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14 December 2018

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             AUSCERT External Security Bulletin Redistribution

       Texas Instruments Bluetooth Low Energy Denial of Service and
                    Remote Code Execution Vulnerability
                             14 December 2018


        AusCERT Security Bulletin Summary

Product:           Cisco Aironet Access Points
                   Meraki Access Points
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-2018-16986  

Original Bulletin: 

Revision History:  December 14 2018: Vendor added a WLC command.
                   November  5 2018: Added more products confirmed not vulnerable.
                   November  2 2018: Initial Release

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Texas Instruments Bluetooth Low Energy Denial of Service and Remote Code
Execution Vulnerability

Priority:        High
Advisory ID:     cisco-sa-20181101-ap
First Published: 2018 November 1 15:00 GMT
Last Updated:    2018 December 13 20:58 GMT
Version 1.2:     Final
Workarounds:     No workarounds available
Cisco Bug IDs:   CSCvk44163
CVSS Score:
Base 8.8


  * On November 1st, 2018, Armis announced the presence of a Remote Code
    Execution (RCE) or Denial of Service (DoS) vulnerability in the Bluetooth
    Low Energy (BLE) Stack on Texas Instruments (TI) chips CC2640 and CC2650.
    This vulnerability has been assigned the Common Vulnerabilities and
    Exposures (CVE) ID of CVE-2018-16986.

    The vulnerability is due to a memory corruption condition that may occur
    when processing malformed BLE frames. An attacker in close proximity to an
    affected device that is actively scanning could exploit the issue by
    broadcasting malformed BLE frames. A successful exploit may result in the
    attacker gaining the ability to execute arbitrary code or cause a denial of
    service condition on an affected device.

    There are no workarounds that address this vulnerability.

    This advisory is available at the following link:

Affected Products

  * Vulnerable Products

    The following table lists Cisco products that are affected by the
    vulnerability described in this advisory:

    Product                                     Cisco Bug   Fixed Release
                                                ID          Availability
    Cisco 1540 Aironet Series Outdoor Access    CSCvk44163
    Cisco 1800i Aironet Access Points           CSCvk44163
    Cisco 1810 Aironet Access Points            CSCvk44163
    Cisco 1815i Aironet Access Points           CSCvk44163
    Cisco 1815m Aironet Access Points           CSCvk44163
    Cisco 1815w Aironet Access Points           CSCvk44163
    Cisco 4800 Aironet Access Points            CSCvk44163
    Meraki MR30H AP                             N/A         MR 25.13 and later
    Meraki MR33 AP                              N/A         MR 25.13 and later
    Meraki MR42E AP                             N/A         MR 25.13 and later 
    Meraki MR53E AP                             N/A         MR 25.13 and later
    Meraki MR74                                 N/A         MR 25.13 and later

    Determining if the Cisco Aironet Access Point Supports BLE

    Cisco Aironet Access Points first supported the BLE feature in software
    release 8.7, which means an Access Point is only vulnerable if running
    software release or To determine if a device supports
    BLE, the administrator can issue the show controllers bleRadio 0 interface 
    command. If the command is not recognized or the error message BLE not
    supported on this platform is displayed, the Access Point does not support
    BLE and is considered not vulnerable.

        ap# show controllers bleRadio 0 interface
        % Unrecognized command

        ap# show controllers bleRadio 0 interface
        BLE not supported on this platform

    Determining if the Cisco Aironet Access Point with BLE Support is

    If a Cisco Aironet Access Point does support BLE, it is only vulnerable if
    BLE is active and BLE scan mode is enabled (BLE scan mode is disabled by
    default). The administrator can issue the show controllers bleRadio 0
    interface command and if the Device Status is Unknown the Access Point is
    not vulnerable.

        ap# show controllers bleRadio 0 interface

        Active BLE host interface       : /dev/ttyMSM1
        Device Status                   : Unknown
        Device resets                   : 0
        Heart beat status               : Off

