ESB-2018.0899.4 - UPDATE [Cisco] Cisco IOS and Cisco IOS XE: Multiple vulnerabilities 2018-04-17

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

                              ESB-2018.0899.4
        Cisco IOS and IOS XE Software Smart Install Vulnerabilities
                               17 April 2018

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

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

Product:           Cisco IOS
                   Cisco IOS XE
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
                   Denial of Service               -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-0171 CVE-2018-0156 

Original Bulletin: 
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-smi
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-smi2

Comment: This bulletin contains two (2) Cisco Systems security advisories.

Revision History:  April 17 2018: Updated IOS Software Checker with 
                                  products found to be non-vulnerable.
                   April 12 2018: Added link to list of devices that support 
                                  Smart Install.
                   April  9 2018: Update from Cisco: Added more details to the 
                                  Workarounds section, metadata update
                   March 29 2018: Initial Release

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

Cisco IOS and IOS XE Software Smart Install Denial of Service Vulnerability

High
Advisory ID: 
cisco-sa-20180328-smi
First Published: 
2018 March 28 16:00 GMT
Last Updated: 
2018 April 16 18:25 GMT
Version 1.4: 
Final
Workarounds: 
No workarounds available
Cisco Bug IDs: CSCvd40673
 
CVE-2018-0156
 
CWE-399
 
CVSS Score:
Base 8.6[blue-squar]Click Icon to Copy Verbose Score
CVSS:3.0/AV:N/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 Smart Install feature of Cisco IOS Software and
    Cisco IOS XE Software could allow an unauthenticated, remote attacker to
    trigger a reload of an affected device, resulting in a denial of service 
    (DoS) condition.

    The vulnerability is due to improper validation of packet data. An attacker
    could exploit this vulnerability by sending a crafted packet to an affected
    device on TCP port 4786.

    Cisco has released software updates that address this vulnerability. There
    are no workarounds that address this vulnerability.

    Smart Install client functionality is enabled by default on switches that
    are running Cisco IOS Software releases that have not been updated to
    address Cisco bug ID CSCvd36820.

    This advisory is available at the following link:
    https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
    cisco-sa-20180328-smi

    This advisory is part of the March 28, 2018, release of the Cisco IOS and
    IOS XE Software Security Advisory Bundled Publication, which includes 20
    Cisco Security Advisories that describe 22 vulnerabilities. For a complete
    list of the advisories and links to them, see Cisco Event Response: March
    2018 Semiannual Cisco IOS and IOS XE Software Security Advisory Bundled
    Publication.

Affected Products

  o Vulnerable Products

    This vulnerability affects Cisco devices that are running a vulnerable
    release of Cisco IOS or IOS XE Software and have the Smart Install client
    feature enabled.

    Only Smart Install client switches are affected by the vulnerability that
    is described in this advisory. Cisco devices that are configured as a Smart
    Install director are not affected by this vulnerability.  

    For a list of devices that support Smart Install, see Smart Install
    Configuration Guide - Supported Devices.

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

    Notes Regarding Specific Releases

    Smart Install client functionality is enabled by default on switches that
    are running Cisco IOS Software releases that have not been updated to
    address Cisco bug ID CSCvd36820.

    Switches that are running releases earlier than Cisco IOS Software Release
    12.2(52)SE are not capable of running Smart Install, but they can be Smart
    Install clients if they support the archive download-sw privileged EXEC
    command.

    Determining Whether the Smart Install Client Feature Is Enabled

    To determine whether a device is configured with the Smart Install client
    feature enabled, use the show vstack config privileged EXEC command on the
    Smart Install client. An output of Role: Client and Oper Mode: Enabled or
    Role: Client (SmartInstall enabled) from the show vstack config command
    confirms that the feature is enabled on the device.

    The following examples show the output of the show vstack config command on
    Cisco Catalyst Switches that are configured as Smart Install clients:

        switch1# show vstack config
         Role: Client (SmartInstall enabled)
         .
         .
         .

        switch2# show vstack config
         Capability: Client
         Oper Mode: Enabled
         Role: Client
         .
         .
         .

    Determining the Cisco IOS Software Release

    To determine which Cisco IOS Software release is running on a device,
    administrators can log in to the device, use the show version command in
    the CLI, and then refer to the system banner that appears. If the device is
    running Cisco IOS Software, the system banner displays text similar to
    Cisco Internetwork Operating System Software or Cisco IOS Software. The
    banner also displays the installed image name in parentheses, followed by
    the Cisco IOS Software release number and release name. Some Cisco devices
    do not support the show version command or may provide different output.

