Cisco Security Notice

Cisco Network Time Protocol Distributed Reflective Denial of Service Vulnerability

http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2013-5211
CVE ID: CVE-2013-5211
Release Date: 2014 January 15 00:28  UTC (GMT)
Last Updated: 2014 March 24 22:24  UTC (GMT)


Summary

A vulnerability in the Network Time Protocol (NTP) package of several Cisco products could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.

The vulnerability is due to processing MODE_PRIVATE (Mode 7) NTP control messages, which have a large amplification vector. An attacker could exploit this vulnerability by sending Mode 7 control requests to NTP servers and observing responses amplified up to 5,500 times in size. An exploit could allow the attacker to cause a DoS condition in which the affected NTP server is forced to process and respond with large response data.

Affected Products

ProductMore InformationCVSS
Cisco NX-OS SoftwareCSCum521485.0/4.5
IOSCSCtd750335.0/4.1
Cisco IOS XE SoftwareCSCtd750335.0/4.1
Cisco Unified Communications ManagerCSCum769375.0/4.5
Cisco MXE 3500 (Media Experience Engine)CSCum713115.0/4.5
Cisco Videoscape Distribution Suite Transparent Caching (VDS TC) CSCum936915.0/4.1
Cisco Digital Content Manager (DCM) SoftwareCSCun233215.0/4.8
Cisco Video Surveillance Operations Manager SoftwareCSCun449095.0/4.8
Cisco Unified Contact Center ExpressCSCun849095.0/4.8
Cisco MediaSenseCSCun849185.0/4.8
Cisco SocialMinerCSCun849245.0/4.8
Cisco FinesseCSCun849345.0/4.8
Cisco Unified Intelligence CenterCSCun849435.0/4.8

What Is a Cisco Security Notice?

The Cisco Product Security Incident Response Team (PSIRT) publishes Cisco Security Notices to inform customers of low- to mid-level severity security issues involving Cisco products.

Customers who wish to upgrade to a software version that includes fixes for these issues should contact their normal support channels. Free software updates will not be provided for issues that are disclosed through a Cisco Security Notice.

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Customers Using Third-Party Support Organizations

Customers may have Cisco products that are provided or maintained through prior or existing agreements with third-party support organizations, such as Cisco Partners, authorized resellers, or service providers. For these products, customers should consult their service providers or support organizations to ensure that any applied workaround or fix is the most appropriate in the intended network before it is deployed.

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