Vulnerability-Lookup

GHSA-VJHP-527W-C5VJ

Vulnerability from github – Published: 2023-06-22 18:30 – Updated: 2024-04-04 05:01

Details

pam_krb5 authenticates a user by essentially running kinit with the password, getting a ticket-granting ticket (tgt) from the Kerberos KDC (Key Distribution Center) over the network, as a way to verify the password. However, if a keytab is not provisioned on the system, pam_krb5 has no way to validate the response from the KDC, and essentially trusts the tgt provided over the network as being valid. In a non-default FreeBSD installation that leverages pam_krb5 for authentication and does not have a keytab provisioned, an attacker that is able to control both the password and the KDC responses can return a valid tgt, allowing authentication to occur for any user on the system.

Severity ?

9.8 (Critical)


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

Show details on source website

JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2023-3326"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-287",
      "CWE-303"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2023-06-22T17:15:44Z",
    "severity": "CRITICAL"
  },
  "details": "pam_krb5 authenticates a user by essentially running kinit with the password, getting a ticket-granting ticket (tgt) from the Kerberos KDC (Key Distribution Center) over the network, as a way to verify the password. However, if a keytab is not provisioned on the system, pam_krb5 has no way to validate the response from the KDC, and essentially trusts the tgt provided over the network as being valid. In a non-default FreeBSD installation that leverages pam_krb5 for authentication and does not have a keytab provisioned, an attacker that is able to control both the password and the KDC responses can return a valid tgt, allowing authentication to occur for any user on the system.\n",
  "id": "GHSA-vjhp-527w-c5vj",
  "modified": "2024-04-04T05:01:18Z",
  "published": "2023-06-22T18:30:25Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-3326"
    },
    {
      "type": "WEB",
      "url": "https://security.FreeBSD.org/advisories/FreeBSD-SA-23:04.pam_krb5.asc"
    },
    {
      "type": "WEB",
      "url": "https://security.FreeBSD.org/advisories/FreeBSD-SA-23:09.pam_krb5.asc"
    },
    {
      "type": "WEB",
      "url": "https://security.netapp.com/advisory/ntap-20230714-0005"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2023-3326 (GCVE-0-2023-3326)

Vulnerability from cvelistv5 – Published: 2023-06-22 16:37 – Updated: 2024-12-05 17:45

Title

Network authentication attack via pam_krb5

Summary

Severity ?

No CVSS data available.

CWE

CWE-303 - Incorrect Implementation of Authentication Algorithm

Assigner

freebsd

References

URL

Tags

	https://security.FreeBSD.org/advisories/FreeBSD-S…	vendor-advisory
	https://security.netapp.com/advisory/ntap-2023071…	third-party-advisory
	https://security.FreeBSD.org/advisories/FreeBSD-S…	vendor-advisory

Impacted products

	Vendor	Product	Version
	FreeBSD	FreeBSD	Affected: 13.2-RELEASE , < 13.2-RELEASE-p1 (release) Affected: 13.1-RELEASE , < 13.1-RELEASE-p8 (release) Affected: 12.4-RELEASE , < 12.4-RELEASE-p3 (release)

Credits

Taylor R Campbell <riastradh@NetBSD.org>

Show details on NVD website

JSON

To clipboard

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        "references": [
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            "tags": [
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            ],
            "url": "https://security.FreeBSD.org/advisories/FreeBSD-SA-23:04.pam_krb5.asc"
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            "tags": [
              "third-party-advisory",
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          },
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            "url": "https://security.FreeBSD.org/advisories/FreeBSD-SA-23:09.pam_krb5.asc"
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        ],
        "title": "CVE Program Container"
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        "metrics": [
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              "content": {
                "id": "CVE-2023-3326",
                "options": [
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                  {
                    "Automatable": "yes"
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                  {
                    "Technical Impact": "total"
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                "timestamp": "2024-12-05T17:45:11.407919Z",
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        "providerMetadata": {
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
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    ],
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      "affected": [
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          "modules": [
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      "configurations": [
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          "supportingMedia": [
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            }
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      "credits": [
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            }
          ],
          "value": "pam_krb5 authenticates a user by essentially running kinit with the password, getting a ticket-granting ticket (tgt) from the Kerberos KDC (Key Distribution Center) over the network, as a way to verify the password. However, if a keytab is not provisioned on the system, pam_krb5 has no way to validate the response from the KDC, and essentially trusts the tgt provided over the network as being valid. In a non-default FreeBSD installation that leverages pam_krb5 for authentication and does not have a keytab provisioned, an attacker that is able to control both the password and the KDC responses can return a valid tgt, allowing authentication to occur for any user on the system.\n"
        }
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      "impacts": [
        {
          "capecId": "CAPEC-114",
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      "providerMetadata": {
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        "discovery": "UNKNOWN"
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          "supportingMedia": [
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              "base64": false,
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              "value": "If you are not using Kerberos at all, ensure /etc/krb5.conf is missing from your system. Additionally, ensure pam_krb5 is commented out of your PAM configuration located as documented in pam.conf(5), generally /etc/pam.d. Note, the default FreeBSD PAM configuration has pam_krb5 commented out.\u003cbr\u003e\u003cbr\u003eIf you are using Kerberos, but not using pam_krb5, ensure pam_krb5 is commented out of your PAM configuration located as documented in pam.conf(5), generally /etc/pam.d. Note, the default FreeBSD PAM configuration has pam_krb5 commented out.\u003cbr\u003e\u003cbr\u003eIf you are using pam_krb5, ensure you have a keytab on your system as provided by your Kerberos administrator.\u003cbr\u003e"
            }
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  "cveMetadata": {
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}

Sightings

Author	Source	Type	Date

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.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-VJHP-527W-C5VJ

CVE-2023-3326 (GCVE-0-2023-3326)

Tags

Sightings

Nomenclature