Cisco Security Advisory Texas Instruments Bluetooth Low Energy Denial of Service and Remote Code Execution Vulnerability High Advisory ID: cisco-sa-20181101-ap First Published: 2018 November 1 15:00 GMT Version 1.4: Final Workarounds: No workarounds available Cisco Bug IDs: CSCvk44163 CVE-2018-16986 CWE-415 CVSS Score: Base 8.8 Click Icon to Copy Verbose Score

CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:X/RL:X/RC:X CVE-2018-16986 CWE-415 Download CVRF Download PDF Email Summary



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. 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:

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20181101-ap Affected Products Vulnerable Products The following table lists Cisco products that are affected by the vulnerability described in this advisory: Product Cisco Bug ID

Fixed Release Availability

Cisco 1540 Aironet Series Outdoor Access Points CSCvk44163 8.8.100.0 Cisco 1800i Aironet Access Points

CSCvk44163 8.8.100.0

Cisco 1810 Aironet Access Points CSCvk44163 8.8.100.0

Cisco 1815i Aironet Access Points CSCvk44163 8.8.100.0 Cisco 1815m Aironet Access Points CSCvk44163 8.8.100.0 Cisco 1815w Aironet Access Points CSCvk44163 8.8.100.0 Cisco 4800 Aironet Access Points CSCvk44163 8.8.100.0 Meraki MR30H Access Point N/A MR 25.13 and later Meraki MR33 Access Point

N/A MR 25.13 and later Meraki MR74 Access Point N/A

MR 25.13 and later Meraki MR42E Access Point

N/A

MR 26.1 and later Meraki MR53E Access Point N/A

MR 26.1 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 8.7.102.0 or 8.7.106.0. 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 Vulnerable 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



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 vulnerable. 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 controller.



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 The administrator can also issue the WLC controller commandto get the BLE status of the Access Point from the WLC controller. 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: In a browser, log in to the controller’s web interface Click the Monitor tab Click Summary in the left pane 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 8.7.106.0: (wlc)> show sysinfo



Manufacturer's Name.............................. Cisco Systems Inc.

Product Name..................................... Cisco Controller

Product Version.................................. 8.7.106.0

Bootloader Version............................... 1.0.1

Field Recovery Image Version..................... 6.0.182.0

Firmware Version................................. FPGA 1.3, Env 1.6, USB console 1.27

Build Type....................................... DATA + WPS

.

.

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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

Workarounds 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. Source Cisco would like to thank Ben Seri, VP of Research at Armis, for finding and reporting this vulnerability. Cisco Security Vulnerability Policy 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 URL https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20181101-ap Revision History Version Description Section Status Date 1.4 The Meraki product names and firmware versions were updated. Vulnerable Products Final 2019-January-23 1.3 The internal release mapping was updated. N/A Final 2019-January-02 1.2 Added the WLC command "show advanced ble summary" to get the BLE status from the WLC controller. Vulnerable Products Final 2018-December-13 1.1 Added Cisco Aironet 1560 Series Outdoor Access Points as not vulnerable. Products Confirmed Not Vulnerable Final 2018-November-02 1.0 Initial public release. — Final 2018-November-01 Show Less Legal Disclaimer 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 Security Vulnerability Policy 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