A vulnerability in the CLI of Cisco NX-OS System Software could allow an authenticated, local attacker to perform a command injection attack. The vulnerability is due to insufficient input validation of command arguments to the CLI parser. An attacker could exploit this vulnerability by injecting crafted command arguments into a vulnerable CLI command. An exploit could allow the attacker to execute arbitrary commands at the user's privilege level. On products that support multiple virtual device contexts (VDCs), this vulnerability could allow the attacker to execute commands at the user's privilege level outside the user's environment. 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-20171129-nxos7
| Vulnerable Product | Cisco Bug ID |
|---|---|
| MDS 9000 Series Multilayer Switches | CSCve99925 |
| Nexus 2000, 5000, and 6000 Series Switches | CSCvf15167 |
| Nexus 3000 Series Switches | CSCvf15164 |
| Nexus 7000 and 7700 Series Switches | CSCve99925 |
| Nexus 9000 Series Fabric Switches in Application Centric Infrastructure (ACI) mode | CSCvf15170 |
| Nexus 9000 Series Switches - Standalone, NX-OS mode | CSCvf15164 |
| Nexus 9500 R-Series Line Cards and Fabric Modules | CSCvf15173 |
For information about fixed software releases, consult the Cisco bug IDs 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.
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.
This vulnerability was found during internal security testing.
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.
| Version | Description | Section | Status | Date |
|---|---|---|---|---|
| 1.1 | Added the table of affected products and the bug ID for each affected product. | Vulnerable Products | Final | 2018-January-11 |
| 1.0 | Initial public release. | - | Final | 2017-November-29 |
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