CVE-2024-48921: Github.com/kyverno/kyverno Kyverno's PolicyException Objects Can Be Vulnerability

HIGH
Advisory Identifier: GHSA-qjvc-p88j-j9rm
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CVSS 7.5
CWE-285 CWE-863
Published
Advisory Summary

CVE-2024-48921 is a HIGH (CVSS 7.5) kyverno's policyexception objects can be vulnerability (CWE-285: Improper Authorization) affecting Github.com/kyverno/kyverno libraries in the Go ecosystem. The issue involves kyverno's policyexception objects can be created in any namespace by default. Remediation is available by upgrading affected packages to version 1.13.0.

CVE-2024-48921 at a Glance

CVE Identifier CVE-2024-48921
GHSA Identifier GHSA-qjvc-p88j-j9rm
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-285: Improper Authorization
Affected Product Github.com/kyverno/kyverno
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 7.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N).

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 None (C:N)
Integrity High (I:H)
Availability None (A:N)

How to Fix CVE-2024-48921

To remediate this vulnerability, upgrade all affected Github.com/kyverno/kyverno 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/kyverno/kyverno fixed: 1.13.0 
Upgrade github.com/kyverno/kyverno to 1.13.0
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/kyverno/kyverno

How to Check if You Are Affected

To determine whether your application is affected by CVE-2024-48921, inspect your project dependencies for Github.com/kyverno/kyverno:

inspect dependencies for github.com/kyverno/kyverno

Analyze the terminal output to locate any version of Github.com/kyverno/kyverno in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.13.0), 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-285: Improper Authorization, where the product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. In Github.com/kyverno/kyverno, 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

### Summary A kyverno ClusterPolicy, ie. "disallow-privileged-containers," can be overridden by the creation of a PolicyException in a random namespace. ### Details By design, PolicyExceptions are consumed from any namespace. Administrators may not recognize that this allows users with privileges to non-kyverno namespaces to create exceptions. ### PoC 1. Administrator creates "disallow-privileged-containers" ClusterPolicy that applies to resources in the namespace "ubuntu-restricted" 2. Cluster user creates a PolicyException object for "disallow-privileged-containers" in namespace "ubuntu-restricted" 3. Cluster user creates a pod with a privileged container in "ubuntu-restricted" 4. Cluster user escalates to root on the node from the privileged container ### Impact Administrators attempting to enforce cluster security through kyverno policies, but that allow less privileged users to create resources

CVE-2024-48921 Affected Github.com/kyverno/kyverno Versions

1 component(s)
Fixed Versions:
1.13.0
Product / Package Ecosystem Affected Versions Fixed Version
github.com/kyverno/kyverno
golang/github.com/kyverno/kyverno
Go
< 1.13.0
1.13.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/kyverno/kyverno/security/advisories/GHSA-qjvc-p88j-j9rm
NVD — CVE-2024-48921 NVD
https://nvd.nist.gov/vuln/detail/CVE-2024-48921
Github.com/kyverno/kyverno Source Repository REPOSITORY
https://github.com/kyverno/kyverno

Frequently Asked Questions

What is CVE-2024-48921?
CVE-2024-48921 is a security vulnerability in Github.com/kyverno/kyverno involving Kyverno's PolicyException objects can be created in any namespace by default under CWE-285: Improper Authorization.
Which Github.com/kyverno/kyverno versions are affected?
Affected versions include releases prior to 1.13.0 across affected packages: github.com/kyverno/kyverno.
What version fixes CVE-2024-48921?
Upgrading to 1.13.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/kyverno/kyverno affected?
Yes, github.com/kyverno/kyverno is affected in releases prior to 1.13.0. Upgrade your dependency to 1.13.0 or later.
What is the CVSS score of CVE-2024-48921?
CVE-2024-48921 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
What CWE is associated with CVE-2024-48921?
CVE-2024-48921 is classified under CWE-285: Improper Authorization (The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action.).
How can I check Go dependencies for CVE-2024-48921?
Run the dependency tree command: 'inspect dependencies for github.com/kyverno/kyverno'. 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-qjvc-p88j-j9rm",
  "modified" : "2024-11-07T19:23:10Z",
  "published" : "2024-10-29T14:44:36Z",
  "aliases" : [ "CVE-2024-48921" ],
  "summary" : "Kyverno's PolicyException objects can be created in any namespace by default",
  "details" : "### Summary\nA kyverno ClusterPolicy, ie. \"disallow-privileged-containers,\" can be overridden by the creation of a PolicyException in a random namespace.\n\n### Details\nBy design, PolicyExceptions are consumed from any namespace. Administrators may not recognize that this allows users with privileges to non-kyverno namespaces to create exceptions.\n\n### PoC\n1. Administrator creates \"disallow-privileged-containers\" ClusterPolicy that applies to resources in the namespace \"ubuntu-restricted\"\n2. Cluster user creates a PolicyException object for \"disallow-privileged-containers\" in namespace \"ubuntu-restricted\"\n3. Cluster user creates a pod with a privileged container in \"ubuntu-restricted\" \n4. Cluster user escalates to root on the node from the privileged container\n\n### Impact\nAdministrators attempting to enforce cluster security through kyverno policies, but that allow less privileged users to create resources",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/kyverno/kyverno"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.13.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/kyverno/kyverno/security/advisories/GHSA-qjvc-p88j-j9rm"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2024-48921"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/kyverno/kyverno"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-285", "CWE-863" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-10-29T14:44:36Z",
    "nvd_published_at" : "2024-10-29T15:15:10Z"
  }
}