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Category:   Application (Generic)  >   ntp Vendors:   ntp.org
ntp Multiple Bugs Let Remote Users Modify Parameters and Deny Service
SecurityTracker Alert ID:  1036037
SecurityTracker URL:  http://securitytracker.com/id/1036037
CVE Reference:   CVE-2016-4953, CVE-2016-4954, CVE-2016-4955, CVE-2016-4956, CVE-2016-4957   (Links to External Site)
Date:  Jun 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:   The vendor has issued a fix (ntp-4.2.8p8).

The vendor's advisory is available at:

http://support.ntp.org/bin/view/Main/SecurityNotice#June_2016_ntp_4_2_8p8_NTP_Securi

Vendor URL:  support.ntp.org/bin/view/Main/SecurityNotice#June_2016_ntp_4_2_8p8_NTP_Securi (Links to External Site)
Cause:   Access control error, Input validation error, State error
Underlying OS:  Linux (Any), UNIX (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Jun 6 2016 (FreeBSD Issues Fix) ntp Multiple Bugs Let Remote Users Modify Parameters and Deny Service
FreeBSD has issued a fix for FreeBSD 9.3, 10.1, 10.2, and 10.3.
Jun 7 2016 (Cisco Issues Advisory for Cisco ASA) ntp Multiple Bugs Let Remote Users Modify Parameters and Deny Service
Cisco has issued an advisory for Cisco ASA CX.
Jun 8 2016 (Cisco Issues Advisory for Cisco IOS/IOS XE) ntp Multiple Bugs Let Remote Users Modify Parameters and Deny Service
Cisco has issued an advisory for Cisco IOS and IOS XE.
Jun 8 2016 (Cisco Issues Advisory for Cisco Prime Security Manager) ntp Multiple Bugs Let Remote Users Modify Parameters and Deny Service
Cisco has issued an advisory for Cisco Prime Security Manager.
Jun 9 2016 (Cisco Issues Advisory for Cisco Jabber Guest) ntp Multiple Bugs Let Remote Users Modify Parameters and Deny Service
Cisco has issued an advisory for Cisco Jabber Guest.
Jun 9 2016 (Cisco Issues Advisory for Cisco FireSIGHT) ntp Multiple Bugs Let Remote Users Modify Parameters and Deny Service
Cisco has issued an advisory for Cisco FireSIGHT.
Jun 9 2016 (Cisco Issues Advisory for Cisco Intrusion Prevention System) ntp Multiple Bugs Let Remote Users Modify Parameters and Deny Service
Cisco has issued an advisory for Cisco Intrusion Prevention System.
Jun 9 2016 (Cisco Issues Advisory for Cisco Email Security Appliance) ntp Multiple Bugs Let Remote Users Modify Parameters and Deny Service
Cisco has issued an advisory for Cisco Email Security Appliance (IronPort).
Jun 9 2016 (Cisco Issues Advisory for Cisco Prime Collaboration Assurance) ntp Multiple Bugs Let Remote Users Modify Parameters and Deny Service
Cisco has issued an advisory for Cisco Prime Collaboration Assurance.
Sep 7 2016 (IBM Issues Fix for IBM AIX) ntp Multiple Bugs Let Remote Users Modify Parameters and Deny Service
IBM has issued a fix for IBM AIX 5.3, 6.1, 7.1, and 7.2.
Oct 6 2016 (Ubuntu Issues Fix) ntp Multiple Bugs Let Remote Users Modify Parameters and Deny Service
Ubuntu has issued a fix for Ubuntu Linux 12.04 LTS, 14.04 LTS, and 16.04 LTS.



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