Cisco IOS Software Multicast Network Time Protocol Denial of Service Vulnerability

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.

Advisory ID: cisco-sa-20130925-ntp

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130925-ntp

Revision 1.0

For Public Release 2013 September 25 16:00  UTC (GMT)

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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 free software updates that address this vulnerability. A workaround is available to mitigate this vulnerability.

This advisory is available at the following link: http://tools.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

[Expand all sections]     [Collapse all sections]



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/techsupportCopyright (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.

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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
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Vulnerability Scoring Details



Cisco has scored the vulnerability in this advisory based on the Common Vulnerability Scoring System (CVSS). The CVSS scoring in this security advisory is in accordance with CVSS version 2.0.

CVSS is a standards-based scoring method that conveys vulnerability severity and helps organizations determine the urgency and priority of a response.

Cisco has provided a base and temporal score. Customers can also compute environmental scores that help determine the impact of the vulnerability in their own networks.

Cisco has provided additional information regarding CVSS at the following link:

http://www.cisco.com/web/about/security/intelligence/cvss-qandas.html

Cisco has also provided a CVSS calculator to compute the environmental impact for individual networks at the following link:



http://intellishield.cisco.com/security/alertmanager/cvss





CSCuc81226:Cisco IOS Software Multicast NTP Denial of Service Vulnerability

Calculate the environmental score of CSCuc81226




CVSS Base Score - 7.1




Access Vector


Access Complexity


Authentication


Confidentiality Impact


Integrity Impact


Availability Impact




Network


Medium


None


None


None


Complete




CVSS Temporal Score - 5.9




Exploitability


Remediation Level


Report Confidence




Functional


Official-Fix


Confirmed



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Impact


Successful exploitation of this vulnerability may cause the affected device to reload. Repeated exploitation could result in a sustained DoS condition.
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Software Versions and Fixes



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 Intelligence Operations (SIO) portal at http://tools.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


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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.

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Obtaining Fixed Software



Cisco has released free software updates that address the vulnerability described in this advisory. Prior to deploying software, customers are advised to consult their maintenance providers or check the software for feature set compatibility and known issues that are specific to their environments.

Customers may only install and expect support for feature sets they have purchased. By installing, downloading, accessing, or otherwise using such software upgrades, customers agree to follow the terms of the Cisco software license at http://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.html .



Customers with Service Contracts






Customers Using Third-Party Support Organizations









Customers Without Service Contracts











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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.

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Status of This Notice: Final



THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.

A stand-alone copy or Paraphrase of the text of this document that omits the distribution URL in the following section is an uncontrolled copy, and may lack important information or contain factual errors.

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Distribution



This advisory is posted on Cisco Security Intelligence Operations at the following link:

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130925-ntp

Additionally, a text version of this advisory is clear signed with the Cisco PSIRT PGP key and circulated among the following e-mail addresses:
cust-security-announce@cisco.com
first-bulletins@lists.first.org
bugtraq@securityfocus.com
vulnwatch@vulnwatch.org
cisco@spot.colorado.edu
cisco-nsp@puck.nether.net
full-disclosure@lists.grok.org.uk

Future updates of this advisory, if any, will reside on Cisco.com but may not be announced on mailing lists. Users can monitor this advisory's URL for any updates.

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Revision History





Revision 1.0

2013-September-25

Initial public release


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Cisco Security Procedures


Complete information about reporting security vulnerabilities in Cisco products, obtaining assistance with security incidents, and registering to receive security information from Cisco is available on Cisco.com at http://www.cisco.com/en/US/products/products_security_vulnerability_policy.html . This web page includes instructions for press inquiries regarding Cisco Security Advisories. All Cisco Security Advisories are available at http://www.cisco.com/go/psirt .