Monsters in the Middleboxes: Introducing Two New Tools for Detecting HTTPS Interception
Mar 18, 2019Gabbi Fisher, Luke Valenta
Summary
This post introduces MITMEngine, an open-source Golang library for detecting HTTPS interception by analyzing TLS Client Hello messages and comparing them against known browser signatures. It also introduces MALCOLM, a dashboard that displays metrics about observed HTTPS interception on Cloudflare's network. The post details the mechanics of HTTPS interception, including TLS-terminating forward proxies, antivirus/corporate proxies, malware proxies, and reverse proxies, and explains the security implications of interception.
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