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CVE-2019-1600: Cisco Security Advisory: Cisco FXOS and NX-OS Software Unauthorized Directory Access Vulnerability

A vulnerability in the file system permissions of Cisco FXOS Software and Cisco NX-OS Software could allow an authenticated, local attacker to access sensitive information that is stored in the file system of an affected system. The vulnerability is due to improper implementation of file system permissions. An attacker could exploit this vulnerability by accessing and modifying restricted files. A successful exploit could allow the attacker to access sensitive and critical files. Firepower 4100 Series Next-Generation Firewalls are affected in versions prior to 2.2.2.91 and 2.3.1.110. Firepower 9300 Series Next-Generation Firewalls are affected in versions prior to 2.2.2.91 and 2.3.1.110. MDS 9000 Series Multilayer Switches are affected in versions prior to 6.2(25), 8.1(1b), and 8.3(1). Nexus 3000 Series Switches are affected in versions prior to 7.0(3)I4(9) and 7.0(3)I7(4). Nexus 3500 Platform Switches are affected in versions prior to 6.0(2)A8(10) and 7.0(3)I7(4). Nexus 3600 Platform Switches are affected in versions prior to 7.0(3)F3(5). Nexus 2000, 5500, 5600, and 6000 Series Switches are affected in versions prior to 7.1(5)N1(1b) and 7.3(3)N1(1). Nexus 7000 and 7700 Series Switches are affected in versions prior to 6.2(22), 7.3(3)D1(1), and 8.2(3). Nexus 9000 Series Switches-Standalone are affected in versions prior to 7.0(3)I4(9) and 7.0(3)I7(4). Nexus 9500 R-Series Line Cards and Fabric Modules are affected in versions prior to 7.0(3)F3(5).

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  • Cisco has released free software updates that address the vulnerability described in this advisory. Customers may only install and expect support for software versions and feature sets for which they have purchased a license. By installing, downloading, accessing, or otherwise using such software upgrades, customers agree to follow the terms of the Cisco software license:
    https://www.cisco.com/c/en/us/products/end-user-license-agreement.html

    Additionally, customers may only download software for which they have a valid license, procured from Cisco directly, or through a Cisco authorized reseller or partner. In most cases this will be a maintenance upgrade to software that was previously purchased. Free security software updates do not entitle customers to a new software license, additional software feature sets, or major revision upgrades.

    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.

    Customers Without Service Contracts

    Customers who purchase directly from Cisco but do not hold a Cisco service contract and customers who make purchases through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should obtain upgrades by contacting the Cisco TAC:
    https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html

    Customers should have the product serial number available and be prepared to provide the URL of this advisory as evidence of entitlement to a free upgrade.

    Fixed Releases

    Customers are advised to upgrade to an appropriate release as indicated in the applicable table in this section. To help ensure a complete upgrade solution, customers should consider that this advisory is part of a bundled publication. The following page provides a complete list of bundle advisories: Cisco Event Response: March 2019 Cisco FXOS and NX-OS Software Security Advisory Bundled Publication.

    In the following tables, the left column lists releases of Cisco FXOS Software or Cisco NX-OS Software. The center column indicates whether a release is affected by the vulnerability described in this advisory and the first release that includes the fix for this vulnerability. The right column indicates whether a release is affected by all the vulnerabilities described in this bundle and which release includes fixes for those vulnerabilities.

    Although the releases listed in the right column of each table include fixes for the vulnerabilities, the fix related to the Cisco NX-OS Software Image Signature Verification Vulnerability requires a BIOS upgrade as part of the software upgrade. Customers who are upgrading the software for any of the following products are advised to refer to this advisory for further details about the BIOS upgrade and affected product IDs and BIOS versions:

    • Nexus 3000 Series Switches
    • Nexus 9000 Series Fabric Switches in ACI mode
    • Nexus 9000 Series Switches in standalone NX-OS mode
    • Nexus 9500 R-Series Line Cards and Fabric Modules

    Firepower 4100 Series Next-Generation Firewalls: CSCvi96554

    Cisco FXOS Software Release

    First Fixed Release for This Vulnerability

    First Fixed Release for All Vulnerabilities Described in the Bundle of Advisories

    1.1

    2.2.2.91

    2.2.2.91

    2.0

    2.2.2.91

    2.2.2.91

    2.1

    2.2.2.91

    2.2.2.91

    2.2

    2.2.2.91

    2.2.2.91

    2.3

    2.3.1.110

    2.3.1.110

    2.4

    Not Vulnerable

    2.4.1.122

    Firepower 9300 Security Appliance: CSCvi96554

    Cisco FXOS Software Release

    First Fixed Release for This Vulnerability

    First Fixed Release for All Vulnerabilities Described in the Bundle of Advisories

    1.1

    2.2.2.91

    2.2.2.91

    2.0

    2.2.2.91

    2.2.2.91

    2.1

    2.2.2.91

    2.2.2.91

    2.2

    2.2.2.91

    2.2.2.91

    2.3

    2.3.1.110

    2.3.1.110

    2.4

    Not Vulnerable

    2.4.1.122

    MDS 9000 Series Multilayer Switches: CSCvh75886

    Cisco NX-OS Software Release

    First Fixed Release for This Vulnerability

    First Fixed Release for All Vulnerabilities Described in the Bundle of Advisories

    5.2

    6.2(25)

    6.2(27)

    6.2

    6.2(25)

    6.2(27)

    7.3

    8.1(1b)

    8.3(2)

    8.1

    8.1(1b)

    8.3(2)

    8.2

    8.3(1)

    8.3(2)

    8.3

    Not Vulnerable

    8.3(2)

