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July 07 2019

nicapicella
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July 06 2019

nicapicella
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GADEEEEEEEEEEM ;on a sidenote, read recently Rasputin was using eye hipnosis to fuck around
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nicapicella
18:40

A better zip bomb


Summary:
This article shows how to construct a non-recursive zip bomb that achieves a high compression ratio by overlapping files inside the zip container. "Non-recursive" means that it does not rely on a decompressor's recursively unpacking zip files nested within zip files: it expands fully after a single round of decompression. The output size increases quadratically in the input size, reaching a compression ratio of over 28 million (10 MB → 281 TB) at the limits of the zip format. Even greater expansion is possible using 64-bit extensions. The construction uses only the most common compression algorithm, DEFLATE, and is compatible with most zip parsers.
zbsm.zip 42 kB → 5.5 GB zblg.zip 10 MB → 281 TB zbxl.zip 46 MB → 4.5 PB (Zip64, less compatible)

Source code: git clone https://www.bamsoftware.com/git/zipbomb.git zipbomb-20190702.zip Data and source for figures: git clone https://www.bamsoftware.com/git/zipbomb-paper.git

https://www.bamsoftware.com/hacks/zipbomb/
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