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Category:   Application (Security)  >   Kerberos Vendors:   MIT
MIT Kerberos Null Pointer Dereference Bugs Let Remote Authenticated Users Deny Service
SecurityTracker Alert ID:  1031376
SecurityTracker URL:  http://securitytracker.com/id/1031376
CVE Reference:   CVE-2014-5353, CVE-2014-5354   (Links to External Site)
Date:  Dec 16 2014
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  

Description:   Two vulnerabilities were reported in MIT Kerberos. A remote authenticated user can cause denial of service conditions.

A remote authenticated user with privileges to set password policy and add or modify principals can attempt to use a named ticket policy object as a password policy for a principal to trigger a null pointer dereference in krb5_ldap_get_password_policy_from_dn() and cause the target system to crash [CVE-2014-5353].

Systems with kadmind configured to use LDAP for the KDC database are affected.

Patrik Kis reported this vulnerability.

A remote authenticated user can insert a principal entry that contains no long-term keys into the database to trigger a null pointer dereference in krb5_add_ber_mem_ldap_mod() and cause the target system to crash [CVE-2014-5354]. Versions prior to 1.12 are not affected.

Impact:   A remote authenticated user can cause the target system to crash.
Solution:   The vendor has issued a source code fix, available at:

For CVE-2014-5353:

https://github.com/krb5/krb5/commit/d1f707024f1d0af6e54a18885322d70fa15ec4d3

For CVE-2014-5354:

https://github.com/krb5/krb5/commit/04038bf3633c4b909b5ded3072dc88c8c419bf16

Vendor URL:  web.mit.edu/kerberos/ (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Any), UNIX (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Feb 11 2015 (Ubuntu Issues Fix) MIT Kerberos Null Pointer Dereference Bugs Let Remote Authenticated Users Deny Service
Ubuntu has issued a fix for Ubuntu 10.04 LTS, 12.04 LTS, 14.04 LTS, and 14.10.
Mar 6 2015 (Red Hat Issues Fix) MIT Kerberos Null Pointer Dereference Bugs Let Remote Authenticated Users Deny Service
Red Hat has issued a fix for Red Hat Enterprise Linux 7.
Apr 9 2015 (Red Hat Issues Fix) MIT Kerberos Null Pointer Dereference Bugs Let Remote Authenticated Users Deny Service
Red Hat has issued a fix for Red Hat Enterprise Linux 6.
Apr 9 2015 (CentOS Issues Fix) MIT Kerberos Null Pointer Dereference Bugs Let Remote Authenticated Users Deny Service
CentOS has issued a fix for CentOS 6.
Jul 25 2015 (IBM Issues Fix for IBM Security Network Protection) MIT Kerberos Null Pointer Dereference Bugs Let Remote Authenticated Users Deny Service
IBM has issued a fix for IBM Security Network Protection.



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