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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.

Related Files

Red Hat Security Advisory 2022-2183-01
Posted May 12, 2022
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2022-2183-01 - Release osp-director-operator images. Issues addressed include a denial of service vulnerability.

tags | advisory, denial of service
systems | linux, redhat
advisories | CVE-2018-25032, CVE-2019-11253, CVE-2019-19794, CVE-2020-15257, CVE-2021-29482, CVE-2021-32760, CVE-2022-1154, CVE-2022-1271
SHA-256 | cc75dc0ea9405e57725d05b12cad495f4f0943e8d0b5bc731db97d78ca8246b7
Gentoo Linux Security Advisory 202105-33
Posted May 26, 2021
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 202105-33 - Multiple vulnerabilities have been found in containerd, the worst of which could result in privilege escalation. Versions less than 1.4.4 are affected.

tags | advisory, vulnerability
systems | linux, gentoo
advisories | CVE-2020-15257, CVE-2021-21334
SHA-256 | 464048d530e7c8af9bee99459ab4f508fe39be7c1ab8c788da356d06da5b1652
Debian Security Advisory 4865-1
Posted Feb 28, 2021
Authored by Debian | Site debian.org

Debian Linux Security Advisory 4865-1 - Multiple security issues were discovered in Docker, a Linux container runtime, which could result in denial of service, an information leak or privilege escalation.

tags | advisory, denial of service
systems | linux, debian
advisories | CVE-2020-15157, CVE-2020-15257, CVE-2021-21284, CVE-2021-21285
SHA-256 | 7dc2d80b850f6bd28a9e9f63dfe2208b8767f34538778cfff1dac3efbf2d1d04
Ubuntu Security Notice USN-4653-1
Posted Dec 1, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4653-1 - It was discovered that access controls for the shim’s API socket did not restrict access to the abstract unix domain socket in some cases. An attacker could use this vulnerability to run containers with elevated privileges.

tags | advisory
systems | linux, unix, ubuntu
advisories | CVE-2020-15257
SHA-256 | 4a2bc41ae485150abd3573d1dae6f74a8e578dbc67939eb1473b47262a286acf
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