Apple Security Advisory 2018-1-8-3 - Safari 11.0.2 is now available and and addresses security issues relating to Spectre.
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Apple Security Advisory 2018-1-8-2 - macOS High Sierra 10.13.2 Supplemental Update includes security improvements to Safari and WebKit to mitigate the effects of Spectre.
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Apple Security Advisory 2018-1-8-1 - iOS 11.2.2 is now available and and addresses Spectre issues with Safari and WebKit.
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This is a note from the FreeBSD team that they were notified of the issue in late December and received a briefing under NDA with the original embargo date of January 9th. Since they received relatively late notice of the issue, their ability to provide fixes is delayed.
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Ubuntu Security Notice 3516-1 - It was discovered that speculative execution performed by modern CPUs could leak information through a timing side-channel attack, and that this could be exploited in web browser JavaScript engines. If a user were tricked in to opening a specially crafted website, an attacker could potentially exploit this to obtain sensitive information from other domains, bypassing same-origin restrictions.
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Whitepaper called Spectre Attacks: Exploiting Speculative Execution. It discusses how to trick error-free applications into giving up secret information.
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Spectre information disclosure proof of concept exploit that affects multiple CPUs.
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This is the very thorough blog write-up discussing three variants of side-channel attacks that can be leveraged against CPU data cache timing.
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