CVE-2021-36222

krb5: Sending a request containing PA-ENCRYPTED-CHALLENGE padata element without using FAST could result in NULL dereference in KDC which leads to DoS

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

ec_verify in kdc/kdc_preauth_ec.c in the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.18.4 and 1.19.x before 1.19.2 allows remote attackers to cause a NULL pointer dereference and daemon crash. This occurs because a return value is not properly managed in a certain situation.

La función ec_verify en el archivo kdc/kdc_preauth_ec.c en el Centro de Distribución de Claves (KDC) en MIT Kerberos 5 (también se conoce como krb5) versiones anteriores a 1.18.4 y versiones 1.19.x anteriores a 1.19.2, permite a atacantes remotos causar una desreferencia de puntero NULL y un bloqueo del daemon. Esto ocurre porque un valor de retorno no es manejado apropiadamente en una situación determinada

A flaw was found in krb5. This flaw allows an unauthenticated attacker to cause a NULL dereference in the KDC by sending a request containing a PA-ENCRYPTED-CHALLENGE padata element without using FAST. The highest threat from this vulnerability is to system availability.

*Credits: N/A

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

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-07-07 CVE Reserved
2021-07-22 CVE Published
2024-08-04 CVE Updated
2024-10-23 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-476: NULL Pointer Dereference

CAPEC

References (9)

URL	Tag	Source
https://github.com/krb5/krb5/releases	Release Notes
https://security.netapp.com/advisory/ntap-20211022-0003	Third Party Advisory
https://security.netapp.com/advisory/ntap-20211104-0007	Third Party Advisory
https://web.mit.edu/kerberos/advisories	Not Applicable

URL	Date	SRC

URL	Date	SRC
https://github.com/krb5/krb5/commit/fc98f520caefff2e5ee9a0026fdf5109944b3562	2021-11-28
https://www.oracle.com/security-alerts/cpuoct2021.html	2021-11-28

URL	Date	SRC
https://www.debian.org/security/2021/dsa-4944	2021-11-28
https://access.redhat.com/security/cve/CVE-2021-36222	2021-09-21
https://bugzilla.redhat.com/show_bug.cgi?id=1983720	2021-09-21

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"				< 1.18.4 Search vendor "Mit" for product "Kerberos 5" and version " < 1.18.4"		-		Affected
Mit Search vendor "Mit"		Kerberos 5 Search vendor "Mit" for product "Kerberos 5"				>= 1.19.0 < 1.19.2 Search vendor "Mit" for product "Kerberos 5" and version " >= 1.19.0 < 1.19.2"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				10.0 Search vendor "Debian" for product "Debian Linux" and version "10.0"		-		Affected
Netapp Search vendor "Netapp"		Active Iq Unified Manager Search vendor "Netapp" for product "Active Iq Unified Manager"				-		vmware_vsphere		Affected
Netapp Search vendor "Netapp"		Active Iq Unified Manager Search vendor "Netapp" for product "Active Iq Unified Manager"				-		windows		Affected
Netapp Search vendor "Netapp"		Oncommand Insight Search vendor "Netapp" for product "Oncommand Insight"				-		-		Affected
Netapp Search vendor "Netapp"		Oncommand Workflow Automation Search vendor "Netapp" for product "Oncommand Workflow Automation"				-		-		Affected
Netapp Search vendor "Netapp"		Snapcenter Search vendor "Netapp" for product "Snapcenter"				-		-		Affected
Oracle Search vendor "Oracle"		Mysql Server Search vendor "Oracle" for product "Mysql Server"				>= 8.0.0 <= 8.0.26 Search vendor "Oracle" for product "Mysql Server" and version " >= 8.0.0 <= 8.0.26"		-		Affected