GHSA-m8cg-xc2p-r3fc

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/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) 2. or, 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.

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/cgroup to maskedPaths

Database specific

{
    "cwe_ids": [
        "CWE-281"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2023-03-30T20:17:24Z",
    "nvd_published_at": "2023-03-29T19:15:00Z",
    "severity": "LOW"
}

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

Affected ranges

Type: SEMVER
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

1.1.5