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Category:   Application (Generic)  >   ntp Vendors:   ntp.org
(Ubuntu Issues Fix) ntp Multiple Bugs Let Remote Users Modify Parameters and Deny Service
SecurityTracker Alert ID:  1036965
SecurityTracker URL:  http://securitytracker.com/id/1036965
CVE Reference:   CVE-2016-4954, CVE-2016-4955, CVE-2016-4956   (Links to External Site)
Date:  Oct 6 2016
Impact:   Denial of service via network, Modification of system information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 4.2.8p8
Description:   Multiple vulnerabilities were reported in ntp. A remote user can cause denial of service conditions on the target system. A remote user can modify configuration parameters in certain cases.

A remote user can send a specially crafted spoofed packet containing an invalid MAC to the target system to demobilize its ephemeral association [CVE-2016-4953].

A remote user can send specially crafted spoofed packets to bypass some validation checks in the receive() function and be processed by the process_packet() function in 'ntp_proto.c' [CVE-2016-4954]. In some cases, the remote user may be able to modify certain peer variables on the target system.

A remote user can send a specially crafted spoofed packet with an invalid MAC or crypto-NAK to the target system to reset its association and potentially prevent the association from working [CVE-2016-4955]. Systems using autokey for authentication are affected.

A remote user can send specially crafted data to cause a target broadcast client to switch to interleave mode and cause the client synchronization to become disabled [CVE-2016-4956].

A remote user can send a specially crafted crypto-NAK packet to the target system to trigger a null pointer dereference and cause the ntpd process to crash [CVE-2016-4957].

Jakub Prokes of Red Hat Quality Engineering, Miroslav Lichvar of Red Hat, and Nicolas Edet of Cisco reported these vulnerabilities.

Impact:   A remote user can modify configuration parameters in certain cases.

A remote user can cause denial of service conditions, including crashing the daemon, destabilizing ephemeral associations, and disabling synchronization.

Solution:   Ubuntu has issued a fix for CVE-2016-4954, CVE-2016-4955, and CVE-2016-4956.

The Ubuntu advisory is available at:

http://www.ubuntu.com/usn/usn-3096-1

Vendor URL:  www.ubuntu.com/usn/usn-3096-1 (Links to External Site)
Cause:   Access control error, Input validation error, State error
Underlying OS:  Linux (Ubuntu)
Underlying OS Comments:  12.04 LTS, 14.04 LTS, 16.04 LTS

Message History:   This archive entry is a follow-up to the message listed below.
Jun 6 2016 ntp Multiple Bugs Let Remote Users Modify Parameters and Deny Service



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