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Re: intel-microcode not fixing CVE-2018-3640, CVE-2018-3615 on Debian 10?

On 1/9/21 9:48 AM, Christoph Pflügler wrote:

On 08.01.21 23:40, Michael Stone wrote:
On Fri, Jan 08, 2021 at 10:48:30PM +0100, Christoph Pflügler wrote:
On 08.01.21 22:34, Michael Stone wrote:
On Fri, Jan 08, 2021 at 09:12:53PM +0100, Christoph Pflügler wrote:
Installing package intel-microcode in Debian 10 (Buster) mitigates most vulnerabilities as per spectre-meltdown-checker. However, CVE-2018-3640 and CVE-2018-3615 are still displayed as unmitigated after reboot, with spectre-meltdown-checker --explain (executed as su) pointing to missing microcode upgrades.

According to the Debian package description of intel-microcode, the two vulnerabilities are fixed in the current version of the package.

This occurs in exactly the same way on two different machines, one with an i5-3320M CPU and another one with an E3-1235L v5.

If I remember correctly, I was all green as per spectre-meltdown-checker in Debian 9 (Stretch).

What version of intel-microcode do you have installed?
intel-microcode:amd64/buster 3.20200616.1~deb10u1 uptodate, installed from Debian non-free repository

With an E3 v5, linux 4.19.0-13, and intel-microcode 3.20200616.1 the checker reports green for those checks on my test system. Do you have the latest spectre-meltdown-checker, and are you running it as root? If I run the current version as an unprivileged user those checks come up red (presumably because it can't read the cpu registers it is trying to read).

spectre-meltdown-checker:all/buster 0.42-1 uptodate, installed from Debian repository.

Yes, I executed it as root (su -> <passwd> -> spectre-meltdown-checker). I get exactly the same results running it as an unprivileged user. This is what spectre-meltdown-checker, run as root, shows for the two CVEs:

CVE-2018-3615 aka 'Foreshadow (SGX), L1 terminal fault'
* CPU microcode mitigates the vulnerability:  N/A
> STATUS:  VULNERABLE  (your CPU supports SGX and the microcode is not up to date)

CVE-2018-3640 aka 'Variant 3a, rogue system register read'
* CPU microcode mitigates the vulnerability:  NO
> STATUS:  VULNERABLE  (an up-to-date CPU microcode is needed to mitigate this vulnerability)

Linux version is also 4.19.0-13-amd64.

Both my instances are (almost) fresh installations (GNOME) based on recently released debian-10.7.0-amd64-netinst.iso.

I can confirm spectre-meltdown-checker reporting CVE-2018-3640 is not being mitigated by intel-microcode on a NUC6CAYS system, full-updated Bullseye/Sid. This is a Celeron system.

However, the same intel-microcode version on same OS does mitigate this vulnerability on NUC5i7RYH and NUC8i3BEH systems.

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