runc is a CLI tool for spawning and running containers according to the OCI specification. In affected versions it was found that rootless runc makes `/sys/fs/cgroup` writable in following conditons: 1. when runc is executed inside the user namespace, and the `config.json` does not specify the cgroup namespace to be unshared (e.g.., `(docker|podman|nerdctl) run --cgroupns=host`, with Rootless Docker/Podman/nerdctl) or 2. when runc is executed outside the user namespace, and `/sys` is mounted with `rbind, ro` (e.g., `runc spec --rootless`; this condition is very rare). A container may gain the write access to user-owned cgroup hierarchy `/sys/fs/cgroup/user.slice/...` on the host . Other users's cgroup hierarchies are not affected. Users are advised to upgrade to version 1.1.5. Users unable to upgrade may unshare the cgroup namespace (`(docker|podman|nerdctl) run --cgroupns=private)`. This is the default behavior of Docker/Podman/nerdctl on cgroup v2 hosts. or add `/sys/fs/cgroup` to `maskedPaths`.
History

No history.

cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2023-03-29T18:22:56.875Z

Updated: 2024-08-02T11:32:12.344Z

Reserved: 2023-02-15T16:34:48.772Z

Link: CVE-2023-25809

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2023-03-29T19:15:22.170

Modified: 2023-11-07T04:09:12.663

Link: CVE-2023-25809

cve-icon Redhat

Severity : Moderate

Publid Date: 2023-03-29T00:00:00Z

Links: CVE-2023-25809 - Bugzilla