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 Address Resolution Protocol (ARP) feature of the Cisco Nexus Operating System (NX-OS) could allow an unauthenticated, adjacent attacker to cause a partial denial of service (DoS) condition because the ARP process unexpectedly restarts.
The vulnerability is due to improper input validation of the fields in the ARP packet header. An attacker could exploit this vulnerability by sending a crafted ARP packet from an adjacent network to the affected device. An exploit could allow the attacker to cause a partial DoS condition because the ARP process could unexpectedly restart when processing the crafted ARP packet.
Cisco has confirmed the vulnerability and software updates are available.
To exploit this vulnerability, an attacker must have access to the same broadcast or collision domain as the targeted device. This access requirement may reduce the likelihood of a successful exploit.
Although the CVSS indicates that software updates are not available to fix this vulnerability, there are known fixed releases available for Cisco bug IDs CSCut25292 and CSCuw02037.
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Cisco has released bug IDs CSCut25292, CSCuw02034, CSCuw02035, CSCuw02037, and CSCuw02038 for registered users, which contain additional details and up-to-date lists of affected product versions.
Vulnerable Products
At the time this alert was first published, the following Cisco products running Cisco NX-OS were vulnerable:
- Cisco Nexus 1000V Switch for VMware vSphere running Cisco NX-OS release 5.2(1)SV3(1.4)
- Cisco Nexus 3000 Series Switches running Cisco NX-OS release 7.3(0)ZD(0.47)
- Cisco Nexus 9000 Series Switches running Cisco NX-OS release 7.3(0)ZD(0.61)
- Cisco Nexus 4000 Series Switches running Cisco NX-OS release 4.1(2)E1
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 contact the vendor regarding future updates and releases.
Administrators are advised to allow only trusted users to have network access.
Administrators are advised to monitor affected systems.
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Cisco customers with active contracts can obtain updates through the Software Center at the following link: Cisco. Cisco customers without contracts can obtain upgrades by contacting the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via email at tac@cisco.com.
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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 NX-OS contains a vulnerability that could allow an unauthenticated, adjacent attacker to cause a denial of service condition. Updates are available. NA Final 2015-Sep-01
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