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Message-ID: <20250313035536.GA20899@openwall.com>
Date: Thu, 13 Mar 2025 04:55:36 +0100
From: Solar Designer <solar@...nwall.com>
To: Andrew Cooper <andrew.cooper3@...rix.com>
Cc: oss-security@...ts.openwall.com
Subject: Re: Xen Security Notice 2 (CVE-2024-35347) AMD CPU Microcode Signature Verification Vulnerability

On Sat, Mar 08, 2025 at 01:28:07AM +0000, Andrew Cooper wrote:
> On 06/03/2025 4:48 am, Solar Designer wrote:
> > On Thu, Mar 06, 2025 at 04:11:25AM +0000, Andrew Cooper wrote:
> >> This issue wins points for spite, because the highest risk users are the
> >> ones who were taking proactive steps to try and improve their security,
> >> betting that AMD's patchloader crypto was sound.
> > OK, so this is to protect legitimate sysadmins from loading malicious
> > microcode inadvertently or via a supply chain attack.  Makes sense.
> 
> Sorry for the delay, I knew there was a distro formally doing this, but
> I'd lost track of the links.
> 
> https://github.com/divestedcg/real-ucode which is packaged for Arch as
> https://aur.archlinux.org/packages/amd-real-ucode-git (and an equivalent
> Intel package).

Thank you for these followup postings, Andrew!  They're very helpful.

I have one late nitpick to add - as jericho @attritionorg pointed out on
Twitter, the Subject line here gives an incorrect CVE number.  The
correct one is CVE-2024-36347.

Alexander

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