A Solution to Compression Oracles on the Web
Mar 27, 2018Guest Author
Summary
Developed and open-sourced cf-nocompress, a proof-of-concept NGINX plugin with a modified gzip module to mitigate compression oracle attacks (CRIME, BREACH, TIME, HEIST) by selectively compressing non-secret parts of web pages. The solution uses sregex to identify secrets via regular expressions and disables compression for them, preventing their inclusion in the compression dictionary. This approach aims to transparently protect sensitive information like CSRF tokens without requiring application modification or client-side JavaScript.
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