Cisco Nexus 9000 Information Disclosure Vulnerability

Summary

• A vulnerability in the internal iptables configuration for local interfaces on the Cisco Nexus 9000 Series Switch could allow an unauthenticated, remote attacker to access certain sensitive data. The attacker could use this information to conduct additional reconnaissance attacks.
  
  The vulnerability is due to incorrect filtering of network traffic destined to certain TCP and UDP ports configured on a local interface. An attacker could exploit this vulnerability by connecting to the affected device on one of the exposed TCP or UDP ports. An exploit could allow the attacker to discover certain sensitive data which should be restricted and could be used to conduct further attacks.
  
  Cisco has released software updates that address this vulnerability. A workaround to mitigate this vulnerability is available.
  
  This advisory is available at the following link:
  
  http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20161005-n9kinfo

Affected Products

• Vulnerable Products

  Cisco Nexus 9000 Series Switches in NX-OS (Standalone) mode running Cisco NX-OS Software Releases prior to 7.0(3)I2(2e) and 7.0(3)I4(1) are affected.

  Products Confirmed Not Vulnerable

  No other Cisco products are currently known to be affected by this vulnerability.

Workarounds

• An ACL can be applied to the configured local interfaces to prevent access to the unwanted ports.

Fixed Software

• Cisco provides information about fixed software in Cisco bugs, which are accessible through the Cisco Bug Search Tool.
  
  When considering software upgrades, customers are advised to consult the Cisco Security Advisories and Responses archive at http://www.cisco.com/go/psirt and review subsequent advisories to determine exposure and a complete upgrade solution.
  
  In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers.

Exploitation and Public Announcements

• 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.

Source

• This vulnerability was found during resolution of a support case.

URL

• http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20161005-n9kinfo

Revision History

• Version	Description	Section	Status	Date
  1.0	Initial public release.	-	Final	2016-October-05

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