Withdrawn by the publisher.

Affected: CleanStart: containerd

Security vulnerability affects the containerd package. containerd is an industry-standard container runtime and is available as a daemon for Linux and Windows.

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…

Affected: Go: github.com/containerd/containerd

## Impact

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.

### Specific Go Packages Affected github.com/containerd/containerd/cmd

## Patches

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.

## Workarounds

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 adv…

Security update for containerd, docker, docker-runc, golang-github-docker-libnetwork

kubernetes: YAML parsing vulnerable to "Billion Laughs" attack, allowing for remote denial of service golang-github-miekg-dns: predictable TXID can lead to response forgeries containerd: unrestricted access to abstract Unix domain socket can lead to privileges escalation ulikunitz/xz: Infinite loop in readUvarint allows for denial of service containerd: pulling and extracting crafted container image may result in Unix file permission changes

Security update for containerd, docker, docker-runc, golang-github-docker-libnetwork

Affected: Ubuntu:16.04:LTS: containerd, Ubuntu:18.04:LTS: containerd, Ubuntu:20.04:LTS: containerd

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…

Ein entfernter, authentisierter Angreifer kann eine Schwachstelle in docker und Kubernetes ausnutzen, um seine Privilegien zu erhöhen.