Cisco Security Advisory
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AV:N/AC:L/Au:N/C:P/I:N/A:N/E:F/RL:OF/RC:C
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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.
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.
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Customers are advised to consult Cisco bug ID CSCup85616 for the most complete list of affected product versions.
Vulnerable Products
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.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 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.
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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 2014-Aug-18
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