A Security Vulnerability in the Management of Solaris Kerberos (see kerberos(5)) may Lead to a User Denial of Service (DoS) Attack

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A security vulnerability in the management of Solaris Kerberos (see kerberos(5)) credential renewal:

1. Impact

A security vulnerability in the management of Solaris Kerberos (see kerberos(5)) credential renewal may allow a local unprivileged user to prevent other users from authenticating to the Kerberos server. This is a type of Denial of Service (DoS).

2. Contributing Factors

This issue can occur in the following releases:

SPARC Platform

• Solaris 8 without patch 109805-19
  
• Solaris 9 without patch 112908-33
• Solaris 10 without patch 139478-01
• Opensolaris based upon build snv_01 through snv_104

x86 Platform

• Solaris 8 without patch 109806-19
  
• Solaris 9 without patch 115168-18
• Solaris 10 without patch 139479-01
• Opensolaris based upon build snv_01 through snv_104

Note 1: This issue could affect all kerberized users.  To determine if your system is configured for Kerberos, run the following command:

    % grep default_realm /etc/krb5/krb5.conf

If the above command returns the following data, then your system is NOT  configured for Kerberos:

    #    default_realm = ___default_realm___
    #    ___default_realm___ = {
    #    ___domainname___ = ___default_realm___

Note 2:  OpenSolaris distributions may include additional bug fixes above and beyond the build from which it was derived. To determine the base build of  OpenSolaris, the following command can be used:

    $ uname -v
    snv_86

3. Symptoms

This issue exists on all systems utilizing Kerberos. If the described issue occurs, the following error message will be seen:

    Credentials cache file permissions incorrect when initializing cache

4. Workaround

There is no workaround for this issue.  Please see the Resolution section below.

5. Resolution

This issue is addressed in the following releases:

SPARC Platform

• Solaris 8 with patch 109805-19 or later
  
• Solaris 9 with patch 112908-33 or later
  
• Solaris 10 with patch 139478-01 or later
  
• Opensolaris based upon build snv_105 or later

x86 Platform

• Solaris 8 without patch 109806-19 or later
  
• Solaris 9 without patch 115168-18 or later
  
• Solaris 10 without patch 139479-01 or later
  
• Opensolaris based upon build snv_105 or later

For more information on Security Sun Alerts, see Technical Instruction ID 213557.

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