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Category:   Application (Security)  >   Kerberos Vendors:   MIT
Kerberos kadmind SVCAUTH_DESTROY() Lets Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1017493
SecurityTracker URL:
CVE Reference:   CVE-2006-6143   (Links to External Site)
Date:  Jan 10 2007
Impact:   Execution of arbitrary code via network, Root access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 5-1.4 through 5-1.4.4, 5-1.5 through 5-1.5.1
Description:   A vulnerability was reported in Kerberos in kadmind. A remote user can execute arbitrary code on the target system.

A remote user can send specially crafted data to the SVCAUTH_DESTROY() function to access uninitialized memory and execute arbitrary code on the target system. The code will run with the privileges of the target kadmind service.

A remote user can also cause third-party server applications that use the RPC library to execute arbitrary code.

The vulnerability resides in 'src/lib/rpc/svc.c'

MIT credits Andrew Korty from Indiana University with reporting this vulnerability.

Impact:   A remote user can execute arbitrary code on the target system with the privileges of kadmind.
Solution:   The vendor has issued a patch, available at:

The vendor also plans to issue fixed versions (krb5-1.6, krb5-1.5.2).

The Kerberos advisory is available at:

Vendor URL: (Links to External Site)
Cause:   Access control error, State error
Underlying OS:  Linux (Any), UNIX (Any)

Message History:   None.

 Source Message Contents

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