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             AUSCERT External Security Bulletin Redistribution

                               ESB-2021.0706
Cisco Nexus 9000 Series Fabric Switches ACI Mode: Multiple vulnerabilities
                             25 February 2021

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Cisco Nexus 9000 Series Fabric Switch
Publisher:         Cisco Systems
Operating System:  Cisco
                   Virtualisation
Impact/Access:     Denial of Service   -- Remote/Unauthenticated
                   Unauthorised Access -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-1231 CVE-2021-1230 CVE-2021-1228

Original Bulletin: 
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-n9kaci-bgp-De9dPKSK
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-n9kaci-unauth-access-5PWzDx2w
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apic-lldap-dos-WerV9CFj

Comment: This bulletin contains three (3) Cisco Systems security advisories.

- --------------------------BEGIN INCLUDED TEXT--------------------

Cisco Nexus 9000 Series Fabric Switches ACI Mode BGP Route Installation Denial
of Service Vulnerability

Priority:        High
Advisory ID:     cisco-sa-n9kaci-bgp-De9dPKSK
First Published: 2021 February 24 16:00 GMT
Version 1.0:     Final
Workarounds:     No workarounds available
Cisco Bug IDs:   CSCvr59494
CVE Names:       CVE-2021-1230
CWEs:            CWE-233

Summary

  o A vulnerability with the Border Gateway Protocol (BGP) for Cisco Nexus 9000
    Series Fabric Switches in Application Centric Infrastructure (ACI) mode
    could allow an unauthenticated, remote attacker to cause a routing process
    to crash, which could lead to a denial of service (DoS) condition.

    This vulnerability is due to an issue with the installation of routes upon
    receipt of a BGP update. An attacker could exploit this vulnerability by
    sending a crafted BGP update to an affected device. A successful exploit
    could allow the attacker to cause the routing process to crash, which could
    cause the device to reload. This vulnerability applies to both Internal BGP
    (IBGP) and External BGP (EBGP).

    Note: The Cisco implementation of BGP accepts incoming BGP traffic from
    explicitly configured peers only. To exploit this vulnerability, an
    attacker would need to send a specific BGP update message over an
    established TCP connection that appears to come from a trusted BGP peer.

    Cisco has released software updates that address this vulnerability. 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-n9kaci-bgp-De9dPKSK

    This advisory is part of the February 2021 Cisco FXOS and NX-OS Software
    Security Advisory Bundled Publication. For a complete list of the
    advisories and links to them, see Cisco Event Response: February 2021 Cisco
    FXOS and NX-OS Software Security Advisory Bundled Publication .

Affected Products

  o Vulnerable Products

    This vulnerability affects Cisco Nexus 9000 Series Fabric Switches in ACI
    mode if they are configured for BGP.

    For information about which Cisco software releases are vulnerable, see the
    Fixed Software section of this advisory.

    Determine the Device Configuration

    To determine whether a Nexus device is configured with BGP and a BGP
    neighbor, use the show bgp sessions vrf all command. If one or more BGP
    peers is returned, then the device should be considered vulnerable.

        Router# show bgp sessions vrf all
        Total peers 2, established peers 2

    Products Confirmed Not Vulnerable

    Only products listed in the Vulnerable Products section of this advisory
    are known to be affected by this vulnerability.

    Cisco has confirmed that this vulnerability does not affect the following
    Cisco products:

       Firepower 1000 Series
       Firepower 2100 Series
       Firepower 4100 Series
       Firepower 9300 Security Appliances
       MDS 9000 Series Multilayer Switches
       Nexus 1000 Virtual Edge for VMware vSphere
       Nexus 1000V Switch for Microsoft Hyper-V
       Nexus 1000V Switch for VMware vSphere
       Nexus 3000 Series Switches
       Nexus 5500 Platform Switches
       Nexus 5600 Platform Switches
       Nexus 6000 Series Switches
       Nexus 7000 Series Switches
       Nexus 9000 Series Switches in standalone NX-OS mode
       UCS 6200 Series Fabric Interconnects
       UCS 6300 Series Fabric Interconnects
       UCS 6400 Series Fabric Interconnects

Workarounds

  o There are no workarounds that address this vulnerability.

Fixed Software

  o 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 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.

    Cisco NX-OS Software

    To help customers determine their exposure to vulnerabilities in Cisco
    NX-OS Software, Cisco provides the Cisco Software Checker to identify any
    Cisco Security Advisories that impact a specific Cisco NX-OS Software
    release and the earliest release that fixes the vulnerabilities that are
    described in each advisory ("First Fixed"). If applicable, the tool also
    returns the earliest release that fixes all the vulnerabilities described
    in all the advisories identified ("Combined First Fixed").

