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Amazon Linux 2 : microvm-kernel (ALASMICROVM-KERNEL-4.14-2023-002)
high Nessus Plugin ID 182061
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Synopsis
The remote Amazon Linux 2 host is missing a security update.Description
The version of microvm-kernel installed on the remote host is prior to 4.14.246-199.474. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2MICROVM-KERNEL-4.14-2023-002 advisory.A flaw was found in the Linux kernel's implementation of wireless drivers using the Atheros chipsets. An attacker within wireless range could send crafted traffic leading to information disclosure.
(CVE-2020-3702)
A flaw was found in the KVM's AMD code for supporting SVM nested virtualization. The flaw occurs when processing the VMCB (virtual machine control block) provided by the L1 guest to spawn/handle a nested guest (L2). Due to improper validation of the int_ctl field, this issue could allow a malicious L1 to enable AVIC support (Advanced Virtual Interrupt Controller) for the L2 guest. As a result, the L2 guest would be allowed to read/write physical pages of the host, resulting in a crash of the entire system, leak of sensitive data or potential guest-to-host escape. (CVE-2021-3653)
A flaw was found in the KVM's AMD code for supporting SVM nested virtualization. The flaw occurs when processing the VMCB (virtual machine control block) provided by the L1 guest to spawn/handle a nested guest (L2). Due to improper validation of the virt_ext field, this issue could allow a malicious L1 to disable both VMLOAD/VMSAVE intercepts and VLS (Virtual VMLOAD/VMSAVE) for the L2 guest. As a result, the L2 guest would be allowed to read/write physical pages of the host, resulting in a crash of the entire system, leak of sensitive data or potential guest-to-host escape. (CVE-2021-3656)
A flaw was found in the Linux kernel's OverlayFS subsystem in the way the user mounts the TmpFS filesystem with OverlayFS. This flaw allows a local user to gain access to hidden files that should not be accessible. (CVE-2021-3732)
A race problem was seen in the vt_k_ioctl in drivers/tty/vt/vt_ioctl.c in the Linux kernel, which may cause an out of bounds read in vt as the write access to vc_mode is not protected by lock-in vt_ioctl (KDSETMDE). The highest threat from this vulnerability is to data confidentiality. (CVE-2021-3753)
A flaw was found in the Linux kernel, where it incorrectly computes the access permissions of a shadow page. This issue leads to a missing guest protection page fault. (CVE-2021-38198)
A flaw was found in the Linux kernel that allows attackers to defeat an ASLR protection mechanism because it prints a kernel pointer (i.e., the real IOMEM pointer). The highest threat from this vulnerability is to confidentiality. (CVE-2021-38205)
Tenable has extracted the preceding description block directly from the tested product security advisory.
Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.
Solution
Run 'yum update microvm-kernel' to update your system.See Also
https://alas.aws.amazon.com/AL2/ALASMICROVM-KERNEL-4.14-2023-002.html
https://alas.aws.amazon.com/cve/html/CVE-2020-3702.html
https://alas.aws.amazon.com/cve/html/CVE-2021-3653.html
https://alas.aws.amazon.com/cve/html/CVE-2021-3656.html
https://alas.aws.amazon.com/cve/html/CVE-2021-3732.html
https://alas.aws.amazon.com/cve/html/CVE-2021-3753.html
https://alas.aws.amazon.com/cve/html/CVE-2021-38198.html
Plugin Details
Severity: High
ID: 182061
File Name: al2_ALASMICROVM-KERNEL-4_14-2023-002.nasl
Version: 1.2
Type: local
Agent: unix
Published: 9/27/2023
Updated: 12/11/2024
Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Nessus Agent, Nessus
Risk Information
VPR
Risk Factor: High
Score: 7.3
CVSS v2
Risk Factor: High
Base Score: 7.2
Temporal Score: 5.6
Vector: CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C
CVSS Score Source: CVE-2021-3656
CVSS v3
Risk Factor: High
Base Score: 8.8
Temporal Score: 7.9
Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C
Vulnerability Information
CPE: p-cpe:/a:amazon:linux:microvm-kernel-debuginfo-common-x86_64, p-cpe:/a:amazon:linux:microvm-kernel-headers, p-cpe:/a:amazon:linux:microvm-kernel-debuginfo, p-cpe:/a:amazon:linux:microvm-kernel, p-cpe:/a:amazon:linux:microvm-kernel-debuginfo-common-aarch64, cpe:/o:amazon:linux:2, p-cpe:/a:amazon:linux:microvm-kernel-devel
Required KB Items: Host/local_checks_enabled, Host/AmazonLinux/release, Host/AmazonLinux/rpm-list
Exploit Available: true
Exploit Ease: Exploits are available
Patch Publication Date: 9/14/2023
Vulnerability Publication Date: 9/8/2020
Reference Information
CVE: CVE-2020-3702, CVE-2021-3653, CVE-2021-3656, CVE-2021-3732, CVE-2021-3753, CVE-2021-38198, CVE-2021-38205