Summary

• 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 software updates that address this vulnerability. A workaround is available to mitigate this vulnerability.
  
  This advisory is available at the following link: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130925-ntp
  

  Note: The September 25, 2013, Cisco IOS Software Security Advisory bundled publication includes eight Cisco Security Advisories. All advisories address vulnerabilities in Cisco IOS Software. Each Cisco IOS Software Security Advisory lists the Cisco IOS Software releases that correct the vulnerability or vulnerabilities detailed in the advisory as well as the Cisco IOS Software releases that correct all Cisco IOS Software vulnerabilities in the September 2013 bundled publication.

  Individual publication links are in "Cisco Event Response: Semiannual Cisco IOS Software Security Advisory Bundled Publication" at the following link:

  http://www.cisco.com/web/about/security/intelligence/Cisco_ERP_sep13.html

Affected Products

• Vulnerable Products

  A Cisco device that is running an affected Cisco IOS Software release is vulnerable when the following two conditions are met:
  

  • The device configuration includes any multicast NTP configuration commands
  • The device has has at least one MSDP peer configured

  The following steps can be used to determine whether the device meets the preceding conditions:
  
  The show running-config | include ^interface|ntp multicast privileged EXEC command can be used to determine whether the device configuration includes any multicast NTP configuration commands. The following is the output from the show running-config | include ^interface|ntp multicast command executed on a device running Cisco IOS Software that has multiple interfaces configured for multicast NTP:
  

  Router#show running-config | include ^interface|ntp multicast
  interface Loopback0
  interface Loopback1
  interface FastEthernet0/0
   ntp multicast
  interface FastEthernet0/1
  interface FastEthernet0/2
  interface FastEthernet0/3
  interface FastEthernet1/0
   ntp multicast key 61560
  interface FastEthernet1/1
  interface FastEthernet1/2
   ntp multicast client
  interface FastEthernet1/3
   ntp multicast client
   ntp multicast
  Router#

  Note: The next step can be skipped if the device does not have any multicast NTP commands in the configuration. The device is not vulnerable.
  
  The show ip msdp summary privileged EXEC command can be used to determine whether the device has at least one MSDP peer configured. The following is the output from the show ip msdp summary command executed on a device running Cisco IOS Software that has one MSDP peer configured:
  

  Router#show ip msdp summary 
  MSDP Peer Status Summary
  Peer Address     AS    State    Uptime/  Reset SA    Peer Name
                                  Downtime Count Count
  10.54.54.54      ?     Up       00:35:03 0     6     ?
  Router#
  

  A device without any MSDP peers configured is not vulnerable.
  
  The processing of NTP multicast packets is not enabled by default.
  
  

  To determine the Cisco IOS Software release that is running on a Cisco product, administrators can log in to the device and issue the show version command to display the system banner. The system banner confirms that the device is running Cisco IOS Software by displaying text similar to "Cisco Internetwork Operating System Software" or "Cisco IOS Software." The image name displays in parentheses, followed by "Version" and the Cisco IOS Software release name. Other Cisco devices do not have the show version command or may provide different output.

  The following example identifies a Cisco product that is running Cisco IOS Software Release 15.0(1)M1 with an installed image name of C3900-UNIVERSALK9-M:

  Router> show version 
  Cisco IOS Software, C3900 Software (C3900-UNIVERSALK9-M), Version 15.0(1)M1, RELEASE SOFTWARE (fc1)
  Technical Support: http://www.cisco.com/techsupport
  Copyright (c) 1986-2009 by Cisco Systems, Inc.
  Compiled Wed 02-Dec-09 17:17 by prod_rel_team

  !--- output truncated 

  Additional information about Cisco IOS Software release naming conventions is available in "White Paper: Cisco IOS and NX-OS Software Reference Guide" at http://www.cisco.com/web/about/security/intelligence/ios-ref.html.

  
  

  Products Confirmed Not Vulnerable

  The following products are confirmed not to be affected by this vulnerability:
  

  • Cisco IOS XR Software. 