    Customers can use the Cisco Software Checker to search advisories in the
    following ways:

       Choose the software, platform, and one or more releases
       Upload a .txt file that includes a list of specific releases
       Enter the output of the show version command

    After initiating a search, customers can customize the search to include
    all Cisco Security Advisories or one or more specific advisories.

    Customers can also use the following form to determine whether a release is
    affected by any Cisco Security Advisory by choosing the Cisco NX-OS
    Software and platform and then entering a release-for example, 7.0(3)I7(5) 
    for Cisco Nexus 3000 Series Switches or 14.0(1h) for Cisco NX-OS Software
    in ACI mode.

    By default, the Cisco Software Checker includes results only for
    vulnerabilities that have a Critical or High Security Impact Rating (SIR).
    To include results for Medium SIR vulnerabilities, customers can use the
    Cisco Software Checker and check the Medium check box in the drop-down list
    under Impact Rating when customizing a search.

    Additional Resources

    For help determining the best Cisco NX-OS Software release for a Cisco
    Nexus Switch, see 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 Switches
        Cisco Nexus 5500 Platform Switches
        Cisco Nexus 5600 Platform Switches
        Cisco Nexus 6000 Series Switches
        Cisco Nexus 7000 Series Switches
        Cisco Nexus 9000 Series Switches
        Cisco Nexus 9000 Series ACI-Mode Switches

    To determine the best release for Cisco UCS Software, see the Recommended
    Releases documents in the release notes for the device.

Exploitation and Public Announcements

  o 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

  o This vulnerability was found during the resolution of a Cisco TAC support
    case.

Cisco Security Vulnerability Policy

  o 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.

Related to This Advisory

  o Cisco Event Response: February 2021 Cisco FXOS and NX-OS Software Security
    Advisory Bundled Publication

URL

  o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-n9kaci-bgp-De9dPKSK

Revision History

  o +----------+---------------------------+----------+--------+--------------+
    | Version  |        Description        | Section  | Status |     Date     |
    +----------+---------------------------+----------+--------+--------------+
    | 1.0      | Initial public release.   | -        | Final  | 2021-FEB-24  |
    +----------+---------------------------+----------+--------+--------------+


- --------------------------------------------------------------------------------


Cisco Nexus 9000 Series Fabric Switches ACI Mode Fabric Infrastructure VLAN
Unauthorized Access Vulnerability

Priority:        High
Advisory ID:     cisco-sa-n9kaci-unauth-access-5PWzDx2w
First Published: 2021 February 24 16:00 GMT
Version 1.0:     Final
Workarounds:     No workarounds available
Cisco Bug IDs:   CSCvu84576
CVE Names:       CVE-2021-1228
CWEs:            CWE-284

Summary

  o A vulnerability in the fabric infrastructure VLAN connection establishment
    of Cisco Nexus 9000 Series Fabric Switches in Application Centric
    Infrastructure (ACI) Mode could allow an unauthenticated, adjacent attacker
    to bypass security validations and connect an unauthorized server to the
    infrastructure VLAN.

    This vulnerability is due to insufficient security requirements during the
    Link Layer Discovery Protocol (LLDP) setup phase of the infrastructure
    VLAN. An attacker could exploit this vulnerability by sending a crafted
    LLDP packet on the adjacent subnet to an affected device. A successful
    exploit could allow the attacker to connect an unauthorized server to the
    infrastructure VLAN, which is highly privileged. With a connection to the
    infrastructure VLAN, the attacker can make unauthorized connections to
    Cisco Application Policy Infrastructure Controller (APIC) services or join
    other host endpoints.

    Cisco has released software updates that address this vulnerability. There
    are workarounds that address this vulnerability.

    This advisory is available at the following link:
    https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-n9kaci-unauth-access-5PWzDx2w

    This advisory is part of the February 2021 Cisco FXOS and NX-OS Software
    Security Advisory Bundled Publication. For a complete list of the
    advisories and links to them, see Cisco Event Response: February 2021 Cisco
    FXOS and NX-OS Software Security Advisory Bundled Publication .

Affected Products

  o Vulnerable Products

    This vulnerability affects Cisco Nexus 9000 Series Fabric Switches in ACI
    mode with the default configuration.

    For information about which Cisco software releases are vulnerable, see the
    Fixed Software section of this advisory.

    Products Confirmed Not Vulnerable

    Only products listed in the Vulnerable Products section of this advisory
    are known to be affected by this vulnerability.

