MIT Kerberos LDAP denial of service

kerberos-ldap-dos (65323) The risk level is classified as MediumMedium Risk

Description:

MIT Kerberos is vulnerable to a denial of service, caused by a NULL pointer dereference in the Key Distribution Center (KDC) daemon when configured with an LDAP back end. An attacker could exploit this vulnerability to cause the daemon to crash.

*CVSS:

Base Score: 5
  Access Vector: Network
  Access Complexity: Low
  Authentication: None
  Confidentiality Impact: None
  Integrity Impact: None
  Availability Impact: Partial
 
Temporal Score: 3.7
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Denial of Service

Remedy:

Refer to MITKRB5-SA-2011-002 for patch, upgrade or suggested workaround information. See References.

References:

  • MITKRB5-SA-2011-002: KDC denial of service attacks.
  • BID-46271: MIT Kerberos KDC Principal Name LDAP Request NULL Pointer Denial Of Service Vulnerability
  • CVE-2011-0282: The Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) 1.6.x through 1.9, when an LDAP backend is used, allows remote attackers to cause a denial of service (NULL pointer dereference or buffer over-read, and daemon crash) via a crafted principal name.
  • OSVDB ID: 70909: MIT Kerberos 5 Key Distribution Center (KDC) LDAP Backend Principal Name Handling DoS
  • RHSA-2011-0199: Important: krb5 security update
  • RHSA-2011-0200: Important: krb5 security update
  • SA43260: Kerberos Multiple Denial of Service Vulnerabilities
  • SA44284: Oracle Solaris Kerberos Multiple Vulnerabilities
  • SA46397: VMware ESX / ESXi Server Multiple Vulnerabilities
  • SUSE-SR:2011:004: SUSE Security Summary Report

Platforms Affected:

  • MIT Kerberos 5-1.6
  • MIT Kerberos 5-1.7
  • MIT Kerberos 5-1.8
  • MIT Kerberos 5-1.9
  • RedHat Enterprise Linux 5 Client Workstation
  • RedHat Enterprise Linux 5
  • RedHat Enterprise Linux 5 Client
  • RedHat Enterprise Linux 6 Server
  • RedHat Enterprise Linux 6 Workstation
  • RedHat Enterprise Linux Desktop 6
  • RedHat Enterprise Linux EUS 5.6.z
  • RedHat Enterprise Linux HPC Node 6
  • RedHat Enterprise Linux Long Life 5.6
  • RedHat Enterprise Linux Server EUS 6.0.z

Reported:

Feb 08, 2011

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The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

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