Older AMD, Intel chips vulnerable to data-leaking 'Retbleed' Spectre variant
Older AMD and Intel chips are vulnerable to yet another Spectre-based speculative-execution attack that exposes secrets within kernel memory despite defenses already in place. Mitigating this side channel is expected to take a toll on performance.
, if malware really wants to steal data, there are usually plenty of vulnerabilities in OSes and applications to do just that, or ways of socially engineering the user, without having to manipulate the host processor., maybe one day someone will exploit it in the wild in a meaningful way. Also, if you're running virtual machines in a public cloud, you may want to be aware of this security weakness as information about or in your VM could leak to another customer via Retbleed.
Retbleed is the result of research into the way a processor's branch predictor unit behaves with indirect branches. What Wikner and Razavi found, as explained in their[PDF], Retbleed: Arbitrary Speculative Code Execution with Return Instructions, is that"all return instructions that follow sufficiently deep call stacks can be hijacked using a precise branch history on Intel CPUs."
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