Cisco Security Advisory
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AV:A/AC:L/Au:N/C:N/I:N/A:C/E:F/RL:U/RC:C
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A vulnerability in the Address Resolution Protocol (ARP) input packet processing of the Cisco Nexus Operating System (NX-OS) devices could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition.
The vulnerability is due to improper validation of the ARP packet and the maximum transmission unit (MTU) size, which results in a buffer overflow and could cause a DoS condition. An attacker could exploit the vulnerability by sending a crafted ARP packet to the device. An exploit could allow the attacker to cause the device to become unavailable due to the DoS condition of the ARP module.
Cisco has confirmed the vulnerability. Software updates are unavailable.
An unauthenticated, adjacent attacker could exploit this vulnerability if the targeted device is set to default configuration settings and running the affected version of the software.
To exploit this vulnerability, an attacker must be on the same broadcast or collision domain as the affected device. This access requirement could decrease the likelihood of a successful exploit.
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Cisco has released bug IDs CSCuv71933, CSCuv61321, CSCuu78074, CSCut37060, CSCuv61266, CSCuv61351, CSCuv61358, and CSCuv61366 for registered users, which contain additional details and up-to-date lists of affected product versions.
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Administrators are advised to contact the vendor regarding future updates and releases.
Administrators are advised to allow only trusted users to access local systems.
Administrators are advised to monitor affected systems.
Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.
Administrators are advised to lower the configuration of the MTU size.
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Updates are unavailable.
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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 Cisco Nexus Operating System Address Resolution Protocol contains a vulnerability that could allow an unauthenticated, adjacent attacker to cause a denial of service condition. Updates are unavailable. NA Final 2015-Aug-14
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