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Today β€” 18 August 2022spaceraccoon.dev

You Have One New Appwntment: Exploiting iCalendar Properties in Enterprise Applications

18 August 2022 at 00:45
First defined in 1998, the iCalendar standard remains ubiquitous in enterprise software. However, it did not account for modern security concerns and allowed vendors to create proprietary extensions that expanded the format’s attack surface. I demonstrate how flawed RFC implementations led to vulnerabilities in popular enterprise applications. Attackers can trigger exploits remotely with zero user interaction due to automatic parsing of event invitations. Furthermore, I explain how iCalendar’s integrations with the SMTP and CalDAV protocols enable multi-stage attacks. Despite attempts to secure these technologies separately, the interactions that arise from features such as emailed event reminders require a β€œfull-stack” approach to calendar security. I conclude that developers should strengthen existing iCalendar standards in both design and implementation.
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