Archive for June 2016

Teardrop Attack : What Is It And How Does It Work?

Teardrop attack is a type of Denial of Service (DoS) attack which exploits the fragment offset field in the IP header to produce buggy fragments which are then delivered to the target machine. Unable to rearrange the fragments, the victim keeps on accumulating the fragments until it crashes.

As the name suggests, the Teardrop Attack works gradually by sending the fragmented packets to a target machine. It’s a type of a denial-of-service (DoS) attack which overwhelms the target machine with the incomplete data so that the victim crashes down.

In Teardrop Attack, fragmented packets that are sent in the to the target machine, are buggy in nature and the victim’s machine is unable to reassemble those packets due to the bug in the TCP/IP fragmentation.

In this way, the packets keep on getting accumulated over the victim’s machine and finally due to the buffer overflow, the target machine crashes down.
How Teardrop Attack works?
Here, I am taking a reference from the Juniper’s technical publication to illustrate how does it work —

As you can see in the above figure of IP header, which operates at the network layer, there is a field called fragment offset field.

Teardrop Attack and Fragment Offset:

Understand it like this — When a large amount of data is sent across the internet, the data is broken into the smaller fragments. Each of these fragments is assigned a number. When they reach the receiving end, these fragments are rearranged to reproduce the original data or message.
To identify the sequencing of the fragments, the fragment offset field holds the necessary information using which the target machine rearranges the sequence.
However, in the Teardrop Attack, the fragment offset field is made buggy by the hacker so the victim’s machine is unable to find the relative fragments.
So, as the name suggests, the buggy packets keep on accumulating at the victim’s side like teardrops and ultimately it leads to the machine crash.
However, modern networking devices can detect this discrepancy in a fragmented packet. Once they detect the problem, they simply drop the packet.

For More Details Contact :   
Redback IT Academy
#AL 24 , TNHB Phase III,
Contact : +91 8189985559
Tuesday, 28 June 2016
Posted by Siva Priya

Top 10 Common Hacking Techniques You Should Know About

Using simple hacks, a hacker can know about your personal unauthorized information which you might not want to reveal. Knowing about these common hacking techniques like phishing, DDoS, clickjacking etc. could come handy for your personal safety.

Unethical hacking can be called an illegal activity to get unauthorized information by modifying a system’s features and exploiting its loopholes. In this world where most of the things happen online, hacking provides wider opportunities for the hackers to gain unauthorized access to the unclassified information like credit card details, email account details, and other personal information.

So, it is also important to know some of the hacking techniques that are commonly used to get your personal information in an unauthorized way.

1. Keylogger
Keylogger is a simple software that records the key sequence and strokes of your keyboard into a log file on your machine. These log files might even contain your personal email IDs and passwords.

Keylogger is one of the main reasons why online banking sites give you an option to use their virtual keyboards.

2. Denial of Service (DoS\DDoS)
A Denial of Service attack is a hacking technique to take down a site or server by flooding that site or server with a lot of traffic that the server is unable to process all the requests in the real time and finally crashes down.

For DDoS attacks, hackers often deploy botnets or zombie computers which have got the only work to flood your system with request packets.

3. Waterhole attacks
If you are a big fan of Discovery or National Geographic channels, you could relate easily with the waterhole attacks. To poison a place, in this case, the hacker hits the most accessible physical point of the victim.

For example, if the source of a river is poisoned, it will hit the entire stretch of animals during summer. In the same way, hackers target the most accessed physical location to attack the victim. That point could be a coffee shop, a cafeteria etc.

Once hackers are aware of your timings, they might create a fake Wi-Fi access point and modify your most visited website to redirect them to you to get your personal information.

4. Fake WAP
Even just for fun, a hacker can use software to fake a wireless access point. This WAP connects to the official public place WAP. Once you get connected the fake WAP, a hacker can access your data, just like in the above case.

5. Eavesdropping (Passive Attacks)
Unlike other attacks which are active in nature, using a passive attack, a hacker just monitors the computer systems and networks to gain some unwanted information.

The motive behind eavesdropping is not to harm the system but to get some information without being identified.

6. Phishing
Phishing is a hacking technique using which a hacker replicates the most-accessed sites and traps the victim by sending that spoofed link.

Once the victim tries to login or enter some data, the hacker gets that private information of the target victim using the trojan running on the fake site.

7. Virus, Trojan etc.
Virus or trojans are malicious software programs which get installed into the victim’s system and keeps sending the victims data to the hacker.

8. ClickJacking Attacks
ClickJacking is also known by a different name, UI Redress. In this attack, the hacker hides the actual UI where the victim is supposed to click.

In another word, the attacker hijacks the clicks of the victim that aren’t meant for the exact page, but for a page where the hacker wants you to be.

9. Cookie theft
The cookies of a browser keep our personal data such as browsing history, username, and passwords for different sites that we access. Once the hacker gets the access to your cookie, he can even authenticate himself as you on a browser.

10. Bait and switch
Using bait and switch hacking technique, the hacker runs a malicious program which the user believes to be authentic. This way, after installing the malicious program on your computer, the hacker gets unprivileged access to your computer.

To Learn Hacking :
Contact us : Redback IT Solutions Private Limited
                      #AL – 24 TNHB Phase III,
Call us : +91 8189985551

Mail us : 
Tuesday, 7 June 2016
Posted by Siva Priya

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