Cisco NX-OS System Software CLI Command Injection Vulnerability

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Updated:November 29, 2017
Document ID:1511974875971113

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Cisco Security Advisory

Cisco NX-OS System Software CLI Command Injection Vulnerability

Medium
Advisory ID:
cisco-sa-20171129-nxos7
First Published:
2017 November 29 16:00 GMT
Last Updated: 
2018 January 11 18:32 GMT
Version 1.1:
Final
Workarounds:
No workarounds available
CVE-2017-12339
CWE-77
CVSS Score:
Base 5.7Click Icon to Copy Verbose Score
CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:L/E:X/RL:X/RC:X
CVE-2017-12339
CWE-77

Summary

  • 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

Affected Products

  • Vulnerable Products

    This vulnerability affects the following Cisco products running Cisco NX-OS System Software:
      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 affected releases, consult the Cisco bug IDs listed in the preceding table and at the top of this advisory.

      Products Confirmed Not Vulnerable

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

      Cisco has confirmed that the following 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 3500 Platform Switches
      • Unified Computing System Manager

    Workarounds

    • There are no workarounds that address this vulnerability.

    Fixed Software

    • 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.

    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 internal security testing.

    Cisco Security Vulnerability Policy

    • 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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    Revision History

    • 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
      Show Less

    Cisco Security Vulnerability Policy

    • 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.

    Subscribe to Cisco Security Notifications