Google Project Zero researcher Tavis Ormandy yesterday disclosed a series of 20-year-old flaws in Microsoft's CTF protocol that could allow unauthorized parties to take over applications that use said protocol.

According to Ormandy's blog post and technical analysis, the flaw is specifically found in the msctf subsystem, which is a component of the Text Services Framework that manages input methods, keyboard layouts, text processing and more.

In his analysis, Ormandy describes the CTF subsystem as a"vast and complex" environment, further noting in his blog post that the CTF protocol "allows applications to exchange input and read each other's content. However, there are a lot of protocol bugs that allow taking complete control of almost any other application."

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