Cisco IOS Software Multicast Network Time Protocol Denial of Service Vulnerability (cisco-sa-20130925-ntp)

This script is Copyright (C) 2013-2014 Tenable Network Security, Inc.


Synopsis :

The remote device is missing a vendor-supplied security patch.

Description :

A vulnerability in the implementation of the Network Time Protocol
(NTP) feature in Cisco IOS Software could allow an unauthenticated,
remote attacker to cause an affected device to reload, resulting in a
denial of service (DoS) condition. The vulnerability is due to the
improper handling of multicast NTP packets that are sent to an
affected device encapsulated in a Multicast Source Discovery Protocol
(MSDP) Source-Active (SA) message from a configured MSDP peer. An
attacker could exploit this vulnerability by sending multicast NTP
packets to an affected device. Repeated exploitation could result in a
sustained DoS condition. Cisco has released free software updates that
address this vulnerability. A workaround is available to mitigate this
vulnerability.

See also :

http://www.nessus.org/u?37c601ac

Solution :

Apply the relevant patch referenced in Cisco Security Advisory
cisco-sa-20130925-ntp.

Risk factor :

High / CVSS Base Score : 7.1
(CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:C)
CVSS Temporal Score : 6.2
(CVSS2#E:ND/RL:OF/RC:C)
Public Exploit Available : true

Family: CISCO

Nessus Plugin ID: 70322 ()

Bugtraq ID: 62640

CVE ID: CVE-2013-5472