Amazon Linux 2022 : (ALAS2022-2022-039)

high Nessus Plugin ID 164727

Synopsis

The remote Amazon Linux 2022 host is missing a security update.

Description

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2022-2022-039 advisory.

- Some AMD CPUs may transiently execute beyond unconditional direct branches, which may potentially result in data leakage. (CVE-2021-26341)

- LFENCE/JMP (mitigation V2-2) may not sufficiently mitigate CVE-2017-5715 on some AMD CPUs.
(CVE-2021-26401)

- Non-transparent sharing of branch predictor selectors between contexts in some Intel(R) Processors may allow an authorized user to potentially enable information disclosure via local access. (CVE-2022-0001)

- Non-transparent sharing of branch predictor within a context in some Intel(R) Processors may allow an authorized user to potentially enable information disclosure via local access. (CVE-2022-0002)

- A flaw was found in the way the flags member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe and push_pipe functions in the Linux kernel and could thus contain stale values. An unprivileged local user could use this flaw to write to pages in the page cache backed by read only files and as such escalate their privileges on the system. (CVE-2022-0847)

- A use-after-free exists in the Linux Kernel in tc_new_tfilter that could allow a local attacker to gain privilege escalation. The exploit requires unprivileged user namespaces. We recommend upgrading past commit 04c2a47ffb13c29778e2a14e414ad4cb5a5db4b5 (CVE-2022-1055)

- Certain Arm Cortex and Neoverse processors through 2022-03-08 do not properly restrict cache speculation, aka Spectre-BHB. An attacker can leverage the shared branch history in the Branch History Buffer (BHB) to influence mispredicted branches. Then, cache allocation can allow the attacker to obtain sensitive information. (CVE-2022-23960)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Run 'dnf update --releasever=2022.0.20220308 kernel' to update your system.

See Also

https://alas.aws.amazon.com/AL2022/ALAS-2022-039.html

https://alas.aws.amazon.com/cve/html/CVE-2021-26341.html

https://alas.aws.amazon.com/cve/html/CVE-2021-26401.html

https://alas.aws.amazon.com/cve/html/CVE-2022-0001.html

https://alas.aws.amazon.com/cve/html/CVE-2022-0002.html

https://alas.aws.amazon.com/cve/html/CVE-2022-0847.html

https://alas.aws.amazon.com/cve/html/CVE-2022-1055.html

https://alas.aws.amazon.com/cve/html/CVE-2022-23960.html

Plugin Details

Severity: High

ID: 164727

File Name: al2022_ALAS2022-2022-039.nasl

Version: 1.3

Type: local

Agent: unix

Published: 9/6/2022

Updated: 9/7/2022

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

Risk Information

VPR

Risk Factor: Critical

Score: 9.8

CVSS v2

Risk Factor: High

Base Score: 7.2

Temporal Score: 6.3

Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C

Temporal Vector: E:H/RL:OF/RC:C

CVSS Score Source: CVE-2022-0847

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 7.5

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: E:H/RL:O/RC:C

CVSS Score Source: CVE-2022-1055

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:bpftool, p-cpe:/a:amazon:linux:bpftool-debuginfo, p-cpe:/a:amazon:linux:kernel, p-cpe:/a:amazon:linux:kernel-debuginfo, p-cpe:/a:amazon:linux:kernel-debuginfo-common-aarch64, p-cpe:/a:amazon:linux:kernel-debuginfo-common-x86_64, p-cpe:/a:amazon:linux:kernel-devel, p-cpe:/a:amazon:linux:kernel-headers, p-cpe:/a:amazon:linux:kernel-livepatch-5.15.25-14.106, p-cpe:/a:amazon:linux:kernel-tools, p-cpe:/a:amazon:linux:kernel-tools-debuginfo, p-cpe:/a:amazon:linux:kernel-tools-devel, p-cpe:/a:amazon:linux:perf, p-cpe:/a:amazon:linux:perf-debuginfo, p-cpe:/a:amazon:linux:python3-perf, p-cpe:/a:amazon:linux:python3-perf-debuginfo, cpe:/o:amazon:linux:2022

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: 3/7/2022

Vulnerability Publication Date: 3/7/2022

CISA Known Exploited Dates: 5/16/2022

Exploitable With

CANVAS (CANVAS)

Metasploit (Dirty Pipe Local Privilege Escalation via CVE-2022-0847)

Reference Information

CVE: CVE-2021-26341, CVE-2021-26401, CVE-2022-0001, CVE-2022-0002, CVE-2022-0847, CVE-2022-1055, CVE-2022-23960