CVE-2011-1529

krb5: KDC denial of service vulnerabilities (MITKRB5-SA-2011-006)

Severity Score

7.5

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

The lookup_lockout_policy function in the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) 1.8 through 1.8.4 and 1.9 through 1.9.1, when the db2 (aka Berkeley DB) or LDAP back end is used, allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via vectors that trigger certain process_as_req errors.

La function lookup_lockout_policy function del centro de distribución de claves (“Key Distribution Center” o KDC) en MIT Kerberos 5 (krb5) 1.8 hasta la version 1.8.4 y 1.9 hasta la 1.9.1, si db2 (Berkeley DB) o el back end LDAP es utilizado, permite a atacantes remotos provocar una denegación de servicio (resolución de puntero NULL y caída del demonio) a través de vectores que provocan determinados errores process_as_req.

The kdb_ldap plugin in the Key Distribution Center in MIT Kerberos 5 1.9 through 1.9.1, when the LDAP back end is used, allows remote attackers to cause a denial of service via a kinit operation with incorrect string case for the realm, related to the is_principal_in_realm, krb5_set_error_message, krb5_ldap_get_principal, and process_as_req functions. The krb5_ldap_lockout_audit function in the Key Distribution Center 1.8 through 1.8.4 and 1.9 through 1.9.1, when the LDAP back end is used, allows remote attackers to cause a denial of service via unspecified vectors, related to the locked_check_p function. The lookup_lockout_policy function in the Key Distribution Center in MIT Kerberos 5 1.8 through 1.8.4 and 1.9 through 1.9.1, when the db2 or LDAP back end is used, allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via vectors that trigger certain process_as_req errors. The updated packages have been patched to correct these issues.

*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

Complete

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

2011-03-29 CVE Reserved
2011-10-19 CVE Published
2024-08-06 CVE Updated
2025-04-03 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-20: Improper Input Validation

CAPEC

References (8)

URL	Tag	Source
http://www.kb.cert.org/vuls/id/659251	Third Party Advisory

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
http://lists.opensuse.org/opensuse-security-announce/2011-10/msg00009.html	2020-01-21
http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2011-006.txt	2020-01-21
http://www.mandriva.com/security/advisories?name=MDVSA-2011:159	2020-01-21
http://www.mandriva.com/security/advisories?name=MDVSA-2011:160	2020-01-21
http://www.redhat.com/support/errata/RHSA-2011-1379.html	2020-01-21
https://access.redhat.com/security/cve/CVE-2011-1529	2011-10-18
https://bugzilla.redhat.com/show_bug.cgi?id=737711	2011-10-18

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"				1.8 Search vendor "Mit" for product "Kerberos 5" and version "1.8"		-		Affected
Mit Search vendor "Mit"		Kerberos 5 Search vendor "Mit" for product "Kerberos 5"				1.8.1 Search vendor "Mit" for product "Kerberos 5" and version "1.8.1"		-		Affected
Mit Search vendor "Mit"		Kerberos 5 Search vendor "Mit" for product "Kerberos 5"				1.8.2 Search vendor "Mit" for product "Kerberos 5" and version "1.8.2"		-		Affected
Mit Search vendor "Mit"		Kerberos 5 Search vendor "Mit" for product "Kerberos 5"				1.8.3 Search vendor "Mit" for product "Kerberos 5" and version "1.8.3"		-		Affected
Mit Search vendor "Mit"		Kerberos 5 Search vendor "Mit" for product "Kerberos 5"				1.8.4 Search vendor "Mit" for product "Kerberos 5" and version "1.8.4"		-		Affected
Mit Search vendor "Mit"		Kerberos 5 Search vendor "Mit" for product "Kerberos 5"				1.9 Search vendor "Mit" for product "Kerberos 5" and version "1.9"		-		Affected
Mit Search vendor "Mit"		Kerberos 5 Search vendor "Mit" for product "Kerberos 5"				1.9.1 Search vendor "Mit" for product "Kerberos 5" and version "1.9.1"		-		Affected