    The following example shows the output of the command for a device that is
    running Cisco IOS Software Release 15.5(2)T1 and has an installed image
    name of C2951-UNIVERSALK9-M:

        Router> show version

        Cisco IOS Software, C2951 Software (C2951-UNIVERSALK9-M), Version 15.5(2)T1, RELEASE SOFTWARE (fc1)
        Technical Support: http://www.cisco.com/techsupport
        Copyright (c) 1986-2015 by Cisco Systems, Inc.
        Compiled Mon 22-Jun-15 09:32 by prod_rel_team
        .
        .
        .

    For information about the naming and numbering conventions for Cisco IOS
    Software releases, see the Cisco IOS and NX-OS Software Reference Guide.

    Determining the Cisco IOS XE Software Release

    To determine which Cisco IOS XE Software release is running on a device,
    administrators can log in to the device, use the show version command in
    the CLI, and then refer to the system banner that appears. If the device is
    running Cisco IOS XE Software, the system banner displays Cisco IOS
    Software, Cisco IOS XE Software, or similar text.

    The following example shows the output of the command for a device that is
    running Cisco IOS XE Software Release 16.2.1 and has an installed image
    name of CAT3K_CAA-UNIVERSALK9-M:

        ios-xe-device# show version

        Cisco IOS Software, Catalyst L3 Switch Software (CAT3K_CAA-UNIVERSALK9-M), Version Denali 16.2.1, RELEASE SOFTWARE (fc1)
        Technical Support: http://www.cisco.com/techsupport
        Copyright (c) 1986-2016 by Cisco Systems, Inc.
        Compiled Sun 27-Mar-16 21:47 by mcpre
        .
        .
        .

    For information about the naming and numbering conventions for Cisco IOS XE
    Software releases, see the Cisco IOS and NX-OS Software Reference Guide.

    Products Confirmed Not Vulnerable

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

    Cisco has confirmed that this vulnerability does not affect Cisco IOS XR
    Software or Cisco NX-OS Software.

Details

  o Cisco Smart Install is a "plug-and-play" configuration and image-management
    feature that provides zero-touch deployment for new (typically access
    layer) switches. The feature allows a customer to ship a Cisco switch to
    any location, install it in the network, and power it on without additional
    configuration requirements. The Smart Install feature incorporates no
    authentication by design.

    A Smart Install network consists of exactly one Smart Install director
    switch or router, also known as an integrated branch director (IBD), and
    one or more Smart Install client switches, also known as integrated branch
    clients (IBCs). A client switch does not need to be directly connected to
    the director; the client switch can be up to seven hops away.

    The director provides a single management point for images and
    configuration of client switches. When a client switch is first installed
    in the network, the director automatically detects the new switch and
    identifies the correct Cisco IOS Software image and the configuration file
    for downloading. The director can also allocate an IP address and hostname
    to a client.

Workarounds

  o There are no workarounds that address this vulnerability for customers who
    require the use of Cisco Smart Install. For customers not requiring Cisco
    Smart Install, the feature can be disabled with the no vstack command. In
    software releases that are associated with Cisco Bug ID CSCvd36820, Cisco
    Smart Install will auto-disable if not in use.

    Administrators are encouraged to consult the informational security
    advisory on Cisco Smart Install Protocol Misuse and the Smart Install
    Configuration Guide.

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.

    Cisco IOS and IOS XE Software

    To help customers determine their exposure to vulnerabilities in Cisco IOS
    and IOS XE Software, Cisco provides a tool, the Cisco IOS Software Checker,
    that identifies any Cisco Security Advisories that impact a specific
    software release and the earliest release that fixes the vulnerabilities
    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 this tool to perform the following tasks:

      ? Initiate a search by choosing one or more releases from a drop-down
        list or uploading a file from a local system for the tool to parse
      ? Enter the output of the show version command for the tool to parse
      ? Create a custom search by including all previously published Cisco
        Security Advisories, a specific advisory, or all advisories in the most
        recent bundled publication

    To determine whether a release is affected by any published Cisco Security
    Advisory, use the Cisco IOS Software Checker on Cisco.com or enter a
    Cisco IOS Software or Cisco IOS XE Software release--for example, 15.1(4)M2
    or 3.13.8S--in the following field:

    [                    ] [Check]

    For a mapping of Cisco IOS XE Software releases to Cisco IOS Software
    releases, refer to the Cisco IOS XE 2 Release Notes, Cisco IOS XE 3S
    Release Notes, or Cisco IOS XE 3SG Release Notes, depending on the
    Cisco IOS XE Software release.

