CVE-2012-1016

krb5: PKINIT null pointer deref leads to DoS

Severity Score

7.5

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

The pkinit_server_return_padata function in plugins/preauth/pkinit/pkinit_srv.c in the PKINIT implementation in the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.10.4 attempts to find an agility KDF identifier in inappropriate circumstances, which allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via a crafted Draft 9 request.

La función pkinit_server_return_padata en plugins/preauth/pkinit/pkinit_srv.c en la implementación PKINIT en el Key Distribution Center (KDC) en MIT Kerberos 5 (también conocido como krb5) anterior a v1.10.4 intenta encontrar un identificador KDF en circunstancias inapropiadas, lo que permite a atacantes remotos provocar una denegación de servicio (referencia a puntero NULL y caída del servicio) a través de una solicitud Draft especialmente diseñada.

Kerberos is a network authentication system which allows clients and servers to authenticate to each other using symmetric encryption and a trusted third-party, the Key Distribution Center. When a client attempts to use PKINIT to obtain credentials from the KDC, the client can specify, using an issuer and serial number, which of the KDC's possibly-many certificates the client has in its possession, as a hint to the KDC that it should use the corresponding key to sign its response. If that specification was malformed, the KDC could attempt to dereference a NULL pointer and crash.

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2012-02-07 CVE Reserved
2013-03-03 CVE Published
2024-08-06 CVE Updated
2025-03-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-476: NULL Pointer Dereference

CAPEC

References (6)

URL	Tag	Source
http://secunia.com/advisories/55040	Third Party Advisory

URL	Date	SRC

URL	Date	SRC
https://github.com/krb5/krb5/commit/db64ca25d661a47b996b4e2645998b5d7f0eb52c	2021-02-02

URL	Date	SRC
http://krbdev.mit.edu/rt/Ticket/Display.html?id=7527	2021-02-02
http://web.mit.edu/kerberos/www/krb5-1.10	2021-02-02
https://access.redhat.com/security/cve/CVE-2012-1016	2013-03-18
https://bugzilla.redhat.com/show_bug.cgi?id=917840	2013-03-18

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Mit Search vendor "Mit"		Kerberos 5 Search vendor "Mit" for product "Kerberos 5"				< 1.10.4 Search vendor "Mit" for product "Kerberos 5" and version " < 1.10.4"		-		Affected