    Cisco has confirmed that this vulnerability does not affect the following
    Cisco products:

       Firepower 1000 Series
       Firepower 2100 Series
       Firepower 4100 Series
       Firepower 9300 Security Appliances
       MDS 9000 Series Multilayer Switches
       Nexus 1000 Virtual Edge for VMware vSphere
       Nexus 1000V Switch for Microsoft Hyper-V
       Nexus 1000V Switch for VMware vSphere
       Nexus 3000 Series Switches
       Nexus 5500 Platform Switches
       Nexus 5600 Platform Switches
       Nexus 6000 Series Switches
       Nexus 7000 Series Switches
       Nexus 9000 Series Switches in standalone NX-OS mode
       UCS 6200 Series Fabric Interconnects
       UCS 6300 Series Fabric Interconnects
       UCS 6400 Series Fabric Interconnects

Workarounds

  o There are no workarounds that address this vulnerability.

Fixed Software

  o 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 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.

    Cisco NX-OS Software

    To help customers determine their exposure to vulnerabilities in Cisco
    NX-OS Software, Cisco provides the Cisco Software Checker to identify any
    Cisco Security Advisories that impact a specific Cisco NX-OS Software
    release and the earliest release that fixes the vulnerabilities that are
    described in each advisory ("First Fixed"). If applicable, the tool also
    returns the earliest release that fixes all the vulnerabilities described
    in all the advisories identified ("Combined First Fixed").

    Customers can use the Cisco Software Checker to search advisories in the
    following ways:

       Choose the software, platform, and one or more releases
       Upload a .txt file that includes a list of specific releases
       Enter the output of the show version command

    After initiating a search, customers can customize the search to include
    all Cisco Security Advisories or one or more specific advisories.

    Customers can also use the following form to determine whether a release is
    affected by any Cisco Security Advisory by choosing the Cisco NX-OS
    Software and platform and then entering a release-for example, 7.0(3)I7(5) 
    for Cisco Nexus 3000 Series Switches or 14.0(1h) for Cisco NX-OS Software
    in ACI mode.

    By default, the Cisco Software Checker includes results only for
    vulnerabilities that have a Critical or High Security Impact Rating (SIR).
    To include results for Medium SIR vulnerabilities, customers can use the
    Cisco Software Checker and check the Medium check box in the drop-down list
    under Impact Rating when customizing a search.

    Additional Resources

    For help determining the best Cisco NX-OS Software release for a Cisco
    Nexus Switch, see 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 Switches
        Cisco Nexus 5500 Platform Switches
        Cisco Nexus 5600 Platform Switches
        Cisco Nexus 6000 Series Switches
        Cisco Nexus 7000 Series Switches
        Cisco Nexus 9000 Series Switches
        Cisco Nexus 9000 Series ACI-Mode Switches

    To determine the best release for Cisco UCS Software, see the Recommended
    Releases documents in the release notes for the device.

Exploitation and Public Announcements

  o 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

  o Cisco would like to thank Adrien Peter of Synacktiv for reporting this
    vulnerability.

Cisco Security Vulnerability Policy

  o 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.

Related to This Advisory

  o Cisco Event Response: February 2021 Cisco FXOS and NX-OS Software Security
    Advisory Bundled Publication

URL

  o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-n9kaci-unauth-access-5PWzDx2w

Revision History

  o +----------+---------------------------+----------+--------+--------------+
    | Version  |        Description        | Section  | Status |     Date     |
    +----------+---------------------------+----------+--------+--------------+
    | 1.0      | Initial public release.   | -        | Final  | 2021-FEB-24  |
    +----------+---------------------------+----------+--------+--------------+


- --------------------------------------------------------------------------------


Cisco Nexus 9000 Series Fabric Switches ACI Mode Link Layer Discovery Protocol
Port Denial of Service Vulnerability

Priority:        Medium
Advisory ID:     cisco-sa-apic-lldap-dos-WerV9CFj
First Published: 2021 February 24 16:00 GMT
Version 1.0:     Final
Workarounds:     No workarounds available
Cisco Bug IDs:   CSCvu84570
CVE Names:       CVE-2021-1231
CWEs:            CWE-284

Summary

  o A vulnerability in the Link Layer Discovery Protocol (LLDP) for Nexus 9000
    Series Fabric Switches in Application Centric Infrastructure (ACI) mode
    could allow an unauthenticated, adjacent attacker to disable switching on a
    small form-factor pluggable (SFP) interface.

    This vulnerability is due to incomplete validation of the source of a
    received LLDP packet. An attacker could exploit this vulnerability by
    sending a crafted LLDP packet on an SFP interface to an affected device. A
    successful exploit could allow the attacker to disable switching on the SFP
    interface, which could disrupt network traffic.

