Amazon Linux AMI update for kernel

Published: 2024-06-25

Risk	Low
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2021-47110 CVE-2023-30456
CWE-ID	CWE-119 CWE-20
Exploitation vector	Local
Public exploit	N/A
Vulnerable software	Amazon Linux AMI Operating systems & Components / Operating system kernel Operating systems & Components / Operating system package or component
Vendor	Amazon Web Services

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Buffer overflow

EUVDB-ID: #VU91208

Risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-47110

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to memory corruption within the kvm_crash_shutdown() and kvmclock_init() functions in arch/x86/kernel/kvmclock.c, within the kvm_guest_cpu_offline() function in arch/x86/kernel/kvm.c. A local user can escalate privileges on the system.

Mitigation

Update the affected packages:

i686:
    kernel-4.14.348-187.562.amzn1.i686
    perf-4.14.348-187.562.amzn1.i686
    kernel-tools-debuginfo-4.14.348-187.562.amzn1.i686
    kernel-debuginfo-common-i686-4.14.348-187.562.amzn1.i686
    kernel-tools-devel-4.14.348-187.562.amzn1.i686
    kernel-debuginfo-4.14.348-187.562.amzn1.i686
    kernel-headers-4.14.348-187.562.amzn1.i686
    kernel-devel-4.14.348-187.562.amzn1.i686
    perf-debuginfo-4.14.348-187.562.amzn1.i686
    kernel-tools-4.14.348-187.562.amzn1.i686

src:
    kernel-4.14.348-187.562.amzn1.src

x86_64:
    kernel-headers-4.14.348-187.562.amzn1.x86_64
    perf-4.14.348-187.562.amzn1.x86_64
    kernel-4.14.348-187.562.amzn1.x86_64
    kernel-debuginfo-4.14.348-187.562.amzn1.x86_64
    perf-debuginfo-4.14.348-187.562.amzn1.x86_64
    kernel-devel-4.14.348-187.562.amzn1.x86_64
    kernel-tools-devel-4.14.348-187.562.amzn1.x86_64
    kernel-debuginfo-common-x86_64-4.14.348-187.562.amzn1.x86_64
    kernel-tools-4.14.348-187.562.amzn1.x86_64
    kernel-tools-debuginfo-4.14.348-187.562.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

kernel: before 4.14.348-187.562

CPE2.3

External links

http://alas.aws.amazon.com/ALAS-2024-1942.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) Input validation error

EUVDB-ID: #VU75456