cve-2020-15257
Vulnerability from cvelistv5
Published
2020-12-01 02:30
Modified
2024-08-04 13:15
Severity ?
5.2 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Summary
containerd is an industry-standard container runtime and is available as a daemon for Linux and Windows. In containerd before versions 1.3.9 and 1.4.3, the containerd-shim API is improperly exposed to host network containers. Access controls for the shim’s API socket verified that the connecting process had an effective UID of 0, but did not otherwise restrict access to the abstract Unix domain socket. This would allow malicious containers running in the same network namespace as the shim, with an effective UID of 0 but otherwise reduced privileges, to cause new processes to be run with elevated privileges. This vulnerability has been fixed in containerd 1.3.9 and 1.4.3. Users should update to these versions as soon as they are released. It should be noted that containers started with an old version of containerd-shim should be stopped and restarted, as running containers will continue to be vulnerable even after an upgrade. If you are not providing the ability for untrusted users to start containers in the same network namespace as the shim (typically the "host" network namespace, for example with docker run --net=host or hostNetwork: true in a Kubernetes pod) and run with an effective UID of 0, you are not vulnerable to this issue. If you are running containers with a vulnerable configuration, you can deny access to all abstract sockets with AppArmor by adding a line similar to deny unix addr=@**, to your policy. It is best practice to run containers with a reduced set of privileges, with a non-zero UID, and with isolated namespaces. The containerd maintainers strongly advise against sharing namespaces with the host. Reducing the set of isolation mechanisms used for a container necessarily increases that container's privilege, regardless of what container runtime is used for running that container.
References
security-advisories@github.comhttps://github.com/containerd/containerd/commit/4a4bb851f5da563ff6e68a83dc837c7699c469adPatch, Third Party Advisory
security-advisories@github.comhttps://github.com/containerd/containerd/releases/tag/v1.4.3Third Party Advisory
security-advisories@github.comhttps://github.com/containerd/containerd/security/advisories/GHSA-36xw-fx78-c5r4Mitigation, Third Party Advisory
security-advisories@github.comhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LNKXLOLZWO5FMAPX63ZL7JNKTNNT5NQD/
security-advisories@github.comhttps://security.gentoo.org/glsa/202105-33Third Party Advisory
security-advisories@github.comhttps://www.debian.org/security/2021/dsa-4865Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/containerd/containerd/commit/4a4bb851f5da563ff6e68a83dc837c7699c469adPatch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/containerd/containerd/releases/tag/v1.4.3Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/containerd/containerd/security/advisories/GHSA-36xw-fx78-c5r4Mitigation, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LNKXLOLZWO5FMAPX63ZL7JNKTNNT5NQD/
af854a3a-2127-422b-91ae-364da2661108https://security.gentoo.org/glsa/202105-33Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.debian.org/security/2021/dsa-4865Third Party Advisory
Impacted products
Vendor Product Version
Show details on NVD website

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  }
}


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Sightings

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  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.