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.

Subscribe to Cisco Security Notifications

  o Subscribe

Action Links for This Advisory

  o Snort Rule 41725

Related to This Advisory

  o Cisco Event Response: March 2018 Semiannual Cisco IOS and IOS XE Software
    Security Advisory Bundled Publication
    Cisco Security Blog: Cisco IOS and IOS XE Software Bundled Publication
    March 2018

URL

  o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
    cisco-sa-20180328-smi

Revision History

    +---------+----------------------------+-------------+--------+---------------+
    | Version |        Description         |   Section   | Status |     Date      |
    +---------+----------------------------+-------------+--------+---------------+
    |         | Updated IOS Software       |             |        |               |
    | 1.4     | Checker with products      | --          | Final  | 2018-April-16 |
    |         | found to be                |             |        |               |
    |         | non-vulnerable.            |             |        |               |
    +---------+----------------------------+-------------+--------+---------------+
    |         | Emphasized that Smart      |             |        |               |
    |         | Install is enabled by      | Summary and |        |               |
    | 1.3     | default. Added a link to   | Affected    | Final  | 2018-April-09 |
    |         | the list of devices that   | Products    |        |               |
    |         | support Smart Install.     |             |        |               |
    +---------+----------------------------+-------------+--------+---------------+
    | 1.2     | Added more details to the  | Workarounds | Final  | 2018-April-06 |
    |         | Workarounds section.       |             |        |               |
    +---------+----------------------------+-------------+--------+---------------+
    | 1.1     | Metadata update.           | --          | Final  | 2018-April-02 |
    +---------+----------------------------+-------------+--------+---------------+
    | 1.0     | Initial public release.    | --          | Final  | 2018-March-28 |
    +---------+----------------------------+-------------+--------+---------------+


Legal Disclaimer

  o THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND
    OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR
    FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT
    OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES
    THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.

    A standalone copy or paraphrase of the text of this document that omits the
    distribution URL is an uncontrolled copy and may lack important information
    or contain factual errors. The information in this document is intended for
    end users of Cisco products.

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

Cisco IOS and IOS XE Software Smart Install Remote Code Execution Vulnerability

Critical
Advisory ID:
cisco-sa-20180328-smi2
First Published:
2018 March 28 16:00 GMT
Last Updated: 
2018 April 16 18:21 GMT
Version 1.5:
Final
Workarounds:
No workarounds available
Cisco Bug IDs:
CSCvg76186
 
CVE-2018-0171
 
CWE-20
 
CVSS Score:
Base 9.8
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:X/RL:X/RC:X

Summary

  o A vulnerability in the Smart Install feature of Cisco IOS Software and
    Cisco IOS XE Software could allow an unauthenticated, remote attacker to
    trigger a reload of an affected device, resulting in a denial of service
    (DoS) condition, or to execute arbitrary code on an affected device.

    The vulnerability is due to improper validation of packet data. An attacker
    could exploit this vulnerability by sending a crafted Smart Install message
    to an affected device on TCP port 4786. A successful exploit could allow
    the attacker to cause a buffer overflow on the affected device, which could
    have the following impacts:
      ? Triggering a reload of the device
      ? Allowing the attacker to execute arbitrary code on the device
      ? Causing an indefinite loop on the affected device that triggers a
        watchdog crash

    Cisco has released software updates that address this vulnerability. There
    are no workarounds that address this vulnerability.

    Smart Install client functionality is enabled by default on switches that
    are running Cisco IOS Software releases that have not been updated to
    address Cisco bug ID CSCvd36820.

    This advisory is available at the following link:
    https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
    cisco-sa-20180328-smi2

    This advisory is part of the March 28, 2018, release of the Cisco IOS and
    IOS XE Software Security Advisory Bundled Publication, which includes 20
    Cisco Security Advisories that describe 22 vulnerabilities. For a complete
    list of the advisories and links to them, see Cisco Event Response: March
    2018 Semiannual Cisco IOS and IOS XE Software Security Advisory Bundled
    Publication.

