About speculative execution vulnerabilities in ARM-based and Intel CPUs Security researchers have recently uncovered security issues known by two names, Meltdown and Spectre. These issues apply to all modern processors and affect nearly all computing devices and operating systems. All Mac systems and iOS devices are affected, but there are no known exploits impacting customers at this time. Since exploiting many of these issues requires a malicious app to be loaded on your Mac or iOS device, we recommend downloading software only from trusted sources such as the App Store. Apple has already released mitigations in iOS 11.2, macOS 10.13.2, and tvOS 11.2 to help defend against Meltdown. Apple Watch is not affected by Meltdown. In the coming days we plan to release mitigations in Safari to help defend against Spectre. We continue to develop and test further mitigations for these issues and will release them in upcoming updates of iOS, macOS, tvOS, and watchOS.BackgroundThe Meltdown and Spectre issues take advantage of a modern CPU performance feature called speculative execution. Speculative execution improves speed by operating on multiple instructions at once-possibly in a different order than when they entered the CPU. To increase performance, the CPU predicts which path of a branch is most likely to be taken, and will speculatively continue execution down that path even before the branch is completed. If the prediction was wrong, this speculative execution is rolled back in a way that is intended to be invisible to software.The Meltdown and Spectre exploitation techniques abuse speculative execution to access privileged memory-including that of the kernel-from a less-privileged user process such as a malicious app running on a device.MeltdownMeltdown is a name given to an exploitation technique known as CVE-2017-5754 or "rogue data cache load." The Meltdown technique can enable a user process to read kernel memory. Our analysis suggests that it has the most potential to be exploited. Apple released mitigations for Meltdown in iOS 11.2, macOS 10.13.2, and tvOS 11.2. watchOS did not require mitigation. Our testing with public benchmarks has shown that the changes in the December 2017 updates resulted in no measurable reduction in the performance of macOS and iOS as measured by the GeekBench 4 benchmark, or in common Web browsing benchmarks such as Speedometer, JetStream, and ARES-6.SpectreSpectre is a name covering two different exploitation techniques known as CVE-2017-5753 or "bounds check bypass," and CVE-2017-5715 or "branch target injection." These techniques potentially make items in kernel memory available to user processes by taking advantage of a delay in the time it may take the CPU to check the validity of a memory access call.Analysis of these techniques revealed that while they are extremely difficult to exploit, even by an app running locally on a Mac or iOS device, they can be potentially exploited in JavaScript running in a web browser. Apple will release an update for Safari on macOS and iOS in the coming days to mitigate these exploit techniques. Our current testing indicates that the upcoming Safari mitigations will have no measurable impact on the Speedometer and ARES-6 tests and an impact of less than 2.5% on the JetStream benchmark. We continue to develop and test further mitigations within the operating system for the Spectre techniques, and will release them in upcoming updates of iOS, macOS, tvOS, and watchOS.
KernelAvailable for: macOS High Sierra 10.13.1, macOS Sierra 10.12.6, OS X El Capitan 10.11.6Impact: An application may be able to read kernel memoryDescription: Systems with microprocessors utilizing speculative execution and indirect branch prediction may allow unauthorized disclosure of information to an attacker with local user access via a side-channel analysis of the data cache.CVE-2017-5754: Jann Horn of Google Project Zero, Werner Haas and Thomas Prescher of Cyberus Technology GmbH, and Daniel Gruss, Moritz Lipp, Stefan Mangard and Michael Schwarz from Graz University of TechnologyEntry added January 4, 2018
bacon om 11:23, 05-01-2018"De komende dagen zal er een update uitkomen voor Safari om ons te beschermen tegen Spectre.
Refresh that support document again. Apple updated it again today to remove the references to 10.11 and 10.12 updates covering CVE-2017-5754. This was a change from what they posted yesterday.
So.... One individual in Internet pieced together and inadvertently exposed this massive problem on their day off because they were bored that day. A problem that The Industry had on super-silent lockdown for months. There are state sponsored groups whose _only job_ is to look for this kind of stuff. I know the talking point has been "there are no known exploits"... but still. Am I being alarmist? Has no one really heard anything different? I don't dabble in the "dark web", but it seems incredible to me that there really isn't an active exploit out there already
this was pieced together by reversing linux kernel patches committed without comments and connecting the dots, so it's not that the guy figured it out blindly
Als je het nieuwsitem daadwerkelijk leest, inclusief het citaat van Apple, zie je wat Apple ondertussen deed..
Gast