    The Cisco Aironet Access Points have BLE scan mode disabled by default. The
    administrator can issue show controllers bleRadio 0 timers and if the Scan
    timer status is Not Running, the Access Point is not vulnerable.

        ap# show controllers bleRadio 0 timers

        Scan timer status       : Not Running

    In addition, if the administrator issues the show controllers bleRadio 0
    scan brief and there are no entries displayed, the Access Point is not

        ap# show controllers bleRadio 0 scan brief
        Profile MAC  RSSI(-dBm)  RSSI@1meter(-dBm)  Last-heard

    Determining the BLE Status from the WLC Controller

    The administrator can also issue the WLC controller command show advanced
    ble summary to get the BLE status of the Access Point from the WLC

    wlc# show advanced ble summary
    Global BLE Mgmt Admin State: DOWN

    BLE summary for all APs

    AP Name                       Interface        Admin State  Operation State
    --------------------------    ---------        -----------  ---------------
    ap1800i-r2sw1-te-1-0-11       Integrated       DOWN         Non Operational
    ap3800i_r2-sw1-Te1-0-5        USB dongle       DOWN         Non Operational

    Determining the Cisco Wireless LAN Controller Software Release

    To determine which Cisco Wireless LAN Controller (WLC) Software release is
    running on a device, administrators can use the controller's web interface
    or the CLI.

    To use the web interface, do the following:

     1. In a browser, log in to the controller's web interface
     2. Click the Monitor tab
     3. Click Summary in the left pane
     4. Under Controller Summary, the Software Version field shows the release
        number of the software that is currently running on the device

    To use the CLI, log in to the controller via Telnet, issue the show sysinfo
    command, and then refer to the value in the Product Version field of the
    command output. The following example shows the command output for a device
    that is running Cisco WLC Software Release

        (wlc)> show sysinfo

        Manufacturer's Name.............................. Cisco Systems Inc.
        Product Name..................................... Cisco Controller
        Product Version..................................
        Bootloader Version............................... 1.0.1
        Field Recovery Image Version.....................
        Firmware Version................................. FPGA 1.3, Env 1.6, USB console 1.27
        Build Type....................................... DATA + WPS

    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:

      + Aironet 1800s Active Sensor
      + Aironet 1815t Series Access Points
      + Aironet 1830 Series Access Points
      + Aironet 1850 Series Access Points
      + Aironet 1560 Series Outdoor Access Points
      + Aironet 2800 Series Access Points
      + Aironet 3800 Series Access Points
      + Aironet Access Points - Running Cisco IOS Software


  * There are no workarounds that address this vulnerability.

Fixed Software

  * For information about fixed software releases, consult the Cisco bugs
    identified in the Vulnerable Products section of this advisory.

    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
    TAC or their contracted maintenance providers.

Exploitation and Public Announcements

  * The Cisco Product Security Incident Response Team (PSIRT) is not aware of
    any malicious use of the vulnerability that is described in this advisory.


  * Cisco would like to thank Ben Seri, VP of Research at Armis, for finding
    and reporting this vulnerability.


  * https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/

Revision History

    | Version |       Description        |  Section   | Status |       Date       |
    |         | Added the WLC command    |            |        |                  |
    |         | "show advanced ble       | Vulnerable |        |                  |
    | 1.2     | summary" to get the BLE  | Products   | Final  | 2018-December-13 |
    |         | status from the WLC      |            |        |                  |
    |         | controller.              |            |        |                  |
    |         | Added Cisco Aironet 1560 | Products   |        |                  |
    | 1.1     | Series Outdoor Access    | Confirmed  | Final  | 2018-November-02 |
    |         | Points as not            | Not        |        |                  |
    |         | vulnerable.              | Vulnerable |        |                  |
    | 1.0     | Initial public release.  | -          | Final  | 2018-November-01 |

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