Affected Products

  o Vulnerable Products

    This vulnerability affects Cisco devices that are running a vulnerable
    release of Cisco IOS or IOS XE Software and have the Smart Install client
    feature enabled.

    Only Smart Install client switches are affected by the vulnerability that
    is described in this advisory. Cisco devices that are configured as a Smart
    Install director are not affected by this vulnerability.

    For a list of devices that support Smart Install, see Smart Install
    Configuration Guide - Supported Devices.

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

    Notes Regarding Specific Releases

    Smart Install client functionality is enabled by default on switches that
    are running Cisco IOS Software releases that have not been updated to
    address Cisco bug ID CSCvd36820.

    Switches that are running releases earlier than Cisco IOS Software Release
    12.2(52)SE are not capable of running Smart Install, but they can be Smart
    Install clients if they support the archive download-sw privileged EXEC
    command.

    Determining Whether the Smart Install Client Feature Is Enabled

    To determine whether a device is configured with the Smart Install client
    feature enabled, use the show vstack config privileged EXEC command on the
    Smart Install client. An output of Role: Client and Oper Mode: Enabled or
    Role: Client (SmartInstall enabled) from the show vstack config command
    confirms that the feature is enabled on the device.

    The following examples show the output of the show vstack config command on
    Cisco Catalyst Switches that are configured as Smart Install clients:

        switch1# show vstack config
         Role: Client (SmartInstall enabled)
         .
         .
         .

        switch2# show vstack config
         Capability: Client
         Oper Mode: Enabled
         Role: Client
         .
         .
         .

    Determining the Cisco IOS Software Release

    To determine which Cisco IOS Software release is running on a device,
    administrators can log in to the device, use the show version command in
    the CLI, and then refer to the system banner that appears. If the device is
    running Cisco IOS Software, the system banner displays text similar to
    Cisco Internetwork Operating System Software or Cisco IOS Software. The
    banner also displays the installed image name in parentheses, followed by
    the Cisco IOS Software release number and release name. Some Cisco devices
    do not support the show version command or may provide different output.

    The following example shows the output of the command for a device that is
    running Cisco IOS Software Release 15.5(2)T1 and has an installed image
    name of C2951-UNIVERSALK9-M:

        Router> show version

        Cisco IOS Software, C2951 Software (C2951-UNIVERSALK9-M), Version 15.5(2)T1, RELEASE SOFTWARE (fc1)
        Technical Support: http://www.cisco.com/techsupport
        Copyright (c) 1986-2015 by Cisco Systems, Inc.
        Compiled Mon 22-Jun-15 09:32 by prod_rel_team
        .
        .
        .

    For information about the naming and numbering conventions for Cisco IOS
    Software releases, see the Cisco IOS and NX-OS Software Reference Guide.

    Determining the Cisco IOS XE Software Release

    To determine which Cisco IOS XE Software release is running on a device,
    administrators can log in to the device, use the show version command in
    the CLI, and then refer to the system banner that appears. If the device is
    running Cisco IOS XE Software, the system banner displays Cisco IOS
    Software, Cisco IOS XE Software, or similar text.

    The following example shows the output of the command for a device that is
    running Cisco IOS XE Software Release 16.2.1 and has an installed image
    name of CAT3K_CAA-UNIVERSALK9-M:

        ios-xe-device# show version

        Cisco IOS Software, Catalyst L3 Switch Software (CAT3K_CAA-UNIVERSALK9-M), Version Denali 16.2.1, RELEASE SOFTWARE (fc1)
        Technical Support: http://www.cisco.com/techsupport
        Copyright (c) 1986-2016 by Cisco Systems, Inc.
        Compiled Sun 27-Mar-16 21:47 by mcpre
        .
        .
        .

    For information about the naming and numbering conventions for Cisco IOS XE
    Software releases, see the Cisco IOS and NX-OS Software Reference Guide.

    Products Confirmed Not Vulnerable

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

    Cisco has confirmed that this vulnerability does not affect Cisco IOS XR
    Software or Cisco NX-OS Software.

Details

  o Cisco Smart Install is a "plug-and-play" configuration and image-management
    feature that provides zero-touch deployment for new (typically access
    layer) switches. The feature allows a customer to ship a Cisco switch to
    any location, install it in the network, and power it on without additional
    configuration requirements. The Smart Install feature incorporates no
    authentication by design.

