ESB-2019.0701.2 - UPDATE [Cisco] Cisco Nexus 9000 Switches: Multiple vulnerabilities 2019-03-20

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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                              ESB-2019.0701.2
         Cisco Nexus 9000 Series Switches Multiple Vulnerabilities
                               20 March 2019

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

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

Product:           Cisco Nexus 9000 Switches
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Root Compromise   -- Existing Account      
                   Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-1618 CVE-2019-1617 CVE-2019-1591

Original Bulletin: 
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190306-tetra-ace
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190306-nxos-npv-dos
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190306-aci-shell-escape

Revision History:  March 20 2019: Updated cisco-sa-20190306-aci-shell-escape
                   March  7 2019: Initial Release

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

Cisco Nexus 9000 Series Switches Standalone NX-OS Mode Tetration Analytics
Agent Arbitrary Code Execution Vulnerability

Priority:        High

Advisory ID:     cisco-sa-20190306-tetra-ace

First Published: 2019 March 6 16:00 GMT

Version 1.0:     Final

Workarounds:     No workarounds available

Cisco Bug IDs:   CSCvh21898

CVE-2019-1618    

CWE-275

CVSS Score:
7.8  AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:X/RL:X/RC:X

Summary

  o A vulnerability in the Tetration Analytics agent for Cisco Nexus 9000
    Series Switches in standalone NX-OS mode could allow an authenticated,
    local attacker to execute arbitrary code as root .

    The vulnerability is due to an incorrect permissions setting. An attacker
    could exploit this vulnerability by replacing valid agent files with
    malicious code. A successful exploit could result in the execution of code
    supplied by the attacker.

    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-20190306-tetra-ace

    This advisory is part of the March 2019 Cisco FXOS and NX-OS Software
    Security Advisory Bundled Publication, which includes 25 Cisco Security
    Advisories that describe 26 vulnerabilities. For a complete list of the
    advisories and links to them, see Cisco Event Response: March 2019 Cisco
    FXOS and NX-OS Software Security Advisory Bundled Publication .

Affected Products

  o Vulnerable Products

    This vulnerability affects Cisco Nexus 9000 Series Switches in standalone
    NX-OS mode that are running a vulnerable release of Cisco NX-OS Software.

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

    Note: Only affected devices with Feature Analytics enabled are vulnerable.
    To verify whether Feature Analytics is enabled, administrators can execute
    the show feature CLI command. The following example shows the output of
    this command on a device with this feature disabled:

        N9K-A# show feature

        Feature Name          Instance  State
        --------------------  --------  --------
        analytics             1         disabled

    Determining the Cisco NX-OS Software Release

    Administrators can check the release of Cisco NX-OS Software that is
    running on a device by using the show version command in the device CLI.
    The following example shows the output of this command on a device that is
    running Cisco NX-OS Software Release 7.0(3)I5(1) :

        nxos-switch# show version
        Cisco Nexus Operating System (NX-OS) Software
        TAC support: http://www.cisco.com/tac
        Copyright (C) 2002-2016, Cisco and/or its affiliates.
        All rights reserved.
        The copyrights to certain works contained in this software are
        owned by other third parties and used and distributed under their own
        licenses, such as open source.  This software is provided "as is," and
        unless otherwise stated, there is no warranty, express or implied,
        including but not limited to warranties of merchantability and fitness
        for a particular purpose. Certain components of this software are
        licensed under the GNU General Public License (GPL) version 2.0 or
        GNU General Public License (GPL) version 3.0  or the GNU
        Lesser General Public License (LGPL) Version 2.1 or
        Lesser General Public License (LGPL) Version 2.0.
        A copy of each such license is available at
        http://www.opensource.org/licenses/gpl-2.0.php and
        http://opensource.org/licenses/gpl-3.0.html and
        http://www.opensource.org/licenses/lgpl-2.1.php and
        http://www.gnu.org/licenses/old-licenses/library.txt.
        Software
          BIOS: version 07.57
          NXOS: version 7.0(3)I5(1) [build 7.0(3)I5(0.9)]
          BIOS compile time:  06/29/2016
          NXOS image file is: bootflash:///nxos.7.0.3.I5.0.9.bin
          NXOS compile time:  8/1/2016 23:00:00 [08/02/2016 00:30:32]
          .
          .
          .

