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CVE-2023-25809

Publication date 29 March 2023

Last updated 24 July 2024

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

6.3 · Medium

Score breakdown

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`.

Status

Package Ubuntu Release Status
runc 23.04 lunar
Fixed 1.1.4-0ubuntu3.1
22.10 kinetic
Fixed 1.1.4-0ubuntu1~22.10.3
22.04 LTS jammy
Fixed 1.1.4-0ubuntu1~22.04.3
20.04 LTS focal
Fixed 1.1.4-0ubuntu1~20.04.3
18.04 LTS bionic
Fixed 1.1.4-0ubuntu1~18.04.2
16.04 LTS xenial
14.04 LTS trusty Ignored end of standard support

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Severity score breakdown

Parameter Value
Base score 6.3 · Medium
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