CVE-2023-25809
Assigner: GitHub_M
Published: 2023-03-29T18:22:56.875Z
State: PUBLISHED
title: rootless: `/sys/fs/cgroup` is writable when cgroupns isn't unshared in runc
problemTypes: descriptions: cweId: CWE-281
description: CWE-281: Improper Preservation of Permissions
type: CWE
metrics: cvssV3_1: attackComplexity: HIGH
attackVector: LOCAL
availabilityImpact: LOW
baseScore: 5
baseSeverity: MEDIUM
confidentialityImpact: LOW
integrityImpact: LOW
privilegesRequired: HIGH
scope: CHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:L
version: 3.1
affected: vendor: opencontainers
product: runc
versions: version: < 1.1.5
status: affected
descriptions: value: 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`.

source: advisory: GHSA-m8cg-xc2p-r3fc
discovery: UNKNOWN