Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2016-3120

Severity CVSS v4.0:
Pending analysis
Type:
CWE-476 NULL Pointer Dereference
Publication date:
01/08/2016
Last modified:
12/04/2025

Description

The validate_as_request function in kdc_util.c in the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.13.6 and 1.4.x before 1.14.3, when restrict_anonymous_to_tgt is enabled, uses an incorrect client data structure, which allows remote authenticated users to cause a denial of service (NULL pointer dereference and daemon crash) via an S4U2Self request.

Impact

Vector 3.x
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 6.50 MEDIUM
Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

Base Score 3.x
6.50
Severity 3.x
MEDIUM
Vector 2.0
AV:N/AC:L/Au:S/C:N/I:N/A:P CVSS v2.0 Severity and Metrics:

Base Score: 4.00 MEDIUM
Vector: AV:N/AC:L/Au:S/C:N/I:N/A:P

Attack Vector (AV): Network
Attack Complexity (AC): Low
Authentication (Au): Single
Confidentiality (C): None
Integrity (I): None
Availability (A): Physical

Base Score 2.0
4.00
Severity 2.0
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:a:mit:kerberos_5:1.13:*:*:*:*:*:*:*
cpe:2.3:a:mit:kerberos_5:1.13.1:*:*:*:*:*:*:*
cpe:2.3:a:mit:kerberos_5:1.13.2:*:*:*:*:*:*:*
cpe:2.3:a:mit:kerberos_5:1.13.3:*:*:*:*:*:*:*
cpe:2.3:a:mit:kerberos_5:1.13.4:*:*:*:*:*:*:*
cpe:2.3:a:mit:kerberos_5:1.13.5:*:*:*:*:*:*:*
cpe:2.3:a:mit:kerberos_5:1.13.6:*:*:*:*:*:*:*
cpe:2.3:a:mit:kerberos_5:1.14:*:*:*:*:*:*:*
cpe:2.3:a:mit:kerberos_5:1.14.1:*:*:*:*:*:*:*
cpe:2.3:a:mit:kerberos_5:1.14.2:*:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools