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Category:   Application (Security)  >   Kerberos Vendors:   MIT
Kerberos KDC Null Pointer Dereference for Multi-Realm KDCs Lets Remote Users Deny Service
SecurityTracker Alert ID:  1029310
SecurityTracker URL:  http://securitytracker.com/id/1029310
CVE Reference:   CVE-2013-1418   (Links to External Site)
Date:  Nov 6 2013
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in Kerberos. A remote user can cause denial of service conditions.

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

KDCs configured to serve multiple realms are affected.

The vulnerability resides in the setup_server_realm() function in 'src/kdc/main.c'.

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

https://github.com/krb5/krb5/commit/c2ccf4197f697c4ff143b8a786acdd875e70a89d

The vendor's advisory is available at:

http://krbdev.mit.edu/rt/Ticket/Display.html?id=7757

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 27 2014 (Oracle Issues Fix for Solaris) Kerberos KDC Null Pointer Dereference for Multi-Realm KDCs Lets Remote Users Deny Service
Oracle has issued a fix for Solaris 10 and 11.1.
Sep 17 2014 (Red Hat Issues Fix) Kerberos KDC Null Pointer Dereference for Multi-Realm KDCs Lets Remote Users Deny Service
Red Hat has issued a fix for Red Hat Enterprise Linux 5.
Oct 14 2014 (Red Hat Issues Fix) Kerberos KDC Null Pointer Dereference for Multi-Realm KDCs Lets Remote Users Deny Service
Red Hat has issued a fix for Red Hat Enterprise Linux 6.



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