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CVE-2018-0294: Cisco Security Advisory: Cisco FXOS and NX-OS Software Unauthorized Administrator Account Vulnerability

A vulnerability in the write-erase feature of Cisco FXOS Software and Cisco NX-OS Software could allow an authenticated, local attacker to configure an unauthorized administrator account for an affected device. The vulnerability exists because the affected software does not properly delete sensitive files when certain CLI commands are used to clear the device configuration and reload a device. An attacker could exploit this vulnerability by logging into an affected device as an administrative user and configuring an unauthorized account for the device. The account would not require a password for authentication and would be accessible only via a Secure Shell (SSH) connection to the device. A successful exploit could allow the attacker to configure an unauthorized account that has administrative privileges, does not require a password for authentication, and does not appear in the running configuration or the audit logs for the affected device. This vulnerability affects Firepower 4100 Series Next-Generation Firewalls, Firepower 9300 Security Appliance, Nexus 1000V Series Switches, Nexus 1100 Series Cloud Services Platforms, Nexus 2000 Series Fabric Extenders, Nexus 3500 Platform Switches, Nexus 4000 Series Switches, Nexus 5500 Platform Switches, Nexus 5600 Platform Switches, Nexus 6000 Series Switches, UCS 6100 Series Fabric Interconnects, UCS 6200 Series Fabric Interconnects, UCS 6300 Series Fabric Interconnects. Cisco Bug IDs: CSCvd13993, CSCvd34845, CSCvd34857, CSCvd34862, CSCvd34879, CSCve35753.

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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, consider that this advisory is part of a collection. For a complete list of the advisories in the collection and links to them, see Cisco Event Response: June 2018 Cisco FXOS and NX-OS Software Security Advisory Collection.

    In the following tables, the left column lists releases of Cisco FXOS or 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 collection of advisories and which release includes fixes for those vulnerabilities.

    **Firepower 4100 Series Next-Generation Firewalls: **CSCve35753****

    Cisco FXOS Software Release

    First Fixed Release for This Vulnerability

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

    1.1

    2.0.1.159

    2.0.1.159 or 2.3.1.58

    2.0

    2.0.1.159

    2.0.1.159 or 2.3.1.58

    2.1.1

    2.1.1.86

    2.1.1.86 or 2.3.1.58

    2.2

    2.2.2.17

    2.2.2.17 or 2.3.1.58

    2.2.2

    2.2.2.17

    2.2.2.17 or 2.3.1.58

    2.3

    Not vulnerable

    Not vulnerable

    Firepower 9300 Security Appliance: CSCve35753

    Cisco FXOS Software Release

    First Fixed Release for This Vulnerability

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

    1.1

    2.0.1.159

    2.0.1.159 or 2.3.1.58

    2.0

    2.0.1.159

    2.0.1.159 or 2.3.1.58

    2.1.1

    2.1.1.86

    2.1.1.86 or 2.3.1.58

    2.2

    2.2.2.17

    2.2.2.17 or 2.3.1.58

    2.2.2

    2.2.2.17

    2.2.2.17 or 2.3.1.58

    2.3

    Not vulnerable

    Not vulnerable

    Nexus 1000V Series Switches and Nexus 1100 Series Cloud Services Platforms: CSCvd34845

    Cisco NX-OS Software Release

    First Fixed Release for This Vulnerability

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

    Prior to 5.2

    5.2(1)SV3(3.1)

    5.2(1)SV3(3.15)

    5.2

    5.2(1)SV3(3.1)

    5.2(1)SV3(3.15)

    Nexus 3500 Platform Switches: CSCvd34857

    Cisco NX-OS Software Release

    First Fixed Release for This Vulnerability

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

    6.0(2)

    6.0(2)A8(7)

    7.0(3)I7(4)

    7.0(3)

    7.0(3)I7(2)

    7.0(3)I7(4)

    Nexus 4000 Series Switches: CSCvd34879

    Cisco NX-OS Software Release

    First Fixed Release for This Vulnerability

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

    4.1

    4.1(2)E1(1r)

    4.1(2)E1(1s)

    Nexus 2000 Series Fabric Extenders and Nexus 5500, 5600, and 6000 Series Switches: CSCvd13993

    Cisco NX-OS Software Release

    First Fixed Release for This Vulnerability

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

    6.0

    7.1(5)N1(1)

    7.3(3)N1(1)

    7.0

    7.1(5)N1(1)

    7.3(3)N1(1)

    7.1

    7.1(5)N1(1) or later

    7.3(3)N1(1)

    7.2

    7.3(2)N1(1)

    7.3(3)N1(1)

    7.3

    7.3(2)N1(1)

    7.3(3)N1(1)

    UCS 6100, 6200, and 6300 Fabric Interconnects: CSCvd34862

    Cisco NX-OS Software Release

    First Fixed Release for This Vulnerability

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

    Prior to 2.2

    3.1(3a)1

    3.2(2b)

    2.2

    3.1(3a)1

    3.2(2b)

    2.5

    3.1(3a)

    3.2(2b)

    3.0

    3.1(3a)

    3.2(2b)

    3.1

    3.1(3a)

    3.2(2b)

    3.2

    3.2(1d)

    3.2(2b)

    1 Cisco UCS 6100 Series Fabric Interconnects are vulnerable if they are running Cisco NX-OS Software Release 2.2 or prior. However, a fix is not available for Cisco UCS 6100 Series Fabric Interconnects because the product has reached end-of-life status. For more information, refer to the End-of-Sale and End-of-Life Announcement for the Cisco UCS 6100 Series Fabric Interconnects.

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