CVE-2018-1002105: Github.com/kubernetes/kubernetes Privilege Escalation Vulnerability

CRITICAL
Advisory Identifier: GHSA-579h-mv94-g4gp
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CVSS 9.8
CWE-269
Published
Advisory Summary

CVE-2018-1002105 is a CRITICAL (CVSS 9.8) privilege escalation vulnerability (CWE-269: Improper Privilege Management) affecting Github.com/kubernetes/kubernetes libraries in the Go ecosystem. The issue involves privilege escalation in kubernetes. Remediation is available by upgrading affected packages to version 1.10.11, 1.11.5, 1.12.3.

CVE-2018-1002105 at a Glance

CVE Identifier CVE-2018-1002105
GHSA Identifier GHSA-579h-mv94-g4gp
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-269: Improper Privilege Management
Affected Product Github.com/kubernetes/kubernetes
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 9.8

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2018-1002105

To remediate this vulnerability, upgrade all affected Github.com/kubernetes/kubernetes dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

github.com/kubernetes/kubernetes fixed: 1.10.11 
Upgrade github.com/kubernetes/kubernetes to 1.10.11
github.com/kubernetes/kubernetes fixed: 1.11.5 
Upgrade github.com/kubernetes/kubernetes to 1.11.5
github.com/kubernetes/kubernetes fixed: 1.12.3 
Upgrade github.com/kubernetes/kubernetes to 1.12.3
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for github.com/kubernetes/kubernetes

How to Check if You Are Affected

To determine whether your application is affected by CVE-2018-1002105, inspect your project dependencies for Github.com/kubernetes/kubernetes:

inspect dependencies for github.com/kubernetes/kubernetes

Analyze the terminal output to locate any version of Github.com/kubernetes/kubernetes in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.10.11), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-269: Improper Privilege Management, where the product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. In Github.com/kubernetes/kubernetes, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

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.

CVE-2018-1002105 Affected Github.com/kubernetes/kubernetes Versions

3 component(s)
Fixed Versions:
1.10.111.11.51.12.3
Product / Package Ecosystem Affected Versions Fixed Version
github.com/kubernetes/kubernetes
golang/github.com/kubernetes/kubernetes
Go
< 1.10.11
1.10.11
github.com/kubernetes/kubernetes
golang/github.com/kubernetes/kubernetes
Go
≥ 1.11.0
< 1.11.5
1.11.5
github.com/kubernetes/kubernetes
golang/github.com/kubernetes/kubernetes
Go
≥ 1.12.0
< 1.12.3
1.12.3

References

Github.com/kubernetes/kubernetes Source Repository REPOSITORY
https://github.com/evict/poc_CVE-2018-1002105
access.redhat.com/errata/rhsa-2018:37... WEB
https://access.redhat.com/errata/RHSA-2018:3754
access.redhat.com/errata/rhsa-2018:37... WEB
https://access.redhat.com/errata/RHSA-2018:3752
access.redhat.com/errata/rhsa-2018:37... WEB
https://access.redhat.com/errata/RHSA-2018:3742
access.redhat.com/errata/rhsa-2018:36... WEB
https://access.redhat.com/errata/RHSA-2018:3624
access.redhat.com/errata/rhsa-2018:35... WEB
https://access.redhat.com/errata/RHSA-2018:3598
access.redhat.com/errata/rhsa-2018:35... WEB
https://access.redhat.com/errata/RHSA-2018:3551
access.redhat.com/errata/rhsa-2018:35... WEB
https://access.redhat.com/errata/RHSA-2018:3549
NVD — CVE-2018-1002105 NVD
https://nvd.nist.gov/vuln/detail/CVE-2018-1002105
Github.com/kubernetes/kubernetes Source Repository REPOSITORY
https://github.com/kubernetes/kubernetes/issues/71411
Security Fix Commit FIX COMMIT
https://github.com/kubernetes/kubernetes/commit/2257c1ecbe3c0cf71dd50b82752ae189c94ec905
Github.com/kubernetes/kubernetes Security Information SECURITY
https://www.securityfocus.com/bid/106068
Github.com/kubernetes/kubernetes Security Information SECURITY
https://www.openwall.com/lists/oss-security/2019/07/06/4
Github.com/kubernetes/kubernetes Security Information SECURITY
https://www.openwall.com/lists/oss-security/2019/07/06/3
Github.com/kubernetes/kubernetes Security Information SECURITY
https://www.openwall.com/lists/oss-security/2019/06/28/2
www.exploit-db.com/exploits/46053 WEB
https://www.exploit-db.com/exploits/46053
www.exploit-db.com/exploits/46052 WEB
https://www.exploit-db.com/exploits/46052
www.coalfire.com/the-coalfire-blog/d... WEB
https://www.coalfire.com/The-Coalfire-Blog/December-2018/Kubernetes-Vulnerability-What-You-Can-Should-Do
Github.com/kubernetes/kubernetes Security Information SECURITY
https://security.netapp.com/advisory/ntap-20190416-0001
Github.com/kubernetes/kubernetes Security Information SECURITY
https://lists.opensuse.org/opensuse-security-announce/2020-04/msg00041.html
groups.google.com/forum/ WEB
https://groups.google.com/forum/#!topic/kubernetes-announce/GVllWCg6L88
access.redhat.com/errata/rhsa-2018:35... WEB
https://access.redhat.com/errata/RHSA-2018:3537

