CVE-2019-1002100: Kubernetes API Server Patch Request Consumes Excess Resource Cause Denial of Service

Severity

Medium

Vendor

Cloud Foundry Foundation

Affected Cloud Foundry Products and Versions

• Cloud Foundry Container Runtime (CFCR)
  • All versions prior to 0.31.0

Description

In all Kubernetes versions prior to v1.11.8, v1.12.6, and v1.13.4, users that are authorized to make patch requests to the Kubernetes API Server can send a specially crafted patch of type “json-patch” (e.g. `kubectl patch –type json` or `”Content-Type: application/json-patch+json”`) that consumes excessive resources while processing, causing a Denial of Service on the API Server.

Mitigation

Users of affected versions should apply the following mitigations or upgrades:

• Releases that have fixed this issue include:
  • CFCR version 0.31.0

History

2019-04-01: Initial vulnerability report published.