    Nexus 3000 Series Switches: CSCvh75949

    Cisco NX-OS Software Release

    First Fixed Release for This Vulnerability

    First Fixed Release for All Vulnerabilities Described in the Bundle of Advisories

    Prior to 7.0(3)I4

    7.0(3)I4(9)

    7.0(3)I7(6)

    7.0(3)I4

    7.0(3)I4(9)

    7.0(3)I7(6)

    7.0(3)I5

    7.0(3)I7(4)

    7.0(3)I7(6)

    7.0(3)I6

    7.0(3)I7(4)

    7.0(3)I7(6)

    7.0(3)I7

    7.0(3)I7(4)

    7.0(3)I7(6)

    9.2

    Not Vulnerable

    9.2(2)

    Nexus 3500 Platform Switches: CSCvi96549

    Cisco NX-OS Software Release

    First Fixed Release for This Vulnerability

    First Fixed Release for All Vulnerabilities Described in the Bundle of Advisories

    Prior to 6.0(2)A8

    6.0(2)A8(10)

    6.0(2)A8(11)

    6.0(2)A8

    6.0(2)A8(10)

    6.0(2)A8(11)

    7.0(3)

    7.0(3)I7(4)

    7.0(3)I7(6)

    9.2

    Not Vulnerable

    9.2(2)

    Nexus 3600 Platform Switches:CSCvi96559

    Cisco NX-OS Software Release

    First Fixed Release for This Vulnerability

    First Fixed Release for All Vulnerabilities Described in the Bundle of Advisories

    7.0(3)F3

    7.0(3)F3(3c)1

    7.0(3)F3(5)

    9.2(1)

    Not Vulnerable

    9.2(2)

    1This vulnerability is not fixed in 7.0(3)F3(4) but is fixed in 7.0(3)F3(5).

    Nexus 2000, 5500, 5600, and 6000 Series Switches: CSCvi96551

    Cisco NX-OS Software Release

    First Fixed Release for This Vulnerability

    First Fixed Release for All Vulnerabilities Described in the Bundle of Advisories

    Prior to 5.2

    7.1(5)N1(1b)

    7.1(5)N1(1b)

    5.2

    7.1(5)N1(1b)

    7.1(5)N1(1b)

    6.0

    7.1(5)N1(1b)

    7.1(5)N1(1b)

    7.0

    7.1(5)N1(1b)

    7.1(5)N1(1b)

    7.1

    7.1(5)N1(1b)

    7.1(5)N1(1b)

    7.2

    7.3(3)N1(1)

    7.3(5)N1(1)

    7.3

    7.3(3)N1(1)

    7.3(5)N1(1)

    Nexus 7000 and 7700 Series Switches: CSCvh75886

    Cisco NX-OS Software Release

    First Fixed Release for This Vulnerability

    First Fixed Release for All Vulnerabilities Described in the Bundle of Advisories

    Prior to 6.2

    6.2(22)

    6.2(22)

    6.2

    6.2(22)

    6.2(22)

    7.2

    7.3(3)D1(1)

    8.2(3)

    7.3

    7.3(3)D1(1)

    8.2(3)

    8.0

    8.2(3)

    8.2(3)

    8.1

    8.2(3)

    8.2(3)

    8.2

    8.2(3)

    8.2(3)

    8.3

    Not Vulnerable

    8.3(2)

    Nexus 9000 Series Switches-Standalone: CSCvh75949

    Cisco NX-OS Software Release

    First Fixed Release for This Vulnerability

    First Fixed Release for All Vulnerabilities Described in the Bundle of Advisories

    Prior to 7.0(3)I4

    7.0(3)I4(9)

    7.0(3)I7(6)

    7.0(3)I4

    7.0(3)I4(9)

    7.0(3)I7(6)

    7.0(3)I5

    7.0(3)I7(4)

    7.0(3)I7(6)

    7.0(3)I6

    7.0(3)I7(4)

    7.0(3)I7(6)

    7.0(3)I7

    7.0(3)I7(4)

    7.0(3)I7(6)

    9.2

    Not Vulnerable

    9.2(2)

    Nexus 9500 R-Series Line Cards and Fabric Modules: CSCvi96559

    Cisco NX-OS Software Release

    First Fixed Release for This Vulnerability

    First Fixed Release for All Vulnerabilities Described in the Bundle of Advisories

    7.0(3)F1

    7.0(3)F3(3c)1

    7.0(3)F3(5)

    7.0(3)F2

    7.0(3)F3(3c)1

    7.0(3)F3(5)

    7.0(3)F3

    7.0(3)F3(3c)1

    7.0(3)F3(5)

    9.2(1)

    Not Vulnerable

    9.2(2)

    1This vulnerability is not fixed in 7.0(3)F3(4) but is fixed in 7.0(3)F3(5).

    Additional Resources

    For help determining the best Cisco NX-OS Software release for a Cisco Nexus Switch, administrators can refer to the following Recommended Releases documents. If a security advisory recommends a later release, Cisco recommends following the advisory guidance.

    Cisco MDS Series Switches
    Cisco Nexus 1000V for VMware Switch
    Cisco Nexus 3000 Series and 3500 Series Switches
    Cisco Nexus 5000 Series Switches
    Cisco Nexus 5500 Platform Switches
    Cisco Nexus 6000 Series Switches
    Cisco Nexus 7000 Series Switches
    Cisco Nexus 9000 Series Switches
    Cisco Nexus 9000 Series ACI-Mode Switches

    For help determining the best Cisco NX-OS Software release for Cisco UCS, refer to the Recommended Releases documents in the release notes for the device.

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