Cisco Security Advisory
Cisco Nexus 4000 Series Switches IPv6 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 IP version 6 (IPv6) packet handling routine of Cisco NX-OS Software could allow an unauthenticated, adjacent attacker to cause a device to stop responding to neighbor solicitation (NS) requests, causing a limited denial of service (DoS) condition.
The vulnerability is due to improper processing of adjacencies in the IPv6 neighbor table. An attacker could exploit this vulnerability by sending a sequence of malformed IPv6 packets to an affected device. An exploit could allow the attacker to cause a device to stop responding to NS requests, causing a limited DoS condition.
Cisco has confirmed the vulnerability in a security notice and released software updates.
To exploit this vulnerability, an attacker would need access to the same broadcast or collision domain of the targeted device. This access requirement decreases the likelihood of a successful exploit.
Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available.
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Customers are advised to consult Cisco bug ID CSCtd15904 for the most complete list of affected product versions.
Vulnerable Products
At the time this alert was first published, Cisco NX-OS Software versions 4.1(2)E1(1j) and prior were vulnerable. Later releases of Cisco NX-OS Software may also be vulnerable.Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by these vulnerabilities.
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Administrators are advised to apply the appropriate updates
Administrators are advised to allow only trusted users to have network access.
Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.
Administrators are advised to monitor affected systems.
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Cisco customers with active contracts should contact their Cisco support team for assistance in upgrading to a software version that includes fixes for this vulnerability. Cisco customers without contracts may contact the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via email at tac@cisco.com for assistance.
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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 1.0 Initial Release NA Final 2013-Nov-13
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