CVE-2020-26278

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Summary

CVECVE-2020-26278
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-01-20 22:15:00 UTC
Updated2021-02-02 15:26:00 UTC
DescriptionWeave Net is open source software which creates a virtual network that connects Docker containers across multiple hosts and enables their automatic discovery. Weave Net before version 2.8.0 has a vulnerability in which can allow an attacker to take over any host in the cluster. Weave Net is supplied with a manifest that runs pods on every node in a Kubernetes cluster, which are responsible for managing network connections for all other pods in the cluster. This requires a lot of power over the host, and the manifest sets `privileged: true`, which gives it that power. It also set `hostPID: true`, which gave it the ability to access all other processes on the host, and write anywhere in the root filesystem of the host. This setting was not necessary, and is being removed. You are only vulnerable if you have an additional vulnerability (e.g. a bug in Kubernetes) or misconfiguration that allows an attacker to run code inside the Weave Net pod, No such bug is known at the time of release, and there are no known instances of this being exploited. Weave Net 2.8.0 removes the hostPID setting and moves CNI plugin install to an init container. Users who do not update to 2.8.0 can edit the hostPID line in their existing DaemonSet manifest to say false instead of true, arrange some other way to install CNI plugins (e.g. Ansible) and remove those mounts from the DaemonSet manifest.

Risk And Classification

Problem Types: CWE-250

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Weave Weave All All All All
Application Weave Weave All All All All

References

ReferenceSourceLinkTags
weave/CHANGELOG.md at master · weaveworks/weave · GitHub MISC github.com Release Notes, Third Party Advisory
Stop running in host PID namespace · weaveworks/weave@a0ac81b · GitHub MISC github.com Patch, Third Party Advisory
Weave Net Pods can be used to escalate other Kubernetes vulnerabilities · Advisory · weaveworks/weave · GitHub CONFIRM github.com Third Party Advisory
For K8s, stop running in host PID namespace by bboreham · Pull Request #3876 · weaveworks/weave · GitHub MISC github.com Patch, Third Party Advisory
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