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Category:   Device (Router/Bridge/Hub)  >   Cisco IOS Vendors:   Cisco
(Cisco Issues Advisory for Cisco IOS/IOS XE) ntp Multiple Bugs Let Remote Users Modify Parameters and Deny Service
SecurityTracker Alert ID:  1036051
SecurityTracker URL:  http://securitytracker.com/id/1036051
CVE Reference:   CVE-2016-4953, CVE-2016-4954, CVE-2016-4955, CVE-2016-4956, CVE-2016-4957   (Links to External Site)
Updated:  Jun 8 2016
Original Entry Date:  Jun 8 2016
Impact:   Denial of service via network, Modification of system information
Vendor Confirmed:  Yes  

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. Cisco IOS and IOS XE is affected.

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:   No solution was available at the time of this entry for Cisco IOS and IOS XE.

The Cisco advisory is available at:

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160603-ntpd

Vendor URL:  tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160603-ntpd (Links to External Site)
Cause:   Access control error, Input validation error, State error

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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