SB2021081049 - Information disclosure in AMD Secure Encryption Virtualization (SEV)

CSH
CYBERSECURITY HELP
Sign In REGISTER

Main Vulnerability Database SB2021081049

SB2021081049 - Information disclosure in AMD Secure Encryption Virtualization (SEV)

Published: August 10, 2021 Updated: July 12, 2022

Security Bulletin ID SB2021081049
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Information disclosure

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Information disclosure (CVE-ID: CVE-2020-12966)

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

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


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

The vulnerability exists due to a Ciphertext side channel attack on ECC and DH operations in the Secure Encrypted Virtualization with Encrypted State (SEV-ES) and Secure Encrypted Virtualization with Secure Nested Paging (SEV-SNP). A local user with control over hypervisor can obtain sensitive data from the guest OS.


Remediation

Install update from vendor's website.

References