Insufficiently restricted permissions on plugin directories

CAO 7.8CVE-2021-41103 · GHSA-c2h3-6mxw-7mvq · GO-2022-0938 · Công bố 04/10/2021 · cập nhật 17/06/2026

Tóm tắt nhanh

CVE-2021-41103 là lỗ hổng mức CAO (CVSS 7.8) ảnh hưởng github.com/containerd/containerd, containerd (linuxfoundation).
Xác suất bị khai thác trong 30 ngày tới (EPSS): 0.52%, cao hơn 44.1% các lỗ hổng khác.
Cách xử lý: cập nhật lên 1.5.7, 1.4.11 hoặc mới hơn.

Gói / sản phẩm	Phiên bản bị ảnh hưởng	Phiên bản đã vá
github.com/containerd/containerd Go	`≥ 1.5.0, < 1.5.7< 1.4.11`	`1.5.71.4.11`
containerd linuxfoundation	`≥ 1.5.0, < 1.5.7< 1.4.11`	`1.5.71.4.11`

Mô tả

Impact

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.

Patches

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.

Workarounds

Limit access to the host to trusted users. Update directory permission on container bundles directories.

For more information

If you have any questions or comments about this advisory:

Open an issue in github.com/containerd/containerd
Email us at [email protected]

Mô tả của NVD

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.