Cisco Security Advisory
Cisco IOS XE Software IPv6 Neighbor Discovery Denial of Service Vulnerability
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AV:A/AC:L/Au:N/C:N/I:N/A:C/E:F/RL:OF/RC:C
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A vulnerability in the IPv6 neighbor discovery (ND) handling of Cisco IOS XE Software on ASR platforms could allow an unauthenticated, adjacent attacker to cause an affected device to crash.
The vulnerability is due to insufficient bounds on internal tables. An attacker could exploit this vulnerability by flooding an adjacent IOS XE device with specific ND messages. An exploit could allow the attacker to deplete the available memory, possibly causing an affected device to crash.
Cisco has released software updates that address these vulnerabilities. Workarounds that mitigate these vulnerabilities are available.
This advisory is available at the following link: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151214-ios
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Use the ipv6 nd cache interface-limit command to limit the amount of neighbors an interface will learn.
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When considering software upgrades, customers are advised to consult the Cisco Security Advisories and Responses 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.
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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.
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To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.
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Show LessVersion Description Section Status Date 1.1 Clarified the affected release versions. Affected Products Final 2015-December-15 1.0 Initial public release. - Final 2015-December-14
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