MIT Kerberos 5 KDC NULL pointer dereference denial of service

kerberos-kdc-null-pointer-dos (10099) The risk level is classified as MediumMedium Risk


The MIT Kerberos Key Distribution Center (KDC) in MIT Kerberos 5 is vulnerable to a denial of service attack, caused by a NULL pointer dereference that can occur under certain configurations. A remote attacker who has successfully authenticated to the KDC can cause the KDC to crash by sending a malformed request.


Base Score: 2.1
  Access Vector: Remote
  Access Complexity: Low
  Authentication: Required
  Confidentiality Impact: None
  Integrity Impact: None
  Availability Impact: Partial
Temporal Score: 1.6
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed


Denial of Service


Upgrade to the latest version of MIT Kerberos 5 (krb5-1.2.7 or later), available from the MIT Kerberos Web site. See References.

For Sun Solaris Enterprise Authentication Mechanism (SEAM) and Sun Solaris:
Apply the appropriate patch for your system, as listed below. Refer to Sun Alert ID: 50142 for more information. See References.

SEAM 1.0 for Solaris 2.6: 12534-02 or later
SEAM 1.0 for Solaris 7: 112536-02 or later
Solaris 8: 112237-07 (global) or later
Solaris 8: 112390-07 (domestic) or later
Solaris 9: 112908-04 or later

SEAM 1.0 for Solaris 2.6: 112535-02 or later
SEAM 1.0 for Solaris 7: 112537-03 or later
Solaris 8: 112238-06 (global) or later
Solaris 8: 112240-06 (domestic) or later

For Red Hat Linux:
Upgrade to the latest krb5 package, as listed below. Refer to RHSA-2003:051-30 for more information. See References.

Red Hat 6.2: 1.1.1-40 or later
Red Hat 7.0, 7.1, and 7.2: 1.2.2-24 or later
Red Hat 7.3: 1.2.4-11 or later
Red Hat 8.0: 1.2.5-15 or later

For Conectiva Linux 8.0:
Upgrade to the latest version of krb5 (1.2.8-1U80_1cl or later), as listed in Conectiva Linux Security Announcement CLSA-2003:639. See References.

For other distributions:
Contact your vendor for upgrade or patch information.


Platforms Affected:

  • Conectiva Linux 8.0
  • MandrakeSoft Mandrake Linux 8.2 PPC
  • MandrakeSoft Mandrake Linux 8.2
  • MandrakeSoft Mandrake Linux 9.0
  • MandrakeSoft Mandrake Linux 9.1 PPC
  • MandrakeSoft Mandrake Linux 9.1
  • MandrakeSoft Mandrake Linux Corporate Server 2.1
  • MandrakeSoft Mandrake Linux Corporate Server 2.1 X86_64
  • MandrakeSoft Mandrake Multi Network Firewall 8.2
  • MIT Kerberos 5-1.2.1
  • MIT Kerberos 5-1.2.2
  • MIT Kerberos 5-1.2.3
  • MIT Kerberos 5-1.2.4
  • RedHat Enterprise Linux 2.1 ES
  • RedHat Enterprise Linux 2.1 WS
  • RedHat Enterprise Linux 2.1 AS
  • RedHat Linux 6.2
  • RedHat Linux 7
  • RedHat Linux 7.1
  • RedHat Linux 7.1 for iSeries
  • RedHat Linux 7.1 for pSeries
  • RedHat Linux 7.2
  • RedHat Linux 7.3
  • RedHat Linux 8.0
  • RedHat Linux Advanced Workstation 2.1 Itanium
  • Sun SEAM 1.0
  • Sun Solaris 2.6
  • Sun Solaris 7.0
  • Sun Solaris 8
  • Sun Solaris 9


Sep 16, 2002

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 the author/distributor (IBM Internet Security Systems X-Force) 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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