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Category:   Application (Security)  >   Kerberos Vendors:   MIT
Kerberos KDC Null Pointer Dereference in validate_as_request() Lets Remote Authenticated Users Deny Service
SecurityTracker Alert ID:  1036442
SecurityTracker URL:  http://securitytracker.com/id/1036442
CVE Reference:   CVE-2016-3120   (Links to External Site)
Date:  Jul 26 2016
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  

Description:   A vulnerability was reported in Kerberos. A remote authenticated user can cause denial of service conditions on the target system.

On systems where anonymous client principals are restricted to obtaining ticket-granting tickets (TGTs) only, a remote authenticated user can send specially crafted data to trigger a null pointer dereference in validate_as_request() and cause the target KDC service to crash.

Impact:   A remote authenticated user can cause denial of service conditions on the target system.
Solution:   The vendor has issued a fix (5 Release 1.14.3).

The vendor's advisory is available at:

https://web.mit.edu/kerberos/krb5-1.14/

Vendor URL:  web.mit.edu/kerberos/krb5-1.14/ (Links to External Site)
Cause:   Access control error, State error
Underlying OS:  Linux (Any), UNIX (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Nov 4 2016 (Red Hat Issues Fix) Kerberos KDC Null Pointer Dereference in validate_as_request() Lets Remote Authenticated Users Deny Service
Red Hat has issued a fix for Red Hat Enterprise Linux 7.



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