ZIPs tricks
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Command-line tools for managing zip files are essential for diagnosing, repairing, and cracking zip files. Here are some key utilities:
unzip
: Reveals why a zip file may not decompress.zipdetails -v
: Offers detailed analysis of zip file format fields.zipinfo
: Lists contents of a zip file without extracting them.zip -F input.zip --out output.zip
andzip -FF input.zip --out output.zip
: Try to repair corrupted zip files.fcrackzip: A tool for brute-force cracking of zip passwords, effective for passwords up to around 7 characters.
The Zip file format specification provides comprehensive details on the structure and standards of zip files.
It's crucial to note that password-protected zip files do not encrypt filenames or file sizes within, a security flaw not shared with RAR or 7z files which encrypt this information. Furthermore, zip files encrypted with the older ZipCrypto method are vulnerable to a plaintext attack if an unencrypted copy of a compressed file is available. This attack leverages the known content to crack the zip's password, a vulnerability detailed in HackThis's article and further explained in this academic paper. However, zip files secured with AES-256 encryption are immune to this plaintext attack, showcasing the importance of choosing secure encryption methods for sensitive data.
References
Learn & practice AWS Hacking:HackTricks Training AWS Red Team Expert (ARTE)
Learn & practice GCP Hacking:
HackTricks Training GCP Red Team Expert (GRTE)
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