  No other Cisco products are currently known to be affected by this vulnerability.

Details

• NTP is designed to time-synchronize a network of machines. NTP runs on UDP, which is transported on IP. Networking devices running NTP can be configured to operate in a variety of association modes when synchronizing time with reference time sources. A networking device can obtain time information on a network in two ways: by polling host servers and by listening to NTP broadcasts.
  
  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.
  
  This vulnerability has been documented in Cisco bug ID CSCuc81226 (registered customers only) and has been assigned the Common Vulnerabilities and Exposures (CVE) ID CVE-2013-5472

Workarounds

• Customers who do not require multicast NTP traffic from other multicast domains can configure an MSDP SA filter to drop the traffic coming from an MSDP peer and sent to the NTP multicast group. The following example shows an MSDP SA filter that will be applied to all MSDP traffic sent to the device from a configured MSDP peer with address 10.54.54.54
  

  access-list 111 remark -- Deny traffic from any source to the NTP multicast group
  access-list 111 deny ip any host 224.0.1.1
  access-list 111 remark -- Allow everything else
  access-list 111 permit ip any any
  
  ip msdp sa-filter in 10.54.54.54 list 111

  Note: the previous MSDP SA filter will need to be applied to each and every MSDP peer configured on the device, and should be customized according to the specific environment.
  
  Refer to http://www.cisco.com/en/US/tech/tk828/technologies_tech_note09186a0080093fda.shtml for additional information on MSDP SA filtering recommendations.
  

Fixed Software

• When considering software upgrades, customers are advised to consult the Cisco Security Advisories, Responses, and Notices archive at http://www.cisco.com/go/psirt and review subsequent advisories to determine exposure and a complete upgrade solution.

  In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers.

  
  

  Cisco IOS Software

  Each row of the following Cisco IOS Software table corresponds to a Cisco IOS Software train. If a particular train is vulnerable, the earliest releases that contain the fix are listed in the First Fixed Release column. The First Fixed Release for All Advisories in the September 2013 Bundled Publication column lists the earliest possible releases that correct all the published vulnerabilities in the Cisco IOS Software Security Advisory bundled publication. Cisco recommends upgrading to the latest available release where possible.

  The Cisco IOS Software Checker allows customers to search for Cisco Security Advisories that address specific Cisco IOS Software releases. This tool is available on the Cisco Security (SIO) portal at https://sec.cloudapps.cisco.com/security/center/selectIOSVersion.x

  
  

