Daily Edition · Page 5

THE DAILY INDEX

Technology, AI, software, security, crypto and business

ATTACKS & VULNERABILITIES

TLDR InfoSec

YET ANOTHER ZIP TRICK WRITEUP

This write-up explains how to create a "schizophrenic ZIP file". This type of ZIP file appears differently depending on the parser used. The trick relies on how parsers locate the Central Directory, with some using the offset field and others calculating it from the size. As a result, each method points to different Central Directories containing different file content, allowing the same ZIP file to display different contents depending on which parser opens it. This enables malicious files to be opened without the user's knowledge.

INSTAGRAM USES EXPIRING CERTIFICATES AS SINGLE DAY TLS CERTIFICATES

While testing a personal tool, the author of this post noticed that certificates for instagram.com had unusual expiration times. The author set up a machine that attempted to pull the certificates for instagram.com and www.instagram.com every 5 minutes. They discovered that Instagram uses certificates with a lifetime of 8 days, replaces them daily, and uses unique certificates for instagram.com and www.instagram.com.

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