    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 2100 Series Firewalls
       Firepower 4100 Series Next-Generation Firewalls
       Firepower 9300 Security Appliance
       MDS 9000 Series Multilayer Switches
       Nexus 1000V Switch for Microsoft Hyper-V
       Nexus 1000V Switch for VMware vSphere
       Nexus 2000 Series Fabric Extenders
       Nexus 3000 Series Switches
       Nexus 3500 Platform Switches
       Nexus 3600 Platform Switches
       Nexus 5500 Platform Switches
       Nexus 5600 Platform Switches
       Nexus 6000 Series Switches
       Nexus 7000 Series Switches
       Nexus 7700 Series Switches
       Nexus 9000 Series Fabric Switches in Application Centric Infrastructure
        (ACI) mode
       Nexus 9500 R-Series Line Cards and Fabric Modules
       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 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

    Nexus 9000 Series Switches in Standalone NX-OS Mode: CSCvh21898

    Cisco NX-OS    First Fixed Release  First Fixed Release for All
    Software       for This             Vulnerabilities Described in the Bundle
    Release        Vulnerability        of Advisories
    Prior to 7.0   Not vulnerable       7.0(3)I7(6)
    (3)I4
    7.0(3)I4       7.0(3)I7(5)          7.0(3)I7(6)
    7.0(3)I5       7.0(3)I7(5)          7.0(3)I7(6)
    7.0(3)I6       7.0(3)I7(5)          7.0(3)I7(6)
    7.0(3)I7       7.0(3)I7(5)          7.0(3)I7(6)
    9.2            Not vulnerable       9.2(2)


    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.

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 internal security testing.

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: March 2019 Cisco FXOS and NX-OS Software Security
    Advisory Bundled Publication

URL

  o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
    cisco-sa-20190306-tetra-ace

Revision History

  o +---------+--------------------------+---------+--------+----------------+
    | Version |       Description        | Section | Status |      Date      |
    +---------+--------------------------+---------+--------+----------------+
    | 1.0     | Initial public release.  | -       | Final  | 2019-March-06  |
    +---------+--------------------------+---------+--------+----------------+

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

Cisco Nexus 9000 Series Switches Standalone NX-OS Mode Fibre Channel over
Ethernet NPV Denial of Service Vulnerability

Priority:        High

Advisory ID:     cisco-sa-20190306-nxos-npv-dos

First Published: 2019 March 6 16:00 GMT

Version 1.0:     Final

Workarounds:     No workarounds available

Cisco Bug IDs:   CSCvk44504

CVE-2019-1617    

CWE-913

CVSS Score:
7.4  AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:X/RL:X/RC:X

Summary

  o A vulnerability in the Fibre Channel over Ethernet (FCoE) N-port
    Virtualization (NPV) protocol implementation in Cisco NX-OS Software could
    allow an unauthenticated, adjacent attacker to cause a denial of service
    (DoS) condition.

    The vulnerability is due to an incorrect processing of FCoE packets when
    the fcoe-npv feature is uninstalled. An attacker could exploit this
    vulnerability by sending a stream of FCoE frames from an adjacent host to
    an affected device. An exploit could allow the attacker to cause packet
    amplification to occur, resulting in the saturation of interfaces and a DoS
    condition.

    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-20190306-nxos-npv-dos

    This advisory is part of the March 2019 Cisco FXOS and NX-OS Software
    Security Advisory Bundled Publication, which includes 25 Cisco Security
    Advisories that describe 26 vulnerabilities. For a complete list of the
    advisories and links to them, see Cisco Event Response: March 2019 Cisco
    FXOS and NX-OS Software Security Advisory Bundled Publication .

Affected Products

  o Vulnerable Products

    This vulnerability affects the following Cisco products if they are running
    a vulnerable release of Cisco NX-OS Software:

       Nexus 9000 Series Switches in standalone NX-OS mode

    Only the following Nexus 9000 Series PIDs are vulnerable:

       N9K-C92160YC-X
       N9K-C9272Q
       N9K-C9236C
       N9K-C93180YC-EX
       N9K-X9732C-EX
       N9K-C93180LC-EX
       N9K-C93180YC-FX
       N9K-X9736C-FX

    To view the PIDs of the system, use the show inventory CLI command:

        9K-A# show inventory
        NAME: "Chassis",  DESCR: "Nexus9000 C93128TX Chassis"
        PID: N9K-C93128TX        ,  VID: V02 ,  SN: SAL1822TF13

        NAME: "Slot 1",  DESCR: "1/10G-T Ethernet Module"
        PID: N9K-C93128TX        ,  VID: V02 ,  SN: SAL1822TF13

        NAME: "Slot 2",  DESCR: "40G Ethernet Expansion Module"
        PID: N9K-M12PQ           ,  VID: V01 ,  SN: SAL1910AMHD

    Note: For this vulnerability to occur, all of the following conditions must
    be met:

       The affected devices are configured as vPC peer switches.
       The fcoe-npv feature must be uninstalled.

