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Category:   Application (Security)  >   Kerberos Vendors:   MIT
Kerberos KDC Null Pointer Dereference Bugs Let Remote Users Deny Service
SecurityTracker Alert ID:  1026213
SecurityTracker URL:  http://securitytracker.com/id/1026213
CVE Reference:   CVE-2011-1527, CVE-2011-1528, CVE-2011-1529, CVE-2011-4151   (Links to External Site)
Updated:  Jan 23 2012
Original Entry Date:  Oct 19 2011
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): krb5-1.8, krb5-1.9
Description:   Three vulnerabilities were reported in Kerberos. A remote user can cause the target Key Distribution Center (KDC) to crash.

A remote user can send specially crafted data to trigger a null pointer dereference and cause the target KDC to crash.

One vulnerability resides in krb5_ldap_get_principal() in the KDC LDAP back end [CVE-2011-1527]. Nalin Dahyabhai, Andrej Ota, and Kyle Moffett independently reported this vulnerability.

One vulnerability resides in krb5_ldap_lockout_audit() and krb5_db2_lockout_audit() [CVE-2011-1528]. Mark Deneen reported this vulnerability.

One vulnerability resides in lookup_lockout_policy() [CVE-2011-1529].

One vulnerability resides in the Berkeley DB ('db2') back end [CVE-2011-4151].

Impact:   A remote user can cause the target KDC to crash.
Solution:   The vendor has issued a patch.

The patch will be included in an upcoming version.

The vendor's advisory is available at:

http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2011-006.txt

Vendor URL:  web.mit.edu/kerberos/advisories/MITKRB5-SA-2011-006.txt (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.
Oct 19 2011 (Red Hat Issues Fix) Kerberos KDC Null Pointer Dereference Bugs Let Remote Users Deny Service
Red Hat has issued a fix for Red Hat Enterprise Linux 6.
Jan 23 2012 (Gentoo Issues Fix) Kerberos KDC Null Pointer Dereference Bugs Let Remote Users Deny Service
Gentoo has issued a fix.
Jul 3 2013 (Oracle Issues Fix for Solaris) Kerberos KDC Null Pointer Dereference Bugs Let Remote Users Deny Service
Oracle has issued a fix for Solaris 11.1.



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