Vulnerability-Lookup

GHSA-5WJ4-WFFQ-3378

Vulnerability from github – Published: 2023-10-25 21:30 – Updated: 2025-02-13 19:18

Summary

Ingress nginx annotation injection causes arbitrary command execution

Details

Issue Details

A security issue was identified in ingress-nginx where the nginx.ingress.kubernetes.io/configuration-snippet annotation on an Ingress object (in the networking.k8s.io or extensions API group) can be used to inject arbitrary commands, and obtain the credentials of the ingress-nginx controller. In the default configuration, that credential has access to all secrets in the cluster.

This issue has been rated High (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L), and assigned CVE-2023-5043.

Affected Components and Configurations

This bug affects ingress-nginx. If you do not have ingress-nginx installed on your cluster, you are not affected. You can check this by running kubectl get po -n ingress-nginx.

If you are running the “chrooted” ingress-nginx controller introduced in v1.2.0 (gcr.io/k8s-staging-ingress-nginx/controller-chroot), command execution is possible but credential extraction is not, so the High severity does not apply.

Multi-tenant environments where non-admin users have permissions to create Ingress objects are most affected by this issue.

Affected Versions

<v1.9.0

Versions allowing mitigation

v1.9.0

Mitigation

Ingress Administrators should set the --enable-annotation-validation flag to enforce restrictions on the contents of ingress-nginx annotation fields.

Detection

If you find evidence that this vulnerability has been exploited, please contact security@kubernetes.io

Additional Details

See ingress-nginx Issue #10571 for more details.

Acknowledgements

This vulnerability was reported by suanve

Thank You, CJ Cullen on behalf of the Kubernetes Security Response Committee

Severity

7.6 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "k8s.io/ingress-nginx"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.9.0"
            }
          ],
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        }
      ]
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  "aliases": [
    "CVE-2023-5043"
  ],
  "database_specific": {
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      "CWE-20",
      "CWE-74"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2023-11-03T19:13:55Z",
    "nvd_published_at": "2023-10-25T20:15:18Z",
    "severity": "HIGH"
  },
  "details": "### Issue Details\nA security issue was identified in ingress-nginx where the nginx.ingress.kubernetes.io/configuration-snippet annotation on an Ingress object (in the networking.k8s.io or extensions API group) can be used to inject arbitrary commands, and obtain the credentials of the ingress-nginx controller. In the default configuration, that credential has access to all secrets in the cluster.\n\nThis issue has been rated High (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L), and assigned CVE-2023-5043.\n\n### Affected Components and Configurations\nThis bug affects ingress-nginx. If you do not have ingress-nginx installed on your cluster, you are not affected. You can check this by running kubectl get po -n ingress-nginx.\n\nIf you are running the \u201cchrooted\u201d ingress-nginx controller introduced in v1.2.0 (gcr.io/k8s-staging-ingress-nginx/controller-chroot), command execution is possible but credential extraction is not, so the High severity does not apply.\n\nMulti-tenant environments where non-admin users have permissions to create Ingress objects are most affected by this issue.\n\n#### Affected Versions\n\u003cv1.9.0\n#### Versions allowing mitigation\nv1.9.0\n### Mitigation\nIngress Administrators should set the --enable-annotation-validation flag to enforce restrictions on the contents of ingress-nginx annotation fields.\n\n### Detection\nIf you find evidence that this vulnerability has been exploited, please contact security@kubernetes.io\n\n### Additional Details\nSee ingress-nginx Issue [#10571](https://github.com/kubernetes/ingress-nginx/issues/10571) for more details.\n\n### Acknowledgements\nThis vulnerability was reported by suanve\n\nThank You,\nCJ Cullen on behalf of the Kubernetes Security Response Committee",
  "id": "GHSA-5wj4-wffq-3378",
  "modified": "2025-02-13T19:18:20Z",
  "published": "2023-10-25T21:30:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-5043"
    },
    {
      "type": "WEB",
      "url": "https://github.com/kubernetes/ingress-nginx/issues/10571"
    },
    {
      "type": "WEB",
      "url": "https://groups.google.com/g/kubernetes-security-announce/c/pVsXsOpxYZo"
    },
    {
      "type": "WEB",
      "url": "https://security.netapp.com/advisory/ntap-20240307-0012"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2023/10/25/4"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Ingress nginx annotation injection causes arbitrary command execution"
}

CVE-2023-5043 (GCVE-0-2023-5043)

Vulnerability from cvelistv5 – Published: 2023-10-25 19:18 – Updated: 2025-02-13 17:19

Title

Ingress nginx annotation injection causes arbitrary command execution

Summary

Ingress nginx annotation injection causes arbitrary command execution.

Severity

7.6 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L

CWE

CWE-20 - Improper Input Validation

Assigner

kubernetes mitre root

References

4 references

URL	Tags
https://github.com/kubernetes/ingress-nginx/issue…	issue-tracking
https://groups.google.com/g/kubernetes-security-a…	mailing-list
http://www.openwall.com/lists/oss-security/2023/10/25/4
https://security.netapp.com/advisory/ntap-2024030…

Impacted products

1 product

Vendor	Product	Version
Kubernetes	ingress-nginx	Affected: 0 , < 1.9.0 (semver) Unknown: 1.9.0

Date Public

2023-10-25 16:30

Credits

suanve

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

GHSA-5WJ4-WFFQ-3378

Issue Details

Affected Components and Configurations

Affected Versions

Versions allowing mitigation

Mitigation

Detection

Additional Details

Acknowledgements

CVE-2023-5043 (GCVE-0-2023-5043)

Tags

Sightings

Nomenclature

Related by attack behaviour