CVE-2021-22100: Cloud Controller is vulnerable to denial of service due to misbehaving service brokers | Cloud Foundry

Severity

Medium

Vendor

Cloud Foundry Foundation

Description

Cloud Controller (CAPI) is vulnerable to a denial-of-service attack in which a developer can push a service broker that (accidentally or maliciously) causes CC instances to timeout and fail. An attacker can leverage this vulnerability to cause an inability for anyone to push or manage apps.

Affected Cloud Foundry Products and Versions

Severity is medium unless otherwise noted.

• CAPI
  • All versions prior to 1.122.0
• CF Deployment
  • All versions prior to 17.1.0

Mitigation

Users of affected products are strongly encouraged to follow the mitigations below. The Cloud Foundry project recommends upgrading the following releases:

• CAPI

  • Upgrade all versions to 1.122.0 or greater

• CF Deployment

  • Upgrade all versions to 17.1.0 or greater

  and configure cc.max_concurrent_service_broker_requests to a reasonable value (e.g. 3).

Credit

This issue was responsibly reported by Florian Braun (SAP SE)

History

2022-03-25: Initial vulnerability report published.