    See Details for more information.

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

    Determining the Cisco NX-OS Software Release

    Administrators can check the release of Cisco NX-OS Software that is
    running on a device by using the show version command in the device CLI.
    The following example shows the output of this command on a device that is
    running Cisco NX-OS Software Release 7.0(3)I5(1) :

        nxos-switch# show version
        Cisco Nexus Operating System (NX-OS) Software
        TAC support: http://www.cisco.com/tac
        Copyright (C) 2002-2016, Cisco and/or its affiliates.
        All rights reserved.
        The copyrights to certain works contained in this software are
        owned by other third parties and used and distributed under their own
        licenses, such as open source.  This software is provided "as is," and
        unless otherwise stated, there is no warranty, express or implied,
        including but not limited to warranties of merchantability and fitness
        for a particular purpose. Certain components of this software are
        licensed under the GNU General Public License (GPL) version 2.0 or
        GNU General Public License (GPL) version 3.0  or the GNU
        Lesser General Public License (LGPL) Version 2.1 or
        Lesser General Public License (LGPL) Version 2.0.
        A copy of each such license is available at
        http://www.opensource.org/licenses/gpl-2.0.php and
        http://opensource.org/licenses/gpl-3.0.html and
        http://www.opensource.org/licenses/lgpl-2.1.php and
        http://www.gnu.org/licenses/old-licenses/library.txt.
        Software
          BIOS: version 07.57
          NXOS: version 7.0(3)I5(1) [build 7.0(3)I5(0.9)]
          BIOS compile time:  06/29/2016
          NXOS image file is: bootflash:///nxos.7.0.3.I5.0.9.bin
          NXOS compile time:  8/1/2016 23:00:00 [08/02/2016 00:30:32]
          .
          .
          .


    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 2100 Series
       Firepower 4100 Series Next-Generation Firewall
       Firepower 9300 Security Appliance
       MDS 9000 Series Multilayer Switches
       Nexus 1000V Switch for Microsoft Hyper-V
       Nexus 1000V Switch for VMware vSphere
       Nexus 2000 Series Fabric Extenders
       Nexus 3000 Series Switches
       Nexus 3500 Platform Switches
       Nexus 3600 Platform Switches
       Nexus 5500 Platform Switches
       Nexus 5600 Platform Switches
       Nexus 6000 Series Switches
       Nexus 7000 Series Switches
       Nexus 7700 Series Switches
       Nexus 9000 Series Fabric Switches in Application Centric Infrastructure
        (ACI) mode
       Nexus 9500 R-Series Line Cards and Fabric Modules
       UCS 6200 Series Fabric Interconnects
       UCS 6300 Series Fabric Interconnects
       UCS 6400 Series Fabric Interconnects

Details

  o The affected devices are vulnerable when configured as outlined in the
    Vulnerable Products section. The following commands will help identify
    these conditions:

    To verify the status of a vPC configuration, use the show vpc brief CLI
    command:

        9K-A# show vpc brief
        Legend:
                        (*) - local vPC is down, forwarding via vPC peer-link

        vPC domain id                     : 10
        Peer status                       : peer adjacency formed ok
        vPC keep-alive status             : peer is alive
        Configuration consistency status  : success
        Per-vlan consistency status       : success
        Type-2 inconsistency reason       : Consistency Check Not Performed
        vPC role                          : primary
        Number of vPCs configured         : 1
        Peer Gateway                      : Enabled
        Dual-active excluded VLANs        : -
        Graceful Consistency Check        : Enabled
        Auto-recovery status              : Disabled
        Delay-restore status              : Timer is off.(timeout = 30s)
        Delay-restore SVI status          : Timer is off.(timeout = 10s)

        vPC Peer-link status
        ---------------------------------------------------------------------
        id   Port   Status Active vlans
        --   ----   ------ --------------------------------------------------
        1    Po1    up     1

        vPC status
        ----------------------------------------------------------------------
        id   Port   Status Consistency Reason                     Active vlans
        --   ----   ------ ----------- ------                     ------------
        10   Po10   up     success     success                    1

    To verify the status of the fcoe-npv feature, use the show feature-set CLI
    command:

        9K-A# show feature-set

        Feature Set Name      ID        State
        --------------------  --------  --------
        fex                    3          uninstalled
        mpls                   4          uninstalled
        fabric                 7          uninstalled
        fcoe-npv               8          uninstalled

Indicators of Compromise

  o If the devices are configured as outlined in the Vulnerable Products 
    section, a possible indicator of compromise would be a relativity low Rx
    input rate, except for the vPC peer link, coupled with a high Tx rate for
    all enabled interfaces on the vPC pair of affected Nexus 9000 Series
    Switches.