  Major Release	Availability of Repaired Releases
  Affected 12.0-Based Releases	First Fixed Release	First Fixed Release for All Advisories in the September 2013 Bundled Publication
  12.0S	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.0SY	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.0SZ	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  Affected 12.2-Based Releases	First Fixed Release	First Fixed Release for All Advisories in the September 2013 Bundled Publication
  12.2EX	Note: Releases prior to 12.2(58)EX are vulnerable; Releases 12.2(58)EX and later are not vulnerable.	Vulnerable; First fixed in Release 15.0SE
  12.2EY	Note: Releases prior to 12.2(58)EY are vulnerable; Releases 12.2(58)EY and later are not vulnerable.	Vulnerable; First fixed in Release 15.2S
  12.2EZ	Note: Releases prior to 12.2(58)EZ are vulnerable; Releases 12.2(58)EZ and later are not vulnerable.	Releases prior to 12.2(60)EZ2 are vulnerable; Releases 12.2(60)EZ2 and later are not vulnerable. First fixed in Release 15.0SE
  12.2IRB	Vulnerable; First fixed in Release 12.2SRE	Vulnerable; First fixed in Release 12.2SRE
  12.2IRC	Vulnerable; First fixed in Release 12.2SRE	Vulnerable; First fixed in Release 12.2SRE
  12.2IRD	Vulnerable; First fixed in Release 12.2SRE	Vulnerable; First fixed in Release 12.2SRE
  12.2IRE	Vulnerable; First fixed in Release 12.2SRE	Vulnerable; First fixed in Release 12.2SRE
  12.2IRF	Vulnerable; First fixed in Release 12.2SRE	Vulnerable; First fixed in Release 12.2SRE
  12.2IRG	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.2IRH	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.2IRI	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.2IXG	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.2IXH	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.2MC	Vulnerable; migrate to any release in 15.0M	Vulnerable; First fixed in Release 15.1M
  12.2MRA	Vulnerable; First fixed in Release 12.2SRE	Vulnerable; First fixed in Release 12.2SRE
  12.2MRB	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.2SB	12.2(33)SB15	12.2(33)SB15
  12.2SCA	Vulnerable; First fixed in Release 12.2SCH	Vulnerable; First fixed in Release 12.2SCH
  12.2SCB	Vulnerable; First fixed in Release 12.2SCH	Vulnerable; First fixed in Release 12.2SCH
  12.2SCC	Vulnerable; First fixed in Release 12.2SCH	Vulnerable; First fixed in Release 12.2SCH
  12.2SCD	Vulnerable; First fixed in Release 12.2SCH	Vulnerable; First fixed in Release 12.2SCH
  12.2SCE	Vulnerable; First fixed in Release 12.2SCH	Vulnerable; First fixed in Release 12.2SCH
  12.2SCF	Vulnerable; First fixed in Release 12.2SCH	Vulnerable; First fixed in Release 12.2SCH
  12.2SCG	Vulnerable; First fixed in Release 12.2SCH	Vulnerable; First fixed in Release 12.2SCH
  12.2SCH	12.2(33)SCH1	12.2(33)SCH1
  12.2SE	12.2(55)SE8 12.2(58)SE	12.2(55)SE8
  12.2SEG	Vulnerable; migrate to any release in 15.0SE	Vulnerable; First fixed in Release 15.0SE
  12.2SG	12.2(53)SG10; available December 2013 *	12.2(53)SG10; available December 2013 *
  12.2SGA	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.2SM	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.2SQ	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.2SRA	Vulnerable; First fixed in Release 12.2SRE	Vulnerable; First fixed in Release 12.2SRE
  12.2SRB	Vulnerable; First fixed in Release 12.2SRE	Vulnerable; First fixed in Release 12.2SRE
  12.2SRC	Vulnerable; First fixed in Release 12.2SRE	Vulnerable; First fixed in Release 12.2SRE
  12.2SRD	Vulnerable; First fixed in Release 12.2SRE	Vulnerable; First fixed in Release 12.2SRE
  12.2SRE	12.2(33)SRE9	12.2(33)SRE9
  12.2STE	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.2SV	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.2SVD	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.2SVE	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.2SW	Vulnerable; migrate to any release in 15.0M	Vulnerable; First fixed in Release 15.1M
