Cisco Security Advisory
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CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:X/RL:X/RC:X
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A vulnerability in management interface access control list (ACL) configuration of Cisco NX-OS System Software could allow an unauthenticated, remote attacker to bypass configured ACLs on the management interface. This could allow traffic to be forwarded to the NX-OS CPU for processing, leading to high CPU utilization and a denial of service (DoS) condition.
The vulnerability is due to a bad code fix in the 7.3.2 code train that could allow traffic to the management interface to be misclassified and not match the proper configured ACLs. An attacker could exploit this vulnerability by sending crafted traffic to the management interface. An exploit could allow the attacker to bypass the configured management interface ACLs and impact the CPU of the targeted device, resulting in a DoS condition.
There are no workarounds that address this vulnerability.
This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180117-nxos
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Vulnerable Products
This vulnerability affects the following Cisco products running Cisco NX-OS System Software:
- Multilayer Director Switches
- Nexus 2000 Series Switches
- Nexus 3000 Series Switches
- Nexus 5500 Platform Switches
- Nexus 5600 Platform Switches
- Nexus 6000 Series Switches
- Nexus 7000 Series Switches
- Nexus 7700 Series Switches
Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by this vulnerability.
The following Cisco products are not affected by this vulnerability:
- Firepower 2100 Series
- Firepower 4100 Series Next-Generation Firewall
- Firepower 9300 Security Appliance
- Nexus 1000V Series Switches
- Nexus 1100 Series Cloud Services Platforms
- Nexus 3500 Platform Switches
- Nexus 3600 Platform Switches
- Nexus 9000 Series Switches in standalone NX-OS mode
- Nexus 9000 Series Fabric Switches in Application Centric Infrastructure (ACI) mode
- Nexus 9500 R-Series Line Cards and Fabric Modules
- Unified Computing System (UCS) 6100 Series Fabric Interconnects
- UCS 6200 Series Fabric Interconnects
- UCS 6300 Series Fabric Interconnects
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There are no workarounds that address this vulnerability.
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For information about fixed software releases, consult the Cisco bug ID(s) at the top of this advisory.
When considering software upgrades, customers are advised to regularly consult the advisories for Cisco products, which are available from the Cisco Security Advisories and Alerts page, 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 Cisco TAC 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 1.1 Nexus 9000 Series Switches in standalone NX-OS mode moved from vulnerable to not vulnerable product list. Vulnerable Products, Products Confirmed Not Vulnerable Final 2018-January-19 1.0 Initial public release. — Final 2018-January-17
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