Zombieload Intel side-channel attack detailed - CPU

New security flaw in Intel chips could affect millions

Intel past year disclosed that hackers could potentially read sensitive data on its processors, which power most data centers and personal computers, by exploiting a feature called speculative execution, in which the chip tries to guess which computations it will carry out ahead of time in an effort to speed up the chip. ZombieLoad affects every Intel processor made since 2011, which means all MacBooks and a large majority of Windows PCs are in the crosshairs.

A "zombie load" is a high amount of data that the processor can not properly handle, which causes the processor to use elements of its microcode to prevent the whole PC crashing. Most programs normally only have access to their own data, but with Zombieload, a malicious program could exploit the CPU to gain access to information held by other programs running on the machine.

It has been just over a year since CPU vulnerabilities like Spectre and Meltdown last dominated the news cycle. In a statement to Wired, a Microsoft spokesperson said, "We're aware of this industry-wide issue and have been working closely with affected chip manufacturers to develop and test mitigations to protect our customers". The official reference number for Zombieload is CVE-2019-12130 and the latest Intel microcode update puts protections in place to mitigate the issue.

There will also be a security update for Macs running macOS Sierra and macOS High Sierra as well. iPhones and iPads are not affected.

KitGuru Says: The unveiling of Zombieload/MDS comes at an unfortunate time, as Computex is right around the corner and Intel is due to release new CPUs very soon.

Chromebooks and Chrome OS devices will have already had the ZombieLoad patches applied.

Of course, hackers need to have some way to run code on a targeted machine before the MDS vulnerabilities can be exploited so their severity might not be relevant to people who keep their PC under lock and key.

Fixing these flaws is also problematic as it requires patching processors in ways that may slow them down. Meltdown and Spectre ended up causing a lot of disruption - and badly damaged Intel's reputation.



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