  12.2SXF	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.2SXH	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.2SXI	12.2(33)SXI12	12.2(33)SXI12
  12.2SXJ	Not vulnerable	12.2(33)SXJ6
  12.2SY	Vulnerable; First fixed in Release 15.0SY	Vulnerable; First fixed in Release 15.0SY
  12.2WO	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.2XNA	Please see Cisco IOS XE Software Availability	Please see Cisco IOS XE Software Availability
  12.2XNB	Please see Cisco IOS XE Software Availability	Please see Cisco IOS XE Software Availability
  12.2XNC	Please see Cisco IOS XE Software Availability	Please see Cisco IOS XE Software Availability
  12.2XND	Please see Cisco IOS XE Software Availability	Please see Cisco IOS XE Software Availability
  12.2XNE	Please see Cisco IOS XE Software Availability	Please see Cisco IOS XE Software Availability
  12.2XNF	Please see Cisco IOS XE Software Availability	Please see Cisco IOS XE Software Availability
  12.2XO	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.2ZYA	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  Affected 12.3-Based Releases	First Fixed Release	First Fixed Release for All Advisories in the September 2013 Bundled Publication
  12.3BC	Vulnerable; First fixed in Release 12.2SCH	Vulnerable; First fixed in Release 12.2SCH
  12.3JEC	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.3JED	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.3JEE	Not vulnerable	Vulnerable; First fixed in Release 15.1M
  12.3JX	Not vulnerable	Vulnerable; First fixed in Release 15.1M
  12.3XI	Vulnerable; First fixed in Release 12.2SB	Vulnerable; First fixed in Release 12.2SB
  12.3XJ	Vulnerable; migrate to any release in 15.0M	Vulnerable; First fixed in Release 15.1M
  12.3XK	Vulnerable; migrate to any release in 15.0M	Vulnerable; First fixed in Release 15.1M
  12.3XL	Vulnerable; migrate to any release in 15.0M	Vulnerable; First fixed in Release 15.1M
  12.3XQ	Vulnerable; migrate to any release in 15.0M	Vulnerable; First fixed in Release 15.1M
  12.3XR	Vulnerable; migrate to any release in 15.0M	Vulnerable; First fixed in Release 15.1M
  12.3XU	Vulnerable; migrate to any release in 15.0M	Vulnerable; First fixed in Release 15.1M
  12.3XW	Vulnerable; migrate to any release in 15.0M	Vulnerable; First fixed in Release 15.1M
  12.3XX	Vulnerable; migrate to any release in 15.0M	Vulnerable; First fixed in Release 15.1M
  12.3YD	Vulnerable; migrate to any release in 15.0M	Vulnerable; First fixed in Release 15.1M
  12.3YF	Vulnerable; migrate to any release in 15.0M	Vulnerable; First fixed in Release 15.1M
  12.3YG	Vulnerable; migrate to any release in 15.0M	Vulnerable; First fixed in Release 15.1M
  12.3YI	Vulnerable; migrate to any release in 15.0M	Vulnerable; First fixed in Release 15.1M
  12.3YJ	Vulnerable; migrate to any release in 15.0M	Vulnerable; First fixed in Release 15.1M
  12.3YK	Vulnerable; migrate to any release in 15.0M	Vulnerable; First fixed in Release 15.1M
  12.3YM	Vulnerable; migrate to any release in 15.0M	Vulnerable; First fixed in Release 15.1M
  12.3YQ	Vulnerable; migrate to any release in 15.0M	Vulnerable; First fixed in Release 15.1M
  12.3YS	Vulnerable; migrate to any release in 15.0M	Vulnerable; First fixed in Release 15.1M
  12.3YT	Vulnerable; migrate to any release in 15.0M	Vulnerable; First fixed in Release 15.1M
  12.3YU	Vulnerable; migrate to any release in 15.0M	Vulnerable; First fixed in Release 15.1M
  12.3YX	Vulnerable; migrate to any release in 15.0M	Vulnerable; First fixed in Release 15.1M
  12.3YZ	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.3ZA	Vulnerable; migrate to any release in 15.0M	Vulnerable; First fixed in Release 15.1M
  Affected 12.4-Based Releases	First Fixed Release	First Fixed Release for All Advisories in the September 2013 Bundled Publication
  12.4	Vulnerable; migrate to any release in 15.0M	Vulnerable; First fixed in Release 15.1M
