Amazon Linux AMI update for microcode_ctl

Published: 2024-08-06

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2023-38575 CVE-2023-39368
CWE-ID	CWE-200 CWE-693
Exploitation vector	Network
Public exploit	N/A
Vulnerable software	Amazon Linux AMI Operating systems & Components / Operating system microcode_ctl Operating systems & Components / Operating system package or component
Vendor	Amazon Web Services

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Information disclosure

EUVDB-ID: #VU87490

Risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2023-38575

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

Exploit availability: No

Description

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

The vulnerability exists due to non-transparent sharing of return predictor targets between contexts in some Intel Processors. A local user can gain unauthorized access to sensitive information on the system.

Mitigation

Update the affected packages:

src:
    microcode_ctl-2.1-53.amzn2023.0.5.src

x86_64:
    microcode_ctl-2.1-53.amzn2023.0.5.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

microcode_ctl: All versions

CPE2.3

External links

https://alas.aws.amazon.com/AL2023/ALAS-2024-559.html

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) Protection Mechanism Failure

EUVDB-ID: #VU87495

Risk: Medium

CVSSv4.0: 4.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2023-39368

CWE-ID: CWE-693 - Protection Mechanism Failure