Using Hackability to uncover a Chrome infoleak
Summary: PortSwigger researcher Gareth Heyes found a cross-domain information leak in Chrome by setting an iframe's location to about:blank and reading the baseURI property of the cross-domain window, exposing full URLs including hash and query string parameters. Google traced the underlying baseURI bug to 2017, patched it on 8 July 2022, and awarded a $2000 bounty, with Chrome releasing the fix on 30 August 2022.
What you should know: The leak let one subdomain read the full URL of another, so a frameable page on attachments.example.com could have captured OAuth tokens from oauth.example.com - a five-year-old property bug that only became a security issue once someone chained it with an existing technique.
Read the original at PortSwigger Research ↗
- Topics
- Vulnerabilities & Patching
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