Vulnerability-Lookup

CVE-2021-3429 (GCVE-0-2021-3429)

Vulnerability from cvelistv5 – Published: 2023-04-19 21:42 – Updated: 2025-02-05 14:44

Title

sensitive data exposure in cloud-init logs

Summary

When instructing cloud-init to set a random password for a new user account, versions before 21.2 would write that password to the world-readable log file /var/log/cloud-init-output.log. This could allow a local user to log in as another user.

Severity

5.5 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-02-05 14:43 UTC

CWE

CWE-532
CWE-532 - Insertion of Sensitive Information into Log File

Assigner

canonical CNA under the mitre root

CNA scorecard B 82/100 over 58 records in the last 180 days details

References

1 reference

URL	Tags
https://github.com/canonical/cloud-init/commit/b7…	patch

Impacted products

1 product

Vendor	Product	Version	CPE status
Canonical Ltd.	cloud-init	Affected: 0 , < 21.2 (semver)	guessed

Date Public

2021-03-26 00:00

Credits

Carl Pearson

Show details on NVD website

JSON

To clipboard

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SUSE-SU-2023:2164-1

Vulnerability from csaf_suse - Published: 2023-05-10 17:55 - Updated: 2026-09-20 15:04

Summary

Security update for cloud-init

Severity

Moderate

Scope

2 vulnerabilities in this advisory, including CVE-2021-3429.

CVE-2021-3429

5.5 (Medium)


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

Recommended: 96 products

Open the full advisory

UBUNTU-CVE-2021-3429 (CVE-2021-3429)

Vulnerability from osv_ubuntu – Published: 2023-04-19 22:15 – Updated: 2025-07-16 04:56 – Source website

Details

Severity

5.5 (Medium)


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

5.5 (Medium)


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

5.5 (Medium)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2021-3429	REPORT
	https://www.cve.org/CVERecord?id=CVE-2021-3429	REPORT

JSON

To clipboard

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            "binary_name": "cloud-init",
            "binary_version": "21.1-19-gbad84ad4-0ubuntu1~18.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "cloud-init",
        "purl": "pkg:deb/ubuntu/cloud-init@21.1-19-gbad84ad4-0ubuntu1~18.04.1?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "21.1-19-gbad84ad4-0ubuntu1~18.04.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "17.1-18-gd4f70470-0ubuntu1",
        "17.1-25-g17a15f9e-0ubuntu1~17.10.1",
        "17.1-25-g17a15f9e-0ubuntu1",
        "17.1-27-geb292c18-0ubuntu1",
        "17.1-41-g76243487-0ubuntu1",
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        "17.2-30-gf7deaf15-0ubuntu1",
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        "18.1-5-g40e77380-0ubuntu1",
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        "18.2-9-g49b562c9-0ubuntu1",
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        "18.2-27-g6ef92c98-0ubuntu1~18.04.1",
        "18.3-9-g2e62cb8a-0ubuntu1~18.04.2",
        "18.4-0ubuntu1~18.04.1",
        "18.5-21-g8ee294d5-0ubuntu1~18.04.1",
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        "20.4-0ubuntu1~18.04.2",
        "20.4.1-0ubuntu1~18.04.1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "cloud-init",
            "binary_version": "21.1-19-gbad84ad4-0ubuntu1~20.04.1"
          }
        ]
      },
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        "20.1-0ubuntu1",
        "20.1-5-g67c8e53c-0ubuntu1",
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        "20.1-10-g71af48df-0ubuntu1",
        "20.1-10-g71af48df-0ubuntu2",
        "20.1-10-g71af48df-0ubuntu3",
        "20.1-10-g71af48df-0ubuntu5",
        "20.2-45-g5f7825e2-0ubuntu1~20.04.1",
        "20.3-2-g371b392c-0ubuntu1~20.04.1",
        "20.4-0ubuntu1~20.04.1",
        "20.4-0ubuntu1~20.04.2",
        "20.4.1-0ubuntu1~20.04.1"
      ]
    }
  ],
  "aliases": [],
  "details": "When instructing cloud-init to set a random password for a new user account, versions before 21.2 would write that password to the world-readable log file /var/log/cloud-init-output.log. This could allow a local user to log in as another user.",
  "id": "UBUNTU-CVE-2021-3429",
  "modified": "2025-07-16T04:56:38Z",
  "published": "2023-04-19T22:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-3429"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-3429"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2021-3429"
  ]
}

WID-SEC-W-2025-0214

Vulnerability from csaf_certbund - Published: 2021-08-10 22:00 - Updated: 2025-01-29 23:00

Summary

Red Hat Enterprise Linux (cloud-init): Schwachstelle ermöglicht Offenlegung von Informationen

Severity

Mittel

Scope

1 vulnerability in this advisory, including CVE-2021-3429.

CVE-2021-3429

Es existiert eine Schwachstelle in Red Hat Enterprise Linux. Der Fehler besteht in der Komponente cloud-init aufgrund eines im Klartext geschriebenen Passworts, wenn das Modul "Set Passwords" mit der Direktive "chpasswd" und "RANDOM" verwendet wird. Ein lokaler Angreifer kann diese Schwachstelle ausnutzen, um vertrauliche Informationen offenzulegen und sich möglicherweise als ein anderer Benutzer anzumelden.

Known affected: 3 products

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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.

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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

CVE-2021-3429 (GCVE-0-2021-3429)

SUSE-SU-2023:2164-1

UBUNTU-CVE-2021-3429 (CVE-2021-3429)

WID-SEC-W-2025-0214

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