SB2024072522 - Multiple vulnerabilities in SEV-SNP firmware on AMD processors

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Main Vulnerability Database SB2024072522

SB2024072522 - Multiple vulnerabilities in SEV-SNP firmware on AMD processors

Published: July 25, 2024

Security Bulletin ID SB2024072522
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 2
Exploitation vector Local access
Highest impact Information disclosure

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 2 vulnerabilities.


1) Improper Initialization (CVE-ID: CVE-2023-31346)

CWE-ID: CWE-665 - Improper Initialization

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a local user to gain access to sensitive information.

The vulnerability exists due to improper initialization in SEV Firmware. A local user can run a specially crafted application to access stale data from other guests.


2) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2023-31347)

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a local user to modify data on other guests.

The vulnerability exists due to improper privilege management in Secure_TSC, SEV firmware. A local user can cause a guest to observe an incorrect TSC when Secure TSC is enabled potentially resulting in a loss of guest integrity.


Remediation

Install update from vendor's website.

References