Cisco Security AdvisoryMedium
Advisory ID:
cisco-sa-20161005-n9kinfo
First Published:
2016 October 5 16:00 GMT
Version 1.0:
Workarounds:
Cisco Bug IDs:
CVSS Score:
Base 5.0,
Temporal 4.1
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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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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 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:
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20161005-n9kinfo
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An ACL can be applied to the configured local interfaces to prevent access to the unwanted ports.
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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.
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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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This vulnerability was found during resolution of a support case.
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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 public release. — Final 2016-October-05
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