  12.4GC	Not vulnerable	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.4JA	Not vulnerable	Vulnerable; First fixed in Release 15.1M
  12.4JAL	Not vulnerable	Vulnerable; First fixed in Release 12.4JAM
  12.4JAM	Not vulnerable	12.4(25e)JAM2
  12.4JAN	Not vulnerable	Not vulnerable
  12.4JAX	Not vulnerable	Vulnerable; First fixed in Release 15.1M
  12.4JAZ	Not vulnerable	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.4JDA	Not vulnerable	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.4JDC	Not vulnerable	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.4JDD	Not vulnerable	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.4JDE	Not vulnerable	Vulnerable; First fixed in Release 15.1M
  12.4JHA	Not vulnerable	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.4JHB	Not vulnerable	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.4JHC	Not vulnerable	Vulnerable; First fixed in Release 15.1M
  12.4JK	Not vulnerable	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.4JL	Not vulnerable	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.4JX	Not vulnerable	Vulnerable; First fixed in Release 15.1M
  12.4JY	Not vulnerable	Vulnerable; First fixed in Release 15.1M
  12.4JZ	Not vulnerable	Vulnerable; First fixed in Release 15.1M
  12.4MD	Note: Releases prior to 12.4(22)MD are vulnerable; Releases 12.4(22)MD and later are not vulnerable.	Vulnerable; First fixed in Release 12.4MDB
  12.4MDA	Not vulnerable	Vulnerable; First fixed in Release 12.4MDB
  12.4MDB	Not vulnerable	12.4(24)MDB15
  12.4MR	Note: Releases prior to 12.4(20)MR are vulnerable; Releases 12.4(20)MR and later are not vulnerable.	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.4MRA	Not vulnerable	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.4MRB	Not vulnerable	Vulnerable; First fixed in Release 15.1M
  12.4SW	Vulnerable; migrate to any release in 15.0M	Vulnerable; First fixed in Release 15.1M
  12.4T	Note: Releases prior to 12.4(20)T are vulnerable; Releases 12.4(20)T and later are not vulnerable.	Vulnerable; First fixed in Release 15.1M
  12.4XA	Vulnerable; migrate to any release in 15.0M	Vulnerable; First fixed in Release 15.1M
  12.4XB	Vulnerable; migrate to any release in 15.0M	Vulnerable; First fixed in Release 15.1M
  12.4XC	Vulnerable; migrate to any release in 15.0M	Vulnerable; First fixed in Release 15.1M
  12.4XD	Vulnerable; migrate to any release in 15.0M	Vulnerable; First fixed in Release 15.1M
  12.4XE	Vulnerable; migrate to any release in 15.0M	Vulnerable; First fixed in Release 15.1M
  12.4XF	Vulnerable; migrate to any release in 15.0M	Vulnerable; First fixed in Release 15.1M
  12.4XG	Vulnerable; migrate to any release in 15.0M	Vulnerable; First fixed in Release 15.1M
  12.4XJ	Vulnerable; migrate to any release in 15.0M	Vulnerable; First fixed in Release 15.1M
  12.4XK	Vulnerable; migrate to any release in 15.0M	Vulnerable; First fixed in Release 15.1M
  12.4XL	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.4XM	Vulnerable; migrate to any release in 15.0M	Vulnerable; First fixed in Release 15.1M
  12.4XN	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.4XP	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.4XQ	Vulnerable; migrate to any release in 15.0M	Vulnerable; First fixed in Release 15.1M
  12.4XR	Note: Releases prior to 12.4(22)XR are vulnerable; Releases 12.4(22)XR and later are not vulnerable.	Vulnerable; First fixed in Release 15.1M
  12.4XT	Vulnerable; migrate to any release in 15.0M	Vulnerable; First fixed in Release 15.1M
  12.4XV	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.4XW	Vulnerable; migrate to any release in 15.0M	Vulnerable; First fixed in Release 15.1M
  12.4XY	Vulnerable; migrate to any release in 15.0M	Vulnerable; First fixed in Release 15.1M
  12.4XZ	Not vulnerable	Vulnerable; First fixed in Release 15.1M
  12.4YA	Not vulnerable	Vulnerable; First fixed in Release 15.1M
