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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1answer
986 views

Brute force login attempt from spoofed IP's

I see that many of my WordPress installs are being hit with 1000+ failed login attempts using non-existing 'admin' account name. The requests come from different IP's every time, and I see IP's such ...
-1
votes
1answer
321 views

how to secure my login user id and passwords specially for facebook [closed]

i think they hack me with facebook cookies. i dont get what exactly is going on with me. every time i get the login notification from another ip location.i want to secure my cookies and i wanted to ...
3
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2answers
266 views

Can ipopts be used to circumvent a pf or iptables firewall source IP based blocking?

Can one use ipopts, and in particular IP source routing, to circumvent source-based blocking in pf or iptables? For example, with OpenBSD's pf: block in all # default deny block out all pass in on ...
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2answers
5k views

How can I spoof my IP address using the PHP curl function? [closed]

I want to spoof my IP address with the PHP curl function. I'm sending requests to a server with PHP curl, my IP address is $ip2, but I want the server to believe that the request is coming from $ip1. ...
12
votes
6answers
1k views

What tools are available to identify which country a specific IP address is located in?

In trying to identify the country a user logs in from, or to block country ranges for whatever reason (for example regulatory requirements) what tools, whether online or offline, are available?
2
votes
1answer
3k views

Stopping Session Hijacking

If you noticed, I put "stopping" instead "preventing" in the title because I want my PHP application to be as secure as possible. I am wondering if anyone has any better ways to prevent session ...
6
votes
1answer
185 views

Parabolic Denial Of Service — Would it work?

Would this DoS attack be effective: Attacker determines target (10.0.0.1) Attacker sends ack packets to a buch of web servers with a src addr of 10.0.0.1 Servers reply to 10.0.0.1 with syn packets ...
4
votes
1answer
837 views

172.16.33.197, 127.0.0.1 IP addresses in visitor logs

I have a website running Apache and PHP. I see that there are visitors with IP addresses 172.16.33.197 and 127.0.0.1. These addresses do not belong to our network. I get the visitor IP addresses with ...
1
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2answers
178 views

IP attack by reading/writing data?

If I remember correctly there is an ICMP attack whereby you can embed malicious code and it gets read/executed, causing the problem (similar to SQL injection). Are there any further/more dangerous ...
10
votes
4answers
2k views

Why don't ISPs filter on source address to prevent spoofing?

I'm under the impression that if all the ISP's were required to filter on the source IP address of all outbound packets, that spoofing would be reduced considerably. Are any ISPs implementing this ...
1
vote
2answers
714 views

Why wireshark source ip tab lists other ip as well

I was trying to capture some packets using Wireshark. I could find a lots of ip in the source address tab. Which ip do they represent. Which all packets are visible to wireshark when I run it in my ...
14
votes
6answers
5k views

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?
4
votes
3answers
12k views

How can I trace the IP address of person in chat?

Is it possible to trace my IP address when I am chatting with others (with gtalk or Facebook)? If so, how could someone do that?
6
votes
5answers
3k views

GET request with different IPs

I need to check vulnerability in my polling system. So I need to send GET requests but every time with different IPs. Can anyone suggest something?
3
votes
3answers
1k views

How can I make it more difficult for a user to create multiple accounts?

I would like to know the best way to increase security on a website so that the a single user can't create multiple accounts. What all of a user can be traced? I'm thinking: IP address Mac address ...
16
votes
6answers
2k views

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 ...
1
vote
4answers
12k views

Netcat IP Spoofing

I am connecting to a server nc -v 192.168.0.1 1111 But I want to do IP spoofing because the server on 192.168.0.1 only accepting commands from 7.7.7.7. We are two friends, I am 192.168.1.1, and my ...
11
votes
3answers
7k views

Can I trust the source IP of an HTTP request?

As far as I've understood, if you try to issue a HTTP request with a spoofed IP address, then the TCP handshake fails, so it's not possible to complete the HTTP request, because the SYN/ACK from the ...
1
vote
2answers
2k views

IP Spoofing a threat?

