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Debian dla-4098 : amd64-microcode - security update

high Nessus Plugin ID 233550

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Synopsis

The remote Debian host is missing a security-related update.

Description

The remote Debian 11 host has a package installed that is affected by a vulnerability as referenced in the dla-4098 advisory.

 ------------------------------------------------------------------------- Debian LTS Advisory DLA-4098-1 [email protected] https://www.debian.org/lts/security/ Tobias Frost March 31, 2025 https://wiki.debian.org/LTS
 -------------------------------------------------------------------------

 Package : amd64-microcode Version : 3.20250311.1~deb11u1 CVE ID : CVE-2024-56161 Debian Bug : 1095470

 A potential vulnerability has been found for certain AMD platforms which creates a possible confidential computing vulnerability.

 AMD has released updated microcode to prevent an attacker from loading tampered microcode.

 Additionally an SEV firmware update might be required for some platforms to support SEV-SNP attestation, which may also necessitate a BIOS update.

 For details please see the AMD security bulletin AMD-SB-3019.

 CVE-2024-56161 (AMD-SB-3019):

 Improper signature verification in AMD CPU ROM microcode patch loader may allow an attacker with local administrator privileges to load malicious CPU microcode resulting in loss of confidentiality and integrity of a confidential guest running under AMD SEV-SNP.

 For Debian 11 bullseye, this problem has been fixed in version 3.20250311.1~deb11u1.

 We recommend that you upgrade your amd64-microcode packages.

 For the detailed security status of amd64-microcode please refer to its security tracker page at:
 https://security-tracker.debian.org/tracker/amd64-microcode

 Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS Attachment:
 signature.asc Description: PGP signature

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade the amd64-microcode packages.

See Also

http://www.nessus.org/u?75dfdaf9

https://security-tracker.debian.org/tracker/CVE-2024-56161

https://packages.debian.org/source/bullseye/amd64-microcode

Plugin Details

Severity: High

ID: 233550

File Name: debian_DLA-4098.nasl

Version: 1.1

Type: local

Agent: unix

Published: 3/31/2025

Updated: 3/31/2025

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.9

CVSS v2

Risk Factor: Medium

Base Score: 5.3

Temporal Score: 3.9

Vector: CVSS2#AV:L/AC:H/Au:M/C:C/I:C/A:N

CVSS Score Source: CVE-2024-56161

CVSS v3

Risk Factor: High

Base Score: 7.2

Temporal Score: 6.3

Vector: CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:debian:debian_linux:11.0, p-cpe:/a:debian:debian_linux:amd64-microcode

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Ease: No known exploits are available

Patch Publication Date: 3/31/2025

Vulnerability Publication Date: 2/3/2025

Reference Information

CVE: CVE-2024-56161