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CVE-2018-1002105: Privilege Escalation in Kubernetes

February 15, 2022 (updated April 12, 2022)

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.

References

  • access.redhat.com/errata/RHSA-2018:3537
  • access.redhat.com/errata/RHSA-2018:3549
  • access.redhat.com/errata/RHSA-2018:3551
  • access.redhat.com/errata/RHSA-2018:3598
  • access.redhat.com/errata/RHSA-2018:3624
  • access.redhat.com/errata/RHSA-2018:3742
  • access.redhat.com/errata/RHSA-2018:3752
  • access.redhat.com/errata/RHSA-2018:3754
  • github.com/advisories/GHSA-579h-mv94-g4gp
  • github.com/evict/poc_CVE-2018-1002105
  • github.com/kubernetes/kubernetes/commit/2257c1ecbe3c0cf71dd50b82752ae189c94ec905
  • github.com/kubernetes/kubernetes/issues/71411
  • groups.google.com/forum/
  • lists.opensuse.org/opensuse-security-announce/2020-04/msg00041.html
  • nvd.nist.gov/vuln/detail/CVE-2018-1002105
  • security.netapp.com/advisory/ntap-20190416-0001/
  • www.coalfire.com/The-Coalfire-Blog/December-2018/Kubernetes-Vulnerability-What-You-Can-Should-Do
  • www.exploit-db.com/exploits/46052/
  • www.exploit-db.com/exploits/46053
  • www.exploit-db.com/exploits/46053/
  • www.openwall.com/lists/oss-security/2019/06/28/2
  • www.openwall.com/lists/oss-security/2019/07/06/3
  • www.openwall.com/lists/oss-security/2019/07/06/4
  • www.securityfocus.com/bid/106068

Code Behaviors & Features

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Affected versions

All versions before 1.10.11, all versions starting from 1.11.0 before 1.11.5, all versions starting from 1.12.0 before 1.12.3

Fixed versions

  • 1.10.11
  • 1.11.5
  • 1.12.3

Solution

Upgrade to versions 1.10.11, 1.11.5, 1.12.3 or above.

Impact 9.8 CRITICAL

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Learn more about CVSS

Weakness

  • CWE-388

Source file

go/github.com/kubernetes/kubernetes/CVE-2018-1002105.yml

Spotted a mistake? Edit the file on GitLab.

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