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CVE-2023-25809

Status Candidate

Overview

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`.

Related Files

Ubuntu Security Notice USN-6088-2
Posted May 24, 2023
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6088-2 - USN-6088-1 fixed vulnerabilities in runC. This update provides the corresponding updates for Ubuntu 16.04 LTS. It was discovered that runC incorrectly performed access control when mounting /proc to non-directories. An attacker could possibly use this issue to escalate privileges. Felix Wilhelm discovered that runC incorrecly handled netlink messages. An attacker could possibly use this issue to escalate privileges.

tags | advisory, vulnerability
systems | linux, ubuntu
advisories | CVE-2019-19921, CVE-2021-43784, CVE-2022-29162, CVE-2023-25809, CVE-2023-27561, CVE-2023-28642
SHA-256 | 228e4e8430141c4a888658c04e39158326161025cc9773182744d3522bc81a9d
Ubuntu Security Notice USN-6088-1
Posted May 18, 2023
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6088-1 - It was discovered that runC incorrectly made /sys/fs/cgroup writable when in rootless mode. An attacker could possibly use this issue to escalate privileges. It was discovered that runC incorrectly performed access control when mounting /proc to non-directories. An attacker could possibly use this issue to escalate privileges. It was discovered that runC incorrectly handled /proc and /sys mounts inside a container. An attacker could possibly use this issue to bypass AppArmor, and potentially SELinux.

tags | advisory
systems | linux, ubuntu
advisories | CVE-2023-25809, CVE-2023-27561, CVE-2023-28642
SHA-256 | 2f031ce092f7d0711f57fff73989b5ab760a9919f81cb22a319eeecb62e33b00
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