ghsa-m8cg-xc2p-r3fc
Vulnerability from github
Published
2023-03-30 20:17
Modified
2023-03-30 20:17
Severity ?
Summary
rootless: `/sys/fs/cgroup` is writable when cgroupns isn't unshared in runc
Details
Impact
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)
2. 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/cgrouptomaskedPaths
{
"affected": [
{
"package": {
"ecosystem": "Go",
"name": "github.com/opencontainers/runc"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.1.5"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2023-25809"
],
"database_specific": {
"cwe_ids": [
"CWE-281"
],
"github_reviewed": true,
"github_reviewed_at": "2023-03-30T20:17:24Z",
"nvd_published_at": "2023-03-29T19:15:00Z",
"severity": "LOW"
},
"details": "### Impact\nIt was found that rootless runc makes `/sys/fs/cgroup` writable in following conditons:\n1. 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)\n2. 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)\n\nA container may gain the write access to user-owned cgroup hierarchy `/sys/fs/cgroup/user.slice/...` on the host .\nOther users\u0027s cgroup hierarchies are not affected.\n\n### Patches\nv1.1.5 (planned)\n\n### Workarounds\n- 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.\n- Condition 2 (very rare): add `/sys/fs/cgroup` to `maskedPaths`\n",
"id": "GHSA-m8cg-xc2p-r3fc",
"modified": "2023-03-30T20:17:24Z",
"published": "2023-03-30T20:17:24Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/opencontainers/runc/security/advisories/GHSA-m8cg-xc2p-r3fc"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-25809"
},
{
"type": "WEB",
"url": "https://github.com/opencontainers/runc/commit/0d62b950e60f6980b54fe3bafd9a9c608dc1df17"
},
{
"type": "PACKAGE",
"url": "https://github.com/opencontainers/runc"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:N/I:N/A:L",
"type": "CVSS_V3"
}
],
"summary": "rootless: `/sys/fs/cgroup` is writable when cgroupns isn\u0027t unshared in runc"
}
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