    A Smart Install network consists of exactly one Smart Install director
    switch or router, also known as an integrated branch director (IBD), and
    one or more Smart Install client switches, also known as integrated branch
    clients (IBCs). A client switch does not need to be directly connected to
    the director; the client switch can be up to seven hops away.

    The director provides a single management point for images and
    configuration of client switches. When a client switch is first installed
    in the network, the director automatically detects the new switch and
    identifies the correct Cisco IOS Software image and the configuration file
    for downloading. The director can also allocate an IP address and hostname
    to a client.

Workarounds

  o There are no workarounds that address this vulnerability for customers who
    require the use of Cisco Smart Install. For customers not requiring Cisco
    Smart Install, the feature can be disabled with the no vstack command. In
    software releases that are associated with Cisco Bug ID CSCvd36820, Cisco
    Smart Install will auto-disable if not in use.

    Administrators are encouraged to consult the informational security
    advisory on Cisco Smart Install Protocol Misuse and the Smart Install
    Configuration Guide.

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.

    Cisco IOS and IOS XE Software

    To help customers determine their exposure to vulnerabilities in Cisco IOS
    and IOS XE Software, Cisco provides a tool, the Cisco IOS Software Checker,
    that identifies any Cisco Security Advisories that impact a specific
    software release and the earliest release that fixes the vulnerabilities
    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 this tool to perform the following tasks:

      ? Initiate a search by choosing one or more releases from a drop-down
        list or uploading a file from a local system for the tool to parse
      ? Enter the output of the show version command for the tool to parse
      ? Create a custom search by including all previously published Cisco
        Security Advisories, a specific advisory, or all advisories in the most
        recent bundled publication

    To determine whether a release is affected by any published Cisco Security
    Advisory, use the Cisco IOS Software Checker on Cisco.com or enter a
    Cisco IOS Software or Cisco IOS XE Software release--for example, 15.1(4)M2
    or 3.13.8S--in the following field:

    [                    ] [Check]

    For a mapping of Cisco IOS XE Software releases to Cisco IOS Software
    releases, refer to the Cisco IOS XE 2 Release Notes, Cisco IOS XE 3S
    Release Notes, or Cisco IOS XE 3SG Release Notes, depending on the
    Cisco IOS XE Software release.

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 George Nosenko from Embedi for reporting this
    vulnerability via GeekPwn.

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.

Subscribe to Cisco Security Notifications

  o Subscribe

Action Links for This Advisory

  o Snort Rule 46096
    Snort Rule 46097
    Cisco IOS and IOS XE Software Smart Install Remote Code Execution
    Cisco IOS and IOS XE Software Smart Install Remote Code Execution

Related to This Advisory

  o Cisco Event Response: March 2018 Semiannual Cisco IOS and IOS XE Software
    Security Advisory Bundled Publication
    Cisco Security Blog: Cisco IOS and IOS XE Software Bundled Publication
    March 2018

URL

  o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
    cisco-sa-20180328-smi2

Revision History

  o 
    +---------+----------------------------+-------------+--------+---------------+
    | Version |        Description         |   Section   | Status |     Date      |
    +---------+----------------------------+-------------+--------+---------------+
    |         | Updated IOS Software       |             |        |               |
    | 1.5     | Checker with products      | --          | Final  | 2018-April-16 |
    |         | found to be                |             |        |               |
    |         | non-vulnerable.            |             |        |               |
    +---------+----------------------------+-------------+--------+---------------+
    |         | Emphasized that Smart      |             |        |               |
    |         | Install is enabled by      | Summary and |        |               |
    | 1.4     | default. Added a link to   | Affected    | Final  | 2018-April-09 |
    |         | the list of devices that   | Products    |        |               |
    |         | support Smart Install.     |             |        |               |
    +---------+----------------------------+-------------+--------+---------------+
    | 1.3     | Added more details to the  | Workarounds | Final  | 2018-April-06 |
    |         | Workarounds section.       |             |        |               |
    +---------+----------------------------+-------------+--------+---------------+
    | 1.2     | Metadata update.           | --          | Final  | 2018-April-02 |
    +---------+----------------------------+-------------+--------+---------------+
    | 1.1     | Added the researcher's     | Source      | Final  | 2018-March-29 |
    |         | company name.              |             |        |               |
    +---------+----------------------------+-------------+--------+---------------+
    | 1.0     | Initial public release.    | --          | Final  | 2018-March-28 |
    +---------+----------------------------+-------------+--------+---------------+

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

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