  12.4YB	Not vulnerable	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.4YD	Not vulnerable	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.4YE	Not vulnerable	Vulnerable; First fixed in Release 15.1M
  12.4YG	Not vulnerable	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  Affected 15.0-Based Releases	First Fixed Release	First Fixed Release for All Advisories in the September 2013 Bundled Publication
  15.0EA	Not vulnerable	15.0(2)EA1
  15.0EB	Not vulnerable	Vulnerable; migrate to any release in 15.2E
  15.0EC	Not vulnerable	Vulnerable; migrate to any release in 15.2E
  15.0ED	Not vulnerable	Note: Releases prior to 15.0(2)ED1 are vulnerable; Releases 15.0(2)ED1 and later are not vulnerable.
  15.0EH	Not vulnerable	Not vulnerable
  15.0EJ	Not vulnerable	Not vulnerable
  15.0EX	Cisco IOS XE devices: Please see Cisco IOS XE Software Availability	Cisco IOS XE devices: Please see Cisco IOS XE Software Availability
  15.0EY	Not vulnerable	15.0(2)EY2
  15.0EZ	Not vulnerable	Only Release 15.0(2)EZ is vulnerable
  15.0M	Not vulnerable	Vulnerable; First fixed in Release 15.1M
  15.0MR	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  15.0S	Cisco IOS XE devices: Please see Cisco IOS XE Software Availability	Vulnerable; First fixed in Release 15.1S Cisco IOS XE devices: Please see Cisco IOS XE Software Availability
  15.0SE	Not vulnerable	15.0(2)SE4
  15.0SG	Cisco IOS XE devices: Please see Cisco IOS XE Software Availability	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory. Cisco IOS XE devices: Please see Cisco IOS XE Software Availability
  15.0SQA	Cisco IOS XE devices: Please see Cisco IOS XE Software Availability	Cisco IOS XE devices: Please see Cisco IOS XE Software Availability
  15.0SQB	Cisco IOS XE devices: Please see Cisco IOS XE Software Availability	Cisco IOS XE devices: Please see Cisco IOS XE Software Availability
  15.0SY	15.0(1)SY3	15.0(1)SY5
  15.0XA	Not vulnerable	Vulnerable; First fixed in Release 15.1M
  15.0XO	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory. Cisco IOS XE devices: Please see Cisco IOS XE Software Availability	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory. Cisco IOS XE devices: Please see Cisco IOS XE Software Availability
  Affected 15.1-Based Releases	First Fixed Release	First Fixed Release for All Advisories in the September 2013 Bundled Publication
  15.1EY	Not vulnerable	Vulnerable; First fixed in Release 15.2S
  15.1GC	Not vulnerable	Vulnerable; First fixed in Release 15.1M
  15.1M	Not vulnerable	15.1(4)M7
  15.1MR	Releases prior to 15.1(3)MR are vulnerable; Releases 15.1(3)MR and later are not vulnerable.	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  15.1MRA	Not vulnerable	15.1(3)MRA2
  15.1S	Cisco IOS XE devices: Please see Cisco IOS XE Software Availability	15.1(3)S6 Cisco IOS XE devices: Please see Cisco IOS XE Software Availability
  15.1SG	Cisco IOS XE devices: Please see Cisco IOS XE Software Availability	15.1(2)SG1 Cisco IOS XE devices: Please see Cisco IOS XE Software Availability
  15.1SNG	Not vulnerable	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  15.1SNH	Not vulnerable	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  15.1SNI	Not vulnerable	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  15.1SVD	Not vulnerable	Not vulnerable
  15.1SVE	Not vulnerable	Not vulnerable
  15.1SVF	Not vulnerable	Not vulnerable
  15.1SY	Not vulnerable	15.1(1)SY2; Available on 28-OCT-13 15.1(2)SY
  15.1T	Not vulnerable	Vulnerable; First fixed in Release 15.1M
  15.1XO	Not vulnerable	Not vulnerable
  Affected 15.2-Based Releases	First Fixed Release	First Fixed Release for All Advisories in the September 2013 Bundled Publication
  There are no affected 15.2 based releases
  Affected 15.3-Based Releases	First Fixed Release	First Fixed Release for All Advisories in the September 2013 Bundled Publication
  There are no affected 15.3 based releases

