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CVE-2021-41103

Publication date 4 October 2021

Last updated 24 July 2024

Ubuntu priority

High

Why this priority?

Cvss 3 Severity Score

7.8 · High

Score breakdown

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.

Status

Package Ubuntu Release Status
containerd 22.04 LTS jammy
Fixed 1.5.5-0ubuntu3
21.10 impish
Fixed 1.5.5-0ubuntu3
21.04 hirsute
Fixed 1.5.2-0ubuntu1~21.04.3
20.04 LTS focal
Fixed 1.5.2-0ubuntu1~20.04.3
18.04 LTS bionic
Fixed 1.5.2-0ubuntu1~18.04.3
16.04 LTS xenial
14.04 LTS trusty Not in release

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Severity score breakdown

Parameter Value
Base score 7.8 · High
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

    • USN-5100-1
    • containerd vulnerability
    • 4 October 2021
    • USN-5521-1
    • containerd vulnerabilities
    • 15 July 2022

Other references