Jeremiah Grossman: Another way to force-spoof browser referers.

Monday, July 24, 2006

Another way to force-spoof browser referers.

As a WhiteHat employee once said, "If JavaScript can't do it, ask daddy Flash". Amit Klein did a great job discovering and documenting a way to use Flash to force a user's browser to make arbitrary HTTP Requests to any location and spoof client-side headers (including Referer and Expect). This has many web application security implications which we'll need to discuss in the coming weeks.

"Forging HTTP request headers with Flash"

Bye Bye CSRF solution.

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BIO

Jeremiah Grossman brings 20+ years of experience in Computer Security and has become one of the most recognizable and world-renowned cybersecurity experts in the industry, coining several of the original hacking terms commonly used around the world today. Early in his career, Jeremiah was known as “The Hacker Yahoo” which led to his role as the company’s Information Security Officer. Jeremiah founded WhiteHat Security (now Synopsis), and served as Chief of Security Strategy for SentinelOne which was the highest-valued cybersecurity IPO in history. Most recently, Jeremiah was the founder & CEO of Bit Discovery, which was acquired by Tenable in 2022. He also serves as a company advisor and board member to several tech startups. In his spare time, Jeremiah does Brazilian Jiu-Jitsu and is passionate about classic cars. He recently opened Toybox, a luxury car club in Boise, Idaho.