요약
- CVE-2023-25809은(는) github.com/opencontainers/runc, runc (linuxfoundation)에 영향을 주는 보통 (CVSS 6.3) 취약점입니다.
- 향후 30일 내 악용 확률(EPSS): 0.32%, 전체 취약점의 24.9%보다 높음.
- 조치: 1.1.5 이상으로 업데이트하세요.
Description
Impact
It was found that rootless runc makes /sys/fs/cgroup writable in following conditons:
- 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, 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
NVD description
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`.
github.com/opencontainers/runc의 다른 취약점
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