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

Vulnerability from cvelistv5 – Published: 2023-06-22 16:37 – Updated: 2024-12-05 17:45
VLAI
Title
Network authentication attack via pam_krb5
Summary
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
No CVSS data available.
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-12-05 17:45 UTC
CWE
  • CWE-303 - Incorrect Implementation of Authentication Algorithm
Assigner
freebsd CNA under the mitre root
CNA scorecard D 60/100 over 69 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
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)
guessed Create a notification for this product.
Date Public
2023-06-21 06:00
Credits
Taylor R Campbell <riastradh@NetBSD.org>
Show details on NVD website
To clipboard 

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                  "version": "12.4-RELEASE",
                  "versionType": "release"
                }
              ]
            }
          ],
          "configurations": [
            {
              "lang": "en",
              "supportingMedia": [
                {
                  "base64": false,
                  "type": "text/html",
                  "value": "\u003cdiv\u003eExposure only occurs if pam_krb5 is enabled in the PAM configuration, an /etc/krb5.conf is installed, and the system does not have a system keytab.\u003c/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c/div\u003e\u003cdiv\u003eFor FreeBSD, the default installation has pam_krb5 commented out and does not have an /etc/krb5.conf.\u003c/div\u003e"
                }
              ],
              "value": "Exposure only occurs if pam_krb5 is enabled in the PAM configuration, an /etc/krb5.conf is installed, and the system does not have a system keytab.\n\n\n\n\nFor FreeBSD, the default installation has pam_krb5 commented out and does not have an /etc/krb5.conf.\n\n"
            }
          ],
          "credits": [
            {
              "lang": "en",
              "type": "finder",
              "user": "00000000-0000-4000-9000-000000000000",
              "value": "Taylor R Campbell \u003criastradh@NetBSD.org\u003e"
            }
          ],
          "datePublic": "2023-06-21T06:00:00.000Z",
          "descriptions": [
            {
              "lang": "en",
              "supportingMedia": [
                {
                  "base64": false,
                  "type": "text/html",
                  "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.\u003cbr\u003e"
                }
              ],
              "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"
            }
          ],
          "impacts": [
            {
              "capecId": "CAPEC-114",
              "descriptions": [
                {
                  "lang": "en",
                  "value": "CAPEC-114 Authentication Abuse"
                }
              ]
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-303",
                  "description": "CWE-303  Incorrect Implementation of Authentication Algorithm",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2023-08-01T22:40:58.267Z",
            "orgId": "63664ac6-956c-4cba-a5d0-f46076e16109",
            "shortName": "freebsd"
          },
          "references": [
            {
              "tags": [
                "vendor-advisory"
              ],
              "url": "https://security.FreeBSD.org/advisories/FreeBSD-SA-23:04.pam_krb5.asc"
            },
            {
              "tags": [
                "third-party-advisory"
              ],
              "url": "https://security.netapp.com/advisory/ntap-20230714-0005/"
            },
            {
              "tags": [
                "vendor-advisory"
              ],
              "url": "https://security.FreeBSD.org/advisories/FreeBSD-SA-23:09.pam_krb5.asc"
            }
          ],
          "source": {
            "advisory": "FreeBSD-SA-23:04.pam_krb5",
            "discovery": "UNKNOWN"
          },
          "title": "Network authentication attack via pam_krb5",
          "workarounds": [
            {
              "lang": "en",
              "supportingMedia": [
                {
                  "base64": false,
                  "type": "text/html",
                  "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"
                }
              ],
              "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.\n\nIf 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.\n\nIf you are using pam_krb5, ensure you have a keytab on your system as provided by your Kerberos administrator.\n"
            }
          ],
          "x_generator": {
            "engine": "Vulnogram 0.1.0-dev"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "63664ac6-956c-4cba-a5d0-f46076e16109",
        "assignerShortName": "freebsd",
        "cveId": "CVE-2023-3326",
        "datePublished": "2023-06-22T16:37:51.360Z",
        "dateReserved": "2023-06-19T16:14:36.133Z",
        "dateUpdated": "2024-12-05T17:45:19.729Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}



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