Quick Security Question if i may. We have an internal Intranet system which is only accessible from a few internal vlans, our main external firewall blocks all access to the internal webserver – or ...
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votes
0answers
73 views

IP Adress Spofing via ncat,nc etc [duplicate]

Possible Duplicate: Netcat IP Spoofing I want to ask one question to you. My friend and i playing game together.He is using below command this computer. ncat -u -c /bin/bash --allow ...
6
votes
1answer
441 views

Ingress RFC1918 spoofing: How to handle it?

I've seen packets originating from RFC1918 addresses from two fairly large european ISP's (ASN1257 & smaller ASN35706) coming in on eBGP transit links lately, and I'm a bit puzzled why it wouldn't ...
4
votes
3answers
2k views

How secure can IP based login be?

From several security books and sites I understand that IP-based security (with which I mean: user is verified only by IP address) is a bad idea. Our idea is not new: we want a one-time validation and ...
3
votes
2answers
772 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 ...
4
votes
5answers
2k views

Is it trivial to bypass IP blocking?

There is a site with IP blocking. When a client makes too many invalid attempts when guessing e.g. password, then their IP address becomes blocked. I've heard about IP spoofing and similar attacks. ...
9
votes
2answers
2k views

Is IP spoofing relevant to TCP? Is it relevant for TLS or SSH?

I have read the TCP Connection Establishment on Wikipedia In brief the packets to start are SYN, with a (hopefully) random sequence number A from the client. SYN-ACK, responding, with A+1 and ...
5
votes
2answers
12k 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 ...
5
votes
2answers
2k views

Why would the browser present the certificate for an unknown outside site?

The first time each day that I attempt click on the 'Mail' link from the Yahoo home page, my browser (Seamonkey) throws up a dialog with the title 'Secure connection failed'. The content in the ...
3
votes
1answer
3k views

Spoofing email From address

Providing all legal measures are taken care of, what are some of the ways someone can spoof an email "From" field address and actually get the email to the recipient without spam filters getting in ...
8
votes
1answer
925 views

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 ...
9
votes
2answers
6k views

How easy/difficult is it to spoof DNS? Are some scenarios safer/more risky than others?

Practically speaking, how easy difficult is it to spoof DNS? What scenarios are more risky than others? For example: A phishing email or twitter link that attracts users to click a hyperlink A ...
0
votes
0answers
79 views

Pages restricted to certain IPs, safe? [duplicate]

Possible Duplicate: In what scenarios is relying on source IP address as a security control acceptable/unacceptable? If a website has a page which only renders for certain IPs, is there ...
5
votes
3answers
472 views

Solaris: IP Spoofing Across Ethernet Ports

Given a Solaris machine with two network interfaces corresponding to the separate ethernet ports in the back. 0: 192.168.0.5/255.255.255.0 1: 192.168.1.5/255.255.255.0 with /etc/defaultrouter set ...
3
votes
1answer
398 views

What kind of nefarious deeds can IP address Spoofing be used for? [duplicate]

Possible Duplicate: What security risks does IP spoofing bring? I found this article, which seems pretty good but was written in 2003 so I'm not sure how up to date it is. Can IP address ...
6
votes
4answers
847 views

How can a company reduce exposure to packet spoofing? What solution should exist, but doesn't?

I'd like to understand what anti-packet-spoofing technology exists (or should exist) to verify an inbound packet. Maybe this is as simple as a Cisco ACL, Firewall Rule, implemented at the network ...
16
votes
2answers
846 views

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

I've noticed that there's a number of questions where relying on source IP address as a control gets mentioned and in most gets dismissed as being unreliable. I'd be interested in hearing from anyone ...
8
votes
3answers
310 views

Verify a website user is behind corporate firewall?

We have a public ecommerce website hosted at our datacenter onsite. For people who are within the corporate firewall hitting the website I want to display profiling information about the request of ...
2
votes
1answer
338 views

IP Conflicts / Spoofing

Are there any products / os that behave differently when an duplicate IP address is detected. This may indicate an IP spoof ? Can TCP stack 'shutdown' or stop in order to protect itself ?
10
votes
3answers
696 views

Are there valid reasons for spoofing an address?

This is a corollary to the question Why don't ISPs filter on source address to prevent spoofing?. Are there valid reasons to spoof an address?