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New Spectre-like attack uses speculative execution to overflow buffers

July 11, 2018

When the Spectre and Meltdown attacks were disclosed earlier this year, the expectation was that these attacks would be the first of many, as researchers took a closer look at the way that the speculative execution in modern processors could be used to leak sensitive information and undermine the security of software running on those processors. In May, we saw the speculative store bypass, and today we have a new variant on this theme: speculative buffer overflows, discovered by Vladimir Kiriansky at MIT and independent researcher Carl Waldspurger.

All the attacks follow a common set of principles. Each processor has an architectural behavior (the documented behavior that describes how the instructions work and that programmers depend on to write their programs) and a microarchitectural behavior (the way an actual implementation of the architecture behaves).

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