Cisco NX-OS Software contains a vulnerability that could allow an unauthenticated, remote attacker to access sensitive information. Updates are available.
A vulnerability in the Simple Network Management Protocol (SNMP) module of Cisco NX-OS Software could allow an unauthenticated, remote attacker to access sensitive information.
The vulnerability is due to a failure to respond to invalid requests in the same manner when specifying a VLAN ID. An attacker could exploit this vulnerability by making a large number of requests to the listening SNMP port of an affected device. A successful exploit could allow the attacker to enumerate VLANs that are configured on the affected device.
This vulnerability affects Cisco Nexus 5000 Series and Cisco Nexus 6000 Series devices running an affected version of Cisco NX-OS Software.
Cisco would like to thank Ehab Hussein of IOActive for discovering and reporting this vulnerability.
Cisco has confirmed the vulnerability in a security notice and released software updates.
At the time this alert was first published, Cisco Nexus 5000 Series and Cisco Nexus 6000 Series devices running Cisco NX-OS Software versions 7.0(3)N1(1) and prior were vulnerable. Later releases of Cisco NX-OS Software may also be vulnerable.
To exploit this vulnerability, an attacker may need access to trusted, internal networks behind a firewall to make a large number of request to the targeted device. This access requirement may reduce the likelihood of a successful exploit. In addition, the attacker may need to obtain additional information such as whether SNMP and VLAN IDs are configured on the device prior to attempting to exploit this vulnerability.
Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available.
Cisco has released a security notice at the following link: CVE-2014-3341
Customers are advised to consult Cisco bug ID CSCup85616 for the most complete list of affected product versions.
An unauthenticated, remote attacker could exploit this vulnerability to enumerate VLANs that are configured on an affected device. A successful exploit could allow the attacker to access sensitive information that could be used to conduct further attacks.
The vulnerability is due to a failure to respond to invalid requests in the same manner when specifying a VLAN ID by a device running an affected version of Cisco NX-OS Software.
An unauthenticated, remote attacker could exploit this vulnerability by making a large number of requests to the listening SNMP port of an affected device. A successful exploit could allow the attacker to enumerate VLANs that are configured on the affected device, which the attacker could use to access sensitive information.
Administrators are advised to apply the appropriate updates.
Administrators are advised to allow only trusted users to have network access.
Administrators can help protect affected systems from external attacks by using a solid firewall strategy.
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.
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 firstname.lastname@example.org for assistance.
The urgency and severity ratings of this alert are not tailored to individual users; users may value alerts differently based upon their network configurations and circumstances. THE ALERT, AND INFORMATION CONTAINED THEREIN, ARE PROVIDED ON AN "AS IS" BASIS AND DO NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE ALERT, AND INFORMATION CONTAINED THEREIN, OR MATERIALS LINKED FROM THE ALERT, IS AT YOUR OWN RISK. INFORMATION IN THIS ALERT AND ANY RELATED COMMUNICATIONS IS BASED ON OUR KNOWLEDGE AT THE TIME OF PUBLICATION AND IS SUBJECT TO CHANGE WITHOUT NOTICE. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE ALERTS AT ANY TIME.