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.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2023-3326)

Note that Nessus relies on the presence of the package as reported by the vendor.

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the 9b0d9832-47c1-11ee-8e38-002590c1f29c advisory.

  - 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. (CVE-2023-3326)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the 41af0277-47bf-11ee-8e38-002590c1f29c advisory.

  - 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. (CVE-2023-3326)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
257377	Linux Distros Unpatched Vulnerability : CVE-2023-3326	Nessus	Misc.	critical
180348	FreeBSD : FreeBSD -- Network authentication attack via pam_krb5 (9b0d9832-47c1-11ee-8e38-002590c1f29c)	Nessus	FreeBSD Local Security Checks	critical
180345	FreeBSD : FreeBSD -- Network authentication attack via pam_krb5 (41af0277-47bf-11ee-8e38-002590c1f29c)	Nessus	FreeBSD Local Security Checks	critical

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CVE-2023-3326

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