randomized, which led me to this write up by Tsutomu Shimomura. I understood how IP address spoofing and predicting the ISN helped the attacker establish a ...
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222 views

Need To Learn About IP Address

I work on a U.S. government crisis/suicide hotline as a rescue coordinator. We receive phone calls, (mostly cell) text, and, chat from all over the world. Most times the caller/chatter will not ...
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5answers
19k views

Does chatting over Skype expose my IP address?

Is there a way to identify a person's IP address in Skype, when you're chatting with them? Does this depend on their Skype settings? And if you've recorded chat messages, can they lead to the actual ...
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2answers
159 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 ...
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Basics - IP spoofing

I can't understand why IP spoofing (even basic) is very limited. Suppose Bob and Alice are about to communicate and Eve can see network communication, why eve can't use IP spoofing for making "Man ...
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Why is it difficult to catch “Anonymous” or “Lulzsec” (groups)?

I'm not security literate, and if I was, I probably wouldn't be asking this question. As a regular tech news follower, I'm really surprised by the outrage of Anonymous (hacker group), but as a ...
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223 views

Is it safe to use IP Addresses as an identity?

I have a website where users can generate links. I'd like to limit 10 links to a user, but would also like to avoid requiring a login/email. I was thinking about using the IP Address as an identity ...
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253 views

How to keep an internal node from spoofing an internal server's IP and thereby getting the server blocked by active defenses?

In an internal network, all machines are firewalled from each other. The firewall has port scan detection and blocking mechanism (say, psd module of iptables). Question: What are the ways I can block ...
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1answer
56 views

Virtualisation: security on the host side

Virtualised environments are focused on isolating the guest OS. Using the VirtualBox model, the guest might be behind a virtual NAT and/or talk only with other VMs via internal networks, and only ...