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Zip Bomb

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Posted: Mon May 02, 2011 12:18

Author:

LionKiller

From Wikipedia, the free encyclopedia

A zip bomb, also known as a Zip of Death or decompression bomb, is a malicious archive file designed to crash or render useless the program or system reading it. It is often employed to disable antivirus software, so that a more traditional virus sent afterwards could get through undetected.
Rather than hijacking the normal operation of the program, a zip bomb allows the program to work as intended, but the archive is carefully crafted so that unpacking it (e.g. by a virus scanner in order to scan for viruses) requires inordinate amounts of time, disk space or memory.
A zip bomb is usually a small file (up to a few hundred kilobytes) for ease of transport and to avoid suspicion. However, when the file is unpacked its contents are more than the system can handle.
The technique has been used on dialup bulletin board systems at least as long as compressing data archive programs have been around.[citation needed]
Today, most antivirus programs can detect whether a file is a zip bomb and so avoid unpacking it.[1]
One example of a Zip bomb was the file "42.zip" which was 42 kilobytes of compressed data, containing five layers of nested zip files in sets of 16, each bottom layer archive containing a 4.3 gigabyte (4 294 967 295 bytes; ~ 3.99 GiB) file for a total of 4.5 petabytes (4 503 599 626 321 920 bytes; ~ 3.99 PiB) of uncompressed data. [2] This file is still available for download on various websites across the internet.

The file contains 16 zipped files, which again contains 16 zipped files, which again contains 16 zipped files, which again contains 16 zipped, which again contains 16 zipped files, which contain 1 file, with the size of 4.3GB.

So, if you extract all files, you will most likely run out of space :-)

16 x 4294967295 = 68.719.476.720 (68GB)
16 x 68719476720 = 1.099.511.627.520 (1TB)
16 x 1099511627520 = 17.592.186.040.320 (17TB)
16 x 17592186040320 = 281.474.976.645.120 (281TB)
16 x 281474976645120 = 4.503.599.626.321.920 (4,5PB)

Posted: Mon May 02, 2011 22:21

Author:

MagiKHanD

A good to know post.Thanks for share matey.

Posted: Tue May 03, 2011 00:53

Author:

Big_A_Little_A

thanks for the info much appreciated,

just incase anyone want to try it I have uploaded one here on ET

http://extratorrent.cc/torrent/4259/Zip+Bomb+RAR+file+%7BBig_A_Little_A%7D+%7BSamurai+RG%7D.html

Posted: Tue May 03, 2011 05:04

Author:

LionKiller

Big_A_Little_A wrote:

hehe excellent work sir ..

Posted: Tue May 03, 2011 09:07

Author:

MagiKHanD

Big_A_Little_A wrote:

lmfao.Nice one.