    To see interface throughput statistics, use the show interface counter
    table CLI command: (egrep -v "0.0 0.0% 0.0 0.0%", excludes interfaces with
    zero statistics for Rx and Tx columns)

        9K-A# sh int counter table | egrep -v "0.0      0.0%     0.0      0.0%"

        Collecting and processing interface statistics ...

        ------------------------------------------------------------------------
        Port            Description     Intvl    Rx Mbps  Rx %    Tx Mbps  Tx %
        ------------------------------------------------------------------------
        Ethernet1/49    vPC_Peer_Link   30/30    36078.7  90.2%   36078.7  90.2%
        Ethernet1/50/1  N/A             30/30    2.5      0.0%    9019.6   90.2%
        Ethernet1/50/2  N/A             30/30    0.0      0.0%    9019.6   90.2%
        port-channel36  N/A             30/30    2.5      0.0%    9019.6   90.2%
        port-channel100 vPC_Peer_Link   30/30    36078.7  90.2%   36078.7  90.2%

        9K-B# sh int counter table | egrep -v "0.0      0.0%     0.0      0.0%"

          Collecting and processing interface statistics ...

        -------------------------------------------------------------------------
        Port            Description      Intvl    Rx Mbps  Rx %    Tx Mbps  Tx %
        -------------------------------------------------------------------------
        Ethernet1/49    vPC_Peer_Link    30/30    36078.3  90.2%   36078.3  90.2%
        Ethernet1/50/1  N/A              30/30    0.0      0.0%    9019.6   90.2%
        port-channel36  N/A              30/30    0.0      0.0%    9019.6   90.2%
        port-channel100 vPC_Peer_Link    30/30    36078.3  90.2%   36078.3  90.2%

    Another potential indication would be output discards. To check for output
    discards, use the show interface counter errors non-zero CLI command:

        9K-A# sh int counter errors non-zero

        -------------------------------------------------------------------------
        Port        Align-Err   FCS-Err  Xmit-Err  Rcv-Err  UnderSize OutDiscards
        -------------------------------------------------------------------------
        Eth1/49             0         0         0        0          0      426242
        Eth1/50/1           0         0         0        0          0  9916163951
        Eth1/50/2           0         0         0        0          0  9934560747
        Po36                0         0         0        0          0  9916163951
        Po100               0         0         0        0          0      426242

        9K-B# sh int counter errors non-zero

        -------------------------------------------------------------------------
        Port        Align-Err   FCS-Err  Xmit-Err  Rcv-Err  UnderSize OutDiscards
        -------------------------------------------------------------------------
        Eth1/50/1           0         0         0        0          0  9915689573
        Po36                0         0         0        0          0  9915689573

    If there are any questions regarding the output of your device or the
    information above, please contact Cisco TAC:
    https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html

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 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

    Nexus 9000 Series Switches in Standalone NX-OS Mode: CSCvk44504


    Cisco NX-OS    First Fixed Release  First Fixed Release for All
    Software       for This             Vulnerabilities Described in the Bundle
    Release        Vulnerability        of Advisories
    Prior to 7.0   Not vulnerable       7.0(3)I7(6)
    (3)I4
    7.0(3)I4       Not vulnerable       7.0(3)I7(6)
    7.0(3)I5       7.0(3)I7(5)          7.0(3)I7(6)
    7.0(3)I6       7.0(3)I7(5)          7.0(3)I7(6)
    7.0(3)I7       7.0(3)I7(5)          7.0(3)I7(6)
    9.2            9.2(2)               9.2(2)


    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.

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: March 2019 Cisco FXOS and NX-OS Software Security
    Advisory Bundled Publication

URL

  o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
    cisco-sa-20190306-nxos-npv-dos

Revision History

  o +---------+--------------------------+---------+--------+----------------+
    | Version |       Description        | Section | Status |      Date      |
    +---------+--------------------------+---------+--------+----------------+
    | 1.0     | Initial public release.  | -       | Final  | 2019-March-06  |
    +---------+--------------------------+---------+--------+----------------+

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

Cisco Nexus 9000 Series Fabric Switches Application Centric Infrastructure Mode
Shell Escape Vulnerability

Priority:        High

Advisory ID:     cisco-sa-20190306-aci-shell-escape

First Published: 2019 March 6 16:00 GMT

Last Updated:    2019 March 19 21:08 GMT

Version 1.1:     Final

Workarounds:     No workarounds availableCisco Bug IDs:   CSCvm52063

CVE-2019-1591    

CWE-264

CVSS Score:
7.8  AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:X/RL:X/RC:X

Summary

  o A vulnerability in a specific CLI command implementation of Cisco Nexus
    9000 Series ACI Mode Switch Software could allow an authenticated, local
    attacker to escape a restricted shell on an affected device.

