CVE-2023-3326

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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.<br>"}], "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": {"orgId": "63664ac6-956c-4cba-a5d0-f46076e16109", "shortName": "freebsd", "dateUpdated": "2023-08-01T22:40:58.267Z"}, "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.<br><br>If 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.<br><br>If you are using pam_krb5, ensure you have a keytab on your system as provided by your Kerberos administrator.<br>"}], "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"}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T06:55:03.226Z"}, "title": "CVE Program Container", "references": [{"tags": ["vendor-advisory", "x_transferred"], "url": "https://security.FreeBSD.org/advisories/FreeBSD-SA-23:04.pam_krb5.asc"}, {"tags": ["third-party-advisory", "x_transferred"], "url": "https://security.netapp.com/advisory/ntap-20230714-0005/"}, {"tags": ["vendor-advisory", "x_transferred"], "url": "https://security.FreeBSD.org/advisories/FreeBSD-SA-23:09.pam_krb5.asc"}]}, {"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2024-12-05T17:45:11.407919Z", "id": "CVE-2023-3326", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-12-05T17:45:19.729Z"}}]}}

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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", "supportingMedia": [{"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.<br><br>If 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.<br><br>If you are using pam_krb5, ensure you have a keytab on your system as provided by your Kerberos administrator.<br>", "base64": false}]}], "x_generator": {"engine": "Vulnogram 0.1.0-dev"}, "descriptions": [{"lang": "en", "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", "supportingMedia": [{"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.<br>", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-303", "description": "CWE-303 Incorrect Implementation of Authentication Algorithm"}]}], "configurations": [{"lang": "en", "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", "supportingMedia": [{"type": "text/html", "value": "<div>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.</div><div><br></div><div>For FreeBSD, the default installation has pam_krb5 commented out and does not have an /etc/krb5.conf.</div>", "base64": false}]}], "providerMetadata": {"orgId": "63664ac6-956c-4cba-a5d0-f46076e16109", "shortName": "freebsd", "dateUpdated": "2023-08-01T22:40:58.267Z"}}}, "cveMetadata": {"cveId": "CVE-2023-3326", "state": "PUBLISHED", "dateUpdated": "2024-12-05T17:45:19.729Z", "dateReserved": "2023-06-19T16:14:36.133Z", "assignerOrgId": "63664ac6-956c-4cba-a5d0-f46076e16109", "datePublished": "2023-06-22T16:37:51.360Z", "assignerShortName": "freebsd"}, "dataVersion": "5.1"}

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