MIT Kerberos 5 KDC NULL pointer dereference denial of service

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

Description:

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.

*CVSS:

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

Consequences:

Denial of Service

Remedy:

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.

SPARC:
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

Intel:
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.

References:

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

Reported:

Sep 16, 2002

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