    The vulnerability is due to insufficient sanitization of user-supplied
    input when issuing a specific CLI command with parameters on an affected
    device. An attacker could exploit this vulnerability by authenticating to
    the device CLI and issuing certain commands. A successful exploit could
    allow the attacker to escape the restricted shell and execute arbitrary
    commands with root -level privileges on the affected device.

    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-20190306-aci-shell-escape

    This advisory is part of the March 2019 Cisco FXOS and NX-OS Software
    Security Advisory Bundled Publication, which includes 25 Cisco Security
    Advisories that describe 26 vulnerabilities. For a complete list of the
    advisories and links to them, see Cisco Event Response: March 2019 Cisco
    FXOS and NX-OS Software Security Advisory Bundled Publication .

Affected Products

  o Vulnerable Products

    This vulnerability only affects Cisco Nexus 9000 Series ACI Mode Switches
    that are running a release prior to 13.2(4d).

    Determining the Cisco NX-OS Software Release

    Administrators can determine the release of Cisco NX-OS Software running on
    a device by using the show version command in the device CLI. The following
    example identifies the 11.2(2) Release:

        nxos-n9k-aci# show version
        Cisco Nexus Operating System (NX-OS) Software
        such license is available at
        http://www.opensource.org/licenses/gpl-2.0.php and http://www.opensource.org/licenses/lgpl-2.1.php
        Software
        BIOS:      version N/A
        kickstart: version 11.2(2) [build 11.2(1.184)]
        system:    version 11.2(2) [build 11.2(1.184)]
        .
        .
        .

    Determining the Cisco Application Policy Infrastructure Controller Software
    Release

    There is a one-to-one mapping between the software for Cisco Application
    Policy Infrastructure Controller (APIC) and Cisco Nexus 9000 Series Fabric
    Switches in ACI mode. To determine which Cisco APIC Software release is
    running on a device, administrators can disregard the leftmost digit of the
    Cisco NX-OS Software version number. In the preceding example, the output
    shows Cisco NX-OS Software version 11.2(2) , which maps to Cisco APIC
    Software Release 1.2(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 determined that this vulnerability does not affect the following
    Cisco products:

       Firepower 2100 Series Firewalls
       Firepower 4100 Series Next-Generation Firewalls
       Firepower 9300 Security Appliance
       MDS 9000 Series Multilayer Director Switches
       Nexus 1000V Switch for Microsoft Hyper-V
       Nexus 1000V Switch for VMware vSphere
       Nexus 2000 Series Fabric Extenders
       Nexus 3000 Series Switches
       Nexus 3500 Platform Switches
       Nexus 3600 Platform Switches
       Nexus 5000 Series Switches
       Nexus 5500 Platform Switches
       Nexus 5600 Platform Switches
       Nexus 7000 Series Switches
       Nexus 7700 Series Switches
       Nexus 9000 Series Switches in standalone NX-OS mode
       Nexus 9500 R-Series Line Cards and Fabric Modules
       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 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

    This vulnerability is fixed in Cisco Nexus 9000 Series ACI Mode Switch
    Software Releases 13.2(4d) and later.

    The recommended action for all Cisco customers running a device with an
    affected version is to upgrade to the latest maintenance or latest
    long-lived version. Cisco suggests that customers visit the following page
    to determine what fixed release to choose: https://www.cisco.com/c/en/us/td
    /docs/switches/datacenter/aci/apic/sw/recommended-release/
    b_Recommended_Cisco_ACI_Releases.html .

    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.

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 Nicolas Biscos and Gaetan Ferry from 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: March 2019 Cisco FXOS and NX-OS Software Security
    Advisory Bundled Publication

URL

  o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
    cisco-sa-20190306-aci-shell-escape

Revision History

  o +---------+-------------------+------------------+--------+---------------+
    | Version |    Description    |     Section      | Status |     Date      |
    +---------+-------------------+------------------+--------+---------------+
    |         | Updated first     | Vulnerable       |        |               |
    | 1.1     | fixed software    | Products, Fixed  | Final  | 2019-March-19 |
    |         | release.          | Software         |        |               |
    +---------+-------------------+------------------+--------+---------------+
    | 1.0     | Initial public    | -                | Final  | 2019-March-06 |
    |         | release.          |                  |        |               |
    +---------+-------------------+------------------+--------+---------------+

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

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