GHSA-m8cg-xc2p-r3fc
Suggest an improvement- Source
- https://github.com/advisories/GHSA-m8cg-xc2p-r3fc
- Import Source
- https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2023/03/GHSA-m8cg-xc2p-r3fc/GHSA-m8cg-xc2p-r3fc.json
- JSON Data
- https://api.osv.dev/v1/vulns/GHSA-m8cg-xc2p-r3fc
- Aliases
- Related
- Published
- 2023-03-30T20:17:24Z
- Modified
- 2024-08-20T20:58:42.328556Z
- Severity
-
- 2.5 (Low) CVSS_V3 - CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:N/I:N/A:L CVSS Calculator
- Summary
- rootless: `/sys/fs/cgroup` is writable when cgroupns isn't unshared in runc
- Details
-
Impact
It was found that rootless runc makes
/sys/fs/cgroupwritable in following conditons: 1. when runc is executed inside the user namespace, and theconfig.jsondoes not specify the cgroup namespace to be unshared (e.g..,(docker|podman|nerdctl) run --cgroupns=host, with Rootless Docker/Podman/nerdctl) 2. or, when runc is executed outside the user namespace, and/sysis mounted withrbind, 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.Patches
v1.1.5 (planned)
Workarounds
- Condition 1: Unshare the cgroup namespace (
(docker|podman|nerdctl) run --cgroupns=private). This is the default behavior of Docker/Podman/nerdctl on cgroup v2 hosts. - Condition 2 (very rare): add
/sys/fs/cgrouptomaskedPaths
- Condition 1: Unshare the cgroup namespace (
- References
Affected packages
Go / github.com/opencontainers/runc
Package
- Name
- github.com/opencontainers/runc
- View open source insights on deps.dev
- Purl
- pkg:golang/github.com/opencontainers/runc