Cisco Security Advisory
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AV:A/AC:H/Au:N/C:C/I:C/A:C/E:POC/RL:OF/RC:C
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A vulnerability in DHCP code used with PowerOn Auto Provisioning (POAP) of Cisco NX-OS could allow an unauthenticated, adjacent attacker to inject arbitrary commands into the Cisco NX-OS device.
The vulnerability is due to insufficient input validation of the DHCP options returned as a result of POAP. An attacker could exploit this vulnerability by responding to the initial DHCP request initiated as part of POAP with crafted DHCP packets. An exploit could allow the attacker to execute arbitrary commands in the security context of the root user. The attack can occur during the POAP initialization process.
Cisco has confirmed the vulnerability and released software updates.
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 CSCur14589, CSCuv08354, CSCuu06246, CSCuv08345, and CSCus97328 for registered users, which contains additional details and an up-to-date list of affected product versions.
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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 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 Software contains a vulnerability that could allow an unauthenticated, adjacent attacker to inject arbitrary commands. Updates are available. NA Final 2015-Mar-27
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