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Old 03-28-2018, 01:31 PM   #1
SRTDodge05
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Windows 7 Suffers ‘Total Meltdown’

As if the Meltdown and Spectre CPU flaws weren’t bad enough on their own, Microsoft was somehow able to make the flaw even worse on Windows 7. According to Swedish security researcher Ulf Frisk, the fix that Microsoft provided to Windows 7 computers for the Meltdown flaw, which could allow attackers to read kernel memory at a speed of 120 KB/s, would now allow attackers to read the same kernel memory with a speed of gigabytes per second.

“Total Meltdown”
Frisk called the new vulnerability, which Microsoft introduced on Windows 7 machines while trying to fix the Meltdown flaw, “Total Meltdown.” The new bug allows any process to read the complete memory contents of the system, and it also makes it possible to write code to arbitrary memory, too.

According to Frisk, no special attack or technique was needed. All he had to do was take advantage of Windows 7’s mapping of memory contents that belong to running processes.

The main issue and mistake made by Microsoft is that the company set the PML4 page table permission bit to User instead of the kernel Supervisor. This made it so the memory that would normally be assigned to the kernel be assigned to every process, including those running with user-level privileges. The PML4 is the base of the 4-level in-memory page table hierarchy that the CPU Memory Management Unit (MMU) uses to translate the virtual addresses of a process into physical memory addresses in RAM.

Windows 7 Suffers ‘Total Meltdown’ Thanks To Microsoft’s Meltdown Patch
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Old 03-28-2018, 01:39 PM   #2
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Re: Windows 7 Suffers ‘Total Meltdown’

Well it just keep getting better?
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Old 03-28-2018, 02:47 PM   #3
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Re: Windows 7 Suffers ‘Total Meltdown’

Think I'll wait until the 10th gen comes out before I upgrade my main pc. 4th gen still kicking butt.
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Old 03-28-2018, 04:32 PM   #4
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Re: Windows 7 Suffers ‘Total Meltdown’

You know Intel should at least give back to the guys who just bought the latest, mine is only like 3 months old, same for Sandog and Skully! Oh well....
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Old 03-28-2018, 05:22 PM   #5
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Re: Windows 7 Suffers ‘Total Meltdown’

Atleast offer some Intel T-shirts and hats
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Old 03-28-2018, 05:38 PM   #6
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Re: Windows 7 Suffers ‘Total Meltdown’

Or a 900p ssd
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Old 03-28-2018, 10:43 PM   #7
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Re: Windows 7 Suffers ‘Total Meltdown’

Might be pushing it.
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