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Category:   Application (Security)  >   Kerberos Vendors:   MIT
(Gentoo Issues Fix) Kerberos KDC Null Pointer Dereference Bugs Let Remote Users Deny Service
SecurityTracker Alert ID:  1026557
SecurityTracker URL:  http://securitytracker.com/id/1026557
CVE Reference:   CVE-2011-1527, CVE-2011-1528, CVE-2011-1529, CVE-2011-4151   (Links to External Site)
Date:  Jan 23 2012
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:   Gentoo has issued a fix.

The Gentoo advisory is available at:

http://security.gentoo.org/glsa/glsa-201201-13.xml

Vendor URL:  web.mit.edu/kerberos/advisories/MITKRB5-SA-2011-006.txt (Links to External Site)
Cause:   Access control error
Underlying OS:   Linux (Gentoo)

Message History:   This archive entry is a follow-up to the message listed below.
Oct 19 2011 Kerberos KDC Null Pointer Dereference Bugs Let Remote Users Deny Service



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