Frequently Asked Questions

What is CVE-2018-1002105?
CVE-2018-1002105 is a security vulnerability in Github.com/kubernetes/kubernetes involving Privilege Escalation in Kubernetes under CWE-269: Improper Privilege Management.
Which Github.com/kubernetes/kubernetes versions are affected?
Affected versions include releases prior to 1.10.11, 1.11.5, 1.12.3 across affected packages: github.com/kubernetes/kubernetes.
What version fixes CVE-2018-1002105?
Upgrading to 1.10.11, 1.11.5, 1.12.3 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/kubernetes/kubernetes affected?
Yes, github.com/kubernetes/kubernetes is affected in releases prior to 1.10.11, 1.11.5, 1.12.3. Upgrade your dependency to 1.10.11, 1.11.5, 1.12.3 or later.
What is the CVSS score of CVE-2018-1002105?
CVE-2018-1002105 has a CVSS v3.1 base score of 9.8 (CRITICAL) with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2018-1002105?
CVE-2018-1002105 is classified under CWE-269: Improper Privilege Management (The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor.).
How can I check Go dependencies for CVE-2018-1002105?
Run the dependency tree command: 'inspect dependencies for github.com/kubernetes/kubernetes'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-579h-mv94-g4gp",
  "modified" : "2021-05-20T20:40:04Z",
  "published" : "2022-02-15T01:57:18Z",
  "aliases" : [ "CVE-2018-1002105" ],
  "summary" : "Privilege Escalation in Kubernetes",
  "details" : "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.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/kubernetes/kubernetes"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.10.11"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/kubernetes/kubernetes"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.11.0"
      }, {
        "fixed" : "1.11.5"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/kubernetes/kubernetes"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.12.0"
      }, {
        "fixed" : "1.12.3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2018-1002105"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/kubernetes/kubernetes/issues/71411"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/kubernetes/kubernetes/commit/2257c1ecbe3c0cf71dd50b82752ae189c94ec905"
  }, {
    "type" : "WEB",
    "url" : "https://www.securityfocus.com/bid/106068"
  }, {
    "type" : "WEB",
    "url" : "https://www.openwall.com/lists/oss-security/2019/07/06/4"
  }, {
    "type" : "WEB",
    "url" : "https://www.openwall.com/lists/oss-security/2019/07/06/3"
  }, {
    "type" : "WEB",
    "url" : "https://www.openwall.com/lists/oss-security/2019/06/28/2"
  }, {
    "type" : "WEB",
    "url" : "https://www.exploit-db.com/exploits/46053"
  }, {
    "type" : "WEB",
    "url" : "https://www.exploit-db.com/exploits/46052"
  }, {
    "type" : "WEB",
    "url" : "https://www.coalfire.com/The-Coalfire-Blog/December-2018/Kubernetes-Vulnerability-What-You-Can-Should-Do"
  }, {
    "type" : "WEB",
    "url" : "https://security.netapp.com/advisory/ntap-20190416-0001"
  }, {
    "type" : "WEB",
    "url" : "https://lists.opensuse.org/opensuse-security-announce/2020-04/msg00041.html"
  }, {
    "type" : "WEB",
    "url" : "https://groups.google.com/forum/#!topic/kubernetes-announce/GVllWCg6L88"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/evict/poc_CVE-2018-1002105"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2018:3754"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2018:3752"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2018:3742"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2018:3624"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2018:3598"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2018:3551"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2018:3549"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2018:3537"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-269" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-05-20T20:40:04Z",
    "nvd_published_at" : null
  }
}