ubuntu-cve-2021-41103
Vulnerability from osv_ubuntu
Published
2021-10-04 00:00
Modified
2025-09-08 16:47
Summary
Details
containerd is an open source container runtime with an emphasis on simplicity, robustness and portability. A bug was found in containerd where container root directories and some plugins had insufficiently restricted permissions, allowing otherwise unprivileged Linux users to traverse directory contents and execute programs. When containers included executable programs with extended permission bits (such as setuid), unprivileged Linux users could discover and execute those programs. When the UID of an unprivileged Linux user on the host collided with the file owner or group inside a container, the unprivileged Linux user on the host could discover, read, and modify those files. This vulnerability has been fixed in containerd 1.4.11 and containerd 1.5.7. Users should update to these version when they are released and may restart containers or update directory permissions to mitigate the vulnerability. Users unable to update should limit access to the host to trusted users. Update directory permission on container bundles directories.
Severity
7.8 (High)
5.9 (Medium)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "containerd",
"binary_version": "1.2.6-0ubuntu1~16.04.6+esm2"
},
{
"binary_name": "golang-github-docker-containerd-dev",
"binary_version": "1.2.6-0ubuntu1~16.04.6+esm2"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "containerd",
"purl": "pkg:deb/ubuntu/containerd@1.2.6-0ubuntu1~16.04.6+esm2?arch=source\u0026distro=esm-apps/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.2.6-0ubuntu1~16.04.6+esm2"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.2.1-0ubuntu4~16.04",
"0.2.3-0ubuntu1~16.04",
"0.2.5-0ubuntu1~16.04.1",
"1.2.6-0ubuntu1~16.04.2",
"1.2.6-0ubuntu1~16.04.3",
"1.2.6-0ubuntu1~16.04.4",
"1.2.6-0ubuntu1~16.04.5",
"1.2.6-0ubuntu1~16.04.6",
"1.2.6-0ubuntu1~16.04.6+esm1"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "containerd",
"binary_version": "1.5.2-0ubuntu1~18.04.3"
},
{
"binary_name": "golang-github-containerd-containerd-dev",
"binary_version": "1.5.2-0ubuntu1~18.04.3"
},
{
"binary_name": "golang-github-docker-containerd-dev",
"binary_version": "1.5.2-0ubuntu1~18.04.3"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "containerd",
"purl": "pkg:deb/ubuntu/containerd@1.5.2-0ubuntu1~18.04.3?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.5.2-0ubuntu1~18.04.3"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.2.5-0ubuntu2",
"1.2.6-0ubuntu1~18.04.1",
"1.2.6-0ubuntu1~18.04.2",
"1.3.3-0ubuntu1~18.04.1",
"1.3.3-0ubuntu1~18.04.2",
"1.3.3-0ubuntu1~18.04.3",
"1.3.3-0ubuntu1~18.04.4",
"1.4.4-0ubuntu1~18.04.2",
"1.5.2-0ubuntu1~18.04.1",
"1.5.2-0ubuntu1~18.04.2"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "containerd",
"binary_version": "1.5.2-0ubuntu1~20.04.3"
},
{
"binary_name": "golang-github-containerd-containerd-dev",
"binary_version": "1.5.2-0ubuntu1~20.04.3"
},
{
"binary_name": "golang-github-docker-containerd-dev",
"binary_version": "1.5.2-0ubuntu1~20.04.3"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "containerd",
"purl": "pkg:deb/ubuntu/containerd@1.5.2-0ubuntu1~20.04.3?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.5.2-0ubuntu1~20.04.3"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.2.10-0ubuntu1",
"1.3.2-0ubuntu1",
"1.3.3-0ubuntu1",
"1.3.3-0ubuntu2",
"1.3.3-0ubuntu2.1",
"1.3.3-0ubuntu2.2",
"1.3.3-0ubuntu2.3",
"1.4.4-0ubuntu1~20.04.2",
"1.5.2-0ubuntu1~20.04.1",
"1.5.2-0ubuntu1~20.04.2"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "containerd",
"binary_version": "1.5.5-0ubuntu3"
},
{
"binary_name": "golang-github-containerd-containerd-dev",
"binary_version": "1.5.5-0ubuntu3"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "containerd",
"purl": "pkg:deb/ubuntu/containerd@1.5.5-0ubuntu3?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.5.5-0ubuntu3"
}
],
"type": "ECOSYSTEM"
}
],
"versions": []
}
],
"aliases": [],
"details": "containerd is an open source container runtime with an emphasis on simplicity, robustness and portability. A bug was found in containerd where container root directories and some plugins had insufficiently restricted permissions, allowing otherwise unprivileged Linux users to traverse directory contents and execute programs. When containers included executable programs with extended permission bits (such as setuid), unprivileged Linux users could discover and execute those programs. When the UID of an unprivileged Linux user on the host collided with the file owner or group inside a container, the unprivileged Linux user on the host could discover, read, and modify those files. This vulnerability has been fixed in containerd 1.4.11 and containerd 1.5.7. Users should update to these version when they are released and may restart containers or update directory permissions to mitigate the vulnerability. Users unable to update should limit access to the host to trusted users. Update directory permission on container bundles directories.",
"id": "UBUNTU-CVE-2021-41103",
"modified": "2025-09-08T16:47:22Z",
"published": "2021-10-04T00:00:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2021-41103"
},
{
"type": "REPORT",
"url": "https://github.com/containerd/containerd/security/advisories/GHSA-c2h3-6mxw-7mvq"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-5100-1"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2021-41103"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-5521-1"
}
],
"related": [
"USN-5100-1",
"USN-5521-1"
],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
"type": "CVSS_V3"
},
{
"score": "high",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2021-41103"
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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