Amazon Linux AMI : docker (ALAS-2021-1537)

high Nessus Plugin ID 153861

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Synopsis

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

Description

The version of docker installed on the remote host is prior to 20.10.7-3.71. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS-2021-1537 advisory.

A bug was found in Moby (Docker Engine) where attempting to copy files using docker cp into a specially- crafted container can result in Unix file permission changes for existing files in the host 2019s filesystem, widening access to others. This bug does not directly allow files to be read, modified, or executed without an additional cooperating process. (CVE-2021-41089)

A bug was found in Moby (Docker Engine) where the data directory (typically /var/lib/docker) contained subdirectories with insufficiently restricted permissions, allowing otherwise unprivileged Linux users to traverse directory contents and execute programs. When containers included executable programs with extended permission bits (such as setuid), unprivileged Linux users could discover and execute those programs. When the UID of an unprivileged Linux user on the host collided with the file owner or group inside a container, the unprivileged Linux user on the host could discover, read, and modify those files.
(CVE-2021-41091)

A bug was found in the Docker CLI where running docker login my-private-registry.example.com with a misconfigured configuration file (typically ~/.docker/config.json) listing a credsStore or credHelpers that could not be executed would result in any provided credentials being sent to registry-1.docker.io rather than the intended private registry. (CVE-2021-41092)

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 docker' to update your system.

Plugin Details

Severity: High

ID: 153861

File Name: ala_ALAS-2021-1537.nasl

Version: 1.5

Type: local

Agent: unix

Family: Amazon Linux Local Security Checks

Published: 10/4/2021

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: 4.9

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.9

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

CVSS Score Source: CVE-2021-41092

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.7

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

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:amazon:linux, p-cpe:/a:amazon:linux:docker, p-cpe:/a:amazon:linux:docker-debuginfo

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: 9/30/2021

Vulnerability Publication Date: 9/30/2021

Reference Information

CVE: CVE-2021-41089, CVE-2021-41091, CVE-2021-41092

ALAS: 2021-1537

Detections

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