Cisco Security Advisory
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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 Cisco Nexus 9000 Series Platform Leaf Switches for Application Centric Infrastructure (ACI) could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on the affected device.
The vulnerability is due to improper handling of a type of Layer 2 control plane traffic. An attacker could exploit this vulnerability by sending crafted traffic to a host behind a leaf switch. An exploit could allow the attacker to cause a DoS condition on the affected device.
Cisco has released software updates that address this vulnerability. There are no workarounds that mitigate this vulnerability. This advisory is available at the following link:
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20161102-n9kapic
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There are no workarounds that address this vulnerability. However, administrators may disable the ARP flood mode or unicast routing of the bridge domain by issuing the following commands on the APIC command-line interface (CLI):
apic1#
apic1# configure
apic1(config)# tenant t1
apic1(config-tenant)# bridge-domain 10
apic1(config-tenant-bd)# no arp flooding
apic1(config-tenant-bd)# no unicast routing
apic1(config-tenant-bd)# end
apic1#
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Cisco provides information about fixed software in Cisco bugs, which are accessible through the Cisco Bug Search Tool.
When considering software upgrades, customers are advised to regularly consult the advisories for Cisco products, which are available from the Cisco Security Advisories and Alerts page, 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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This vulnerability was reported to Cisco by an internal testing team.
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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 1.0 Initial public release. — Final 2016-November-02
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