SB2021101403 - Multiple vulnerabilities in AMD CPUs

Description

This security bulletin contains information about 2 secuirty vulnerabilities.

1) Information disclosure (CVE-ID: CVE-2020-12965)

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

The vulnerability exists due to CPUs transiently execute non-canonical loads using only the lower 48 address bits. A local attacker can gain unauthorized access to sensitive information on the system.

2) Information disclosure (CVE-ID: CVE-2021-26318)

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

The vulnerability exists due to a timing and power-based side channel attack. A local attacker can leverage the x86 PREFETCH instructions and obtain kernel address space information.

Remediation

Cybersecurity Help is not aware of any official remediation provided by the vendor.

References

• https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1010
• https://www.amd.com/system/files/documents/security-whitepaper.pdf
• https://developer.amd.com/wp-content/resources/90343-D_SoftwareTechniquesforManagingSpeculation_WP_9-20Update_R2.pdf
• https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1017