Amazon Linux AMI : containerd (ALAS-2021-1540)

high Nessus Plugin ID 153864

Synopsis

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

Description

The version of containerd installed on the remote host is prior to 1.4.6-3.9. It is, therefore, affected by a vulnerability as referenced in the ALAS-2021-1540 advisory.

- containerd is an open source container runtime with an emphasis on simplicity, robustness and portability.
A bug was found in containerd where container root directories and some plugins had 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. This vulnerability has been fixed in containerd 1.4.11 and containerd 1.5.7. Users should update to these version when they are released and may restart containers or update directory permissions to mitigate the vulnerability. Users unable to update should limit access to the host to trusted users. Update directory permission on container bundles directories. (CVE-2021-41103)

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

Solution

Run 'yum update containerd' to update your system.

See Also

https://alas.aws.amazon.com/ALAS-2021-1540.html

https://access.redhat.com/security/cve/CVE-2021-41103

Plugin Details

Severity: High

ID: 153864

File Name: ala_ALAS-2021-1540.nasl

Version: 1.3

Type: local

Agent: unix

Published: 10/4/2021

Updated: 10/19/2021

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

Risk Information

CVSS Score Source: CVE-2021-41103

VPR

Risk Factor: High

Score: 7.4

CVSS v2

Risk Factor: High

Base Score: 7.2

Temporal Score: 5.3

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

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

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

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

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

Vulnerability Information

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

Required KB Items: Host/local_checks_enabled, Host/AmazonLinux/release, Host/AmazonLinux/rpm-list

Exploit Ease: No known exploits are available

Patch Publication Date: 10/1/2021

Vulnerability Publication Date: 10/1/2021

Reference Information

CVE: CVE-2021-41103

ALAS: 2021-1540