Multiple vulnerabilities in AMD CPUs



Published: 2021-10-14
Risk Low
Patch available NO
Number of vulnerabilities 2
CVE-ID CVE-2020-12965
CVE-2021-26318
CWE-ID CWE-200
Exploitation vector Local
Public exploit N/A
Vulnerable software
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AMD CPU Firmware
Hardware solutions / Firmware

Vendor AMD

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Information disclosure

EUVDB-ID: #VU57349

Risk: Low

CVSSv3.1: 5.7 [CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:U/RC:C]

CVE-ID: CVE-2020-12965

CWE-ID: CWE-200 - Information Exposure

Exploit availability: No

Description

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.

Mitigation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

AMD CPU Firmware: All versions

CPE2.3 External links

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

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Information disclosure

EUVDB-ID: #VU57350

Risk: Low

CVSSv3.1: 5.7 [CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:U/RC:C]

CVE-ID: CVE-2021-26318

CWE-ID: CWE-200 - Information Exposure

Exploit availability: No

Description

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.

Mitigation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

AMD CPU Firmware: All versions

CPE2.3 External links

http://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1017

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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