Amazon Linux 2 : kernel (ALAS-2021-1727)

high Nessus Plugin ID 155973

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Synopsis

The remote Amazon Linux 2 host is missing a security update.

Description

The version of kernel installed on the remote host is prior to 4.14.256-197.484. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2021-1727 advisory.

2024-08-14: CVE-2021-47203 was added to this advisory.

2024-08-14: CVE-2021-47184 was added to this advisory.

2024-08-14: CVE-2021-47189 was added to this advisory.

2024-08-14: CVE-2021-47185 was added to this advisory.

2024-04-30: CVE-2023-0047 was removed from this advisory (rejected).

2024-02-01: CVE-2023-0047 was added to this advisory.

A flaw use-after-free in function sco_sock_sendmsg() of the Linux kernel HCI subsystem was found in the way user calls ioct UFFDIO_REGISTER or other way triggers race condition of the call sco_conn_del() together with the call sco_sock_sendmsg() with the expected controllable faulting memory page. A privileged local user could use this flaw to crash the system or escalate their privileges on the system.
(CVE-2021-3640)

A flaw was found in the Linux SCTP stack. A blind attacker may be able to kill an existing SCTP association through invalid chunks if the attacker knows the IP-addresses and port numbers being used and the attacker can send packets with spoofed IP addresses. (CVE-2021-3772)

A memory leak flaw in the Linux kernel's hugetlbfs memory usage was found in the way the user maps some regions of memory twice using shmget() which are aligned to PUD alignment with the fault of some of the memory pages. A local user could use this flaw to get unauthorized access to some data. (CVE-2021-4002)

In the Linux kernel, the following vulnerability has been resolved:

i40e: Fix NULL ptr dereference on VSI filter sync (CVE-2021-47184)

In the Linux kernel, the following vulnerability has been resolved:

tty: tty_buffer: Fix the softlockup issue in flush_to_ldisc (CVE-2021-47185)

In the Linux kernel, the following vulnerability has been resolved:

btrfs: fix memory ordering between normal and ordered work functions (CVE-2021-47189)

In the Linux kernel, the following vulnerability has been resolved:

scsi: lpfc: Fix list_add() corruption in lpfc_drain_txq() (CVE-2021-47203)

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 kernel' to update your system.

Plugin Details

Severity: High

ID: 155973

File Name: al2_ALAS-2021-1727.nasl

Version: 1.12

Type: local

Agent: unix

Family: Amazon Linux Local Security Checks

Published: 12/10/2021

Updated: 12/11/2024

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: Medium

Base Score: 6.9

Temporal Score: 5.4

Vector: CVSS2#AV:L/AC:M/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2021-3640

CVSS v3

Risk Factor: High

Base Score: 7

Temporal Score: 6.3

Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/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:perf, p-cpe:/a:amazon:linux:perf-debuginfo, p-cpe:/a:amazon:linux:kernel-tools-debuginfo, p-cpe:/a:amazon:linux:kernel-debuginfo-common-aarch64, p-cpe:/a:amazon:linux:kernel-tools, p-cpe:/a:amazon:linux:kernel-devel, p-cpe:/a:amazon:linux:python-perf-debuginfo, p-cpe:/a:amazon:linux:kernel, p-cpe:/a:amazon:linux:kernel-debuginfo, p-cpe:/a:amazon:linux:kernel-headers, cpe:/o:amazon:linux:2, p-cpe:/a:amazon:linux:kernel-livepatch-4.14.256-197.484, p-cpe:/a:amazon:linux:kernel-tools-devel, p-cpe:/a:amazon:linux:kernel-debuginfo-common-x86_64, p-cpe:/a:amazon:linux:python-perf

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: 12/8/2021

Vulnerability Publication Date: 12/8/2021

Reference Information

CVE: CVE-2021-3640, CVE-2021-3772, CVE-2021-4002, CVE-2021-47184, CVE-2021-47185, CVE-2021-47189, CVE-2021-47203

ALAS: 2021-1727

Detections

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