CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
58.1%
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.
Vendor | Product | Version | CPE |
---|---|---|---|
freebsd | freebsd | * | cpe:2.3:o:freebsd:freebsd:*:*:*:*:*:*:*:* |
freebsd | freebsd | 12.4 | cpe:2.3:o:freebsd:freebsd:12.4:-:*:*:*:*:*:* |
freebsd | freebsd | 12.4 | cpe:2.3:o:freebsd:freebsd:12.4:p1:*:*:*:*:*:* |
freebsd | freebsd | 12.4 | cpe:2.3:o:freebsd:freebsd:12.4:p2:*:*:*:*:*:* |
freebsd | freebsd | 12.4 | cpe:2.3:o:freebsd:freebsd:12.4:rc2-p1:*:*:*:*:*:* |
freebsd | freebsd | 12.4 | cpe:2.3:o:freebsd:freebsd:12.4:rc2-p2:*:*:*:*:*:* |
freebsd | freebsd | 13.1 | cpe:2.3:o:freebsd:freebsd:13.1:-:*:*:*:*:*:* |
freebsd | freebsd | 13.1 | cpe:2.3:o:freebsd:freebsd:13.1:b1-p1:*:*:*:*:*:* |
freebsd | freebsd | 13.1 | cpe:2.3:o:freebsd:freebsd:13.1:b2-p2:*:*:*:*:*:* |
freebsd | freebsd | 13.1 | cpe:2.3:o:freebsd:freebsd:13.1:p1:*:*:*:*:*:* |
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
58.1%