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CVE-2023-25809

Published: 29 March 2023

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`.

Priority

Medium

Cvss 3 Severity Score

6.3

Score breakdown

Status

Package Release Status
runc
Launchpad, Ubuntu, Debian
bionic
Released (1.1.4-0ubuntu1~18.04.2)
focal
Released (1.1.4-0ubuntu1~20.04.3)
jammy
Released (1.1.4-0ubuntu1~22.04.3)
kinetic
Released (1.1.4-0ubuntu1~22.10.3)
lunar
Released (1.1.4-0ubuntu3.1)
trusty Ignored
(end of standard support)
upstream
Released (1.1.5+ds1-1)
xenial
Released (1.0.0~rc7+git20190403.029124da-0ubuntu1~16.04.4+esm4)
Available with Ubuntu Pro

Severity score breakdown

Parameter Value
Base score 6.3
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Changed
Confidentiality Low
Integrity impact Low
Availability impact Low
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L