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CVE-2021-32760

Publication date 19 July 2021

Last updated 24 July 2024

Ubuntu priority

High

Why this priority?

Cvss 3 Severity Score

6.3 · Medium

Score breakdown

containerd is a container runtime. A bug was found in containerd versions prior to 1.4.8 and 1.5.4 where pulling and extracting a specially-crafted container image can result in Unix file permission changes for existing files in the host’s filesystem. Changes to file permissions can deny access to the expected owner of the file, widen access to others, or set extended bits like setuid, setgid, and sticky. This bug does not directly allow files to be read, modified, or executed without an additional cooperating process. This bug has been fixed in containerd 1.5.4 and 1.4.8. As a workaround, ensure that users only pull images from trusted sources. Linux security modules (LSMs) like SELinux and AppArmor can limit the files potentially affected by this bug through policies and profiles that prevent containerd from interacting with specific files.

Status

Package Ubuntu Release Status
containerd 22.04 LTS jammy
Fixed 1.5.2-0ubuntu2
21.10 impish
Fixed 1.5.2-0ubuntu2
21.04 hirsute
Fixed 1.5.2-0ubuntu1~21.04.2
20.10 groovy
Fixed 1.5.2-0ubuntu1~20.10.2
20.04 LTS focal
Fixed 1.5.2-0ubuntu1~20.04.2
18.04 LTS bionic
Fixed 1.5.2-0ubuntu1~18.04.2
16.04 LTS xenial
14.04 LTS trusty Not in release

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Severity score breakdown

Parameter Value
Base score 6.3 · Medium
Attack vector Network
Attack complexity Low
Privileges required None
User interaction Required
Scope Unchanged
Confidentiality Low
Integrity impact Low
Availability impact Low
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L

References

Related Ubuntu Security Notices (USN)

    • USN-5012-1
    • containerd vulnerabilities
    • 20 July 2021
    • USN-5521-1
    • containerd vulnerabilities
    • 15 July 2022

Other references