    Cisco has released software updates that address this vulnerability. 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-apic-lldap-dos-WerV9CFj

Affected Products

  o Vulnerable Products

    At the time of publication, this vulnerability affected Cisco Nexus 9000
    Series Fabric Switches in ACI mode if they had an SFP interface installed.

    For information about which Cisco software releases are vulnerable, see the
    Fixed Software section of this advisory.

    Determine Whether an SFP Interface Is Installed

    To determine whether an SPF interface is installed on a device, use the
    show interface brief | grep SFP CLI command. If this command returns
    output, then the device has at least one SFP interface installed. The
    following example shows the output on a device that has the SFP interface
    installed:

        nxos# show interface brief | grep SFP
        .
        .
        .
            type is QSFP-100G-AOC5M

    Products Confirmed Not Vulnerable

    Only products listed in the Vulnerable Products section of this advisory
    are known to be affected by this vulnerability.

    Cisco has confirmed that this vulnerability does not affect the following
    Cisco products:

       Firepower 1000 Series
       Firepower 2100 Series
       Firepower 4100 Series
       Firepower 9300 Security Appliances
       MDS 9000 Series Multilayer Switches
       Nexus 1000 Virtual Edge for VMware vSphere
       Nexus 1000V Switch for Microsoft Hyper-V
       Nexus 1000V Switch for VMware vSphere
       Nexus 3000 Series Switches
       Nexus 5500 Platform Switches
       Nexus 5600 Platform Switches
       Nexus 6000 Series Switches
       Nexus 7000 Series Switches
       Nexus 9000 Series Switches in standalone NX-OS mode
       UCS 6200 Series Fabric Interconnects
       UCS 6300 Series Fabric Interconnects
       UCS 6400 Series Fabric Interconnects

Workarounds

  o There are no workarounds that address this vulnerability.

Fixed Software

  o When considering software upgrades , customers are advised to regularly
    consult the advisories for Cisco products, which are available from the
    Cisco Security Advisories 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.

    Cisco NX-OS Software

    To help customers determine their exposure to vulnerabilities in Cisco
    NX-OS Software, Cisco provides the Cisco Software Checker to identify any
    Cisco Security Advisories that impact a specific Cisco NX-OS Software
    release and the earliest release that fixes the vulnerabilities that are
    described in each advisory ("First Fixed"). If applicable, the tool also
    returns the earliest release that fixes all the vulnerabilities described
    in all the advisories identified ("Combined First Fixed").

    Customers can use the Cisco Software Checker to search advisories in the
    following ways:

       Choose the software, platform, and one or more releases
       Upload a .txt file that includes a list of specific releases
       Enter the output of the show version command

    After initiating a search, customers can customize the search to include
    all Cisco Security Advisories or one or more specific advisories.

    Customers can also use the following form to determine whether a release is
    affected by any Cisco Security Advisory by choosing the Cisco NX-OS
    Software and platform and then entering a release-for example, 7.0(3)I7(5) 
    for Cisco Nexus 3000 Series Switches or 14.0(1h) for Cisco NX-OS Software
    in ACI mode.

    By default, the Cisco Software Checker includes results only for
    vulnerabilities that have a Critical or High Security Impact Rating (SIR).
    To include results for Medium SIR vulnerabilities, customers can use the
    Cisco Software Checker and check the Medium check box in the drop-down list
    under Impact Rating when customizing a search.

    Additional Resources

    For help determining the best Cisco NX-OS Software release for a Cisco
    Nexus Switch, see 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 Switches
        Cisco Nexus 5500 Platform Switches
        Cisco Nexus 5600 Platform Switches
        Cisco Nexus 6000 Series Switches
        Cisco Nexus 7000 Series Switches
        Cisco Nexus 9000 Series Switches
        Cisco Nexus 9000 Series ACI-Mode Switches

    To determine the best release for Cisco UCS Software, see the Recommended
    Releases documents in the release notes for the device.

Exploitation and Public Announcements

  o 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

  o Cisco would like to thank Adrien Peter of Synacktiv for reporting this
    vulnerability.

Cisco Security Vulnerability Policy

  o 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.

URL

  o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apic-lldap-dos-WerV9CFj

Revision History

  o +----------+---------------------------+----------+--------+--------------+
    | Version  |        Description        | Section  | Status |     Date     |
    +----------+---------------------------+----------+--------+--------------+
    | 1.0      | Initial public release.   | -        | Final  | 2021-FEB-24  |
    +----------+---------------------------+----------+--------+--------------+

- --------------------------END INCLUDED TEXT--------------------

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