  
  * Cisco Catalyst 4500 Series Switches with Cisco Catalyst 4500 Supervisor Engines 6-E or 6L-E can migrate to Cisco IOS Software Release 15.1SG.
  
  

   

  Cisco IOS XE Software

  Cisco IOS XE Software is affected by the vulnerability that is disclosed in this document.

  Cisco IOS XE Software Release	First Fixed Release	First Fixed Release for All Advisories in the September 2013 Cisco IOS Software Security Advisory Bundled Publication
  2.1.x	Vulnerable; migrate to 3.3.0S or later.	Vulnerable; migrate to 3.4.6S or later.
  2.2.x	Vulnerable; migrate to 3.3.0S or later.	Vulnerable; migrate to 3.4.6S or later.
  2.3.x	Vulnerable; migrate to 3.3.0S or later.	Vulnerable; migrate to 3.4.6S or later.
  2.4.x	Vulnerable; migrate to 3.3.0S or later.	Vulnerable; migrate to 3.4.6S or later.
  2.5.x	Vulnerable; migrate to 3.3.0S or later.	Vulnerable; migrate to 3.4.6S or later.
  2.6.x	Vulnerable; migrate to 3.3.0S or later.	Vulnerable; migrate to 3.4.6S or later.
  3.1.xS	Vulnerable; migrate to 3.3.0S or later.	Vulnerable; migrate to 3.4.6S or later.
  3.1.xSG	Vulnerable; migrate to 3.3.0SG or later.	Vulnerable; migrate to 3.4.1SG or later.
  3.2.xS	Vulnerable; migrate to 3.3.0S or later.	Vulnerable; migrate to 3.4.6S or later.
  3.2.xSE	Not vulnerable	3.2.3SE
  3.2.xSG	Vulnerable; migrate to 3.3.0SG or later.	Vulnerable; migrate to 3.4.1SG or later.
  3.2.xXO	Vulnerable; migrate to 3.3.0XO or later.	Vulnerable; migrate to 3.3.0XO or later.
  3.2.xSQ	Vulnerable; migrate to 3.3.0SQ or later.	Vulnerable; migrate to 3.3.0SQ or later.
  3.3.xS	3.3.0S	Vulnerable; migrate to 3.4.6S or later.
  3.3xSG	Not vulnerable	Vulnerable; migrate to 3.4.1SG or later.
  3.3.xXO	Not vulnerable	Not vulnerable
  3.3.xSQ	Not vulnerable	Not vulnerable
  3.4.xS	Not vulnerable	3.4.6S
  3.4.xSG	Not vulnerable	3.4.1SG *
  3.5.xS	Not vulnerable	Vulnerable; migrate to 3.7.4S or later.
  3.5.xE	Not vulnerable	Not vulnerable
  3.6.xS	Not vulnerable	Vulnerable; migrate to 3.7.4S or later.
  3.7.xS	Not vulnerable	3.7.4S
  3.8.xS	Not vulnerable	Vulnerable; migrate to 3.9.2S or later.
  3.9.xS	Not vulnerable	3.9.2S
  3.10.xS	Not vulnerable	Not vulnerable

  
  * Cisco Catalyst 4500 Series Switches with Cisco Catalyst 4500 Supervisor Engines 7-E and 7L-E and Cisco Catalyst 4500-X Series Switches can migrate to Cisco IOS XE Software Release 3.4SG.
  
  For a mapping of Cisco IOS XE Software releases to Cisco IOS Software releases, refer to Cisco IOS XE 2 Release Notes, Cisco IOS XE 3S Release Notes, and Cisco IOS XE 3SG Release Notes.
  

  Cisco IOS XR Software

  Cisco IOS XR Software is not affected by the vulnerability that is disclosed in this document

  
  

Exploitation and Public Announcements

• The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.

  This vulnerability was found when troubleshooting a customer case.

URL

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130925-ntp

Revision History

• Revision 1.0

  2013-September-25

  Initial public release

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