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AUSCERT External Security Bulletin Redistribution
ESB-2018.3432.3
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:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20181101-ap
Revision History: December 14 2018: Vendor added a WLC command.
November 5 2018: Added more products confirmed not vulnerable.
November 2 2018: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
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
CVE-2018-16986
CVSS Score:
Base 8.8
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
Summary
* 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 Fixed Release
ID Availability
Cisco 1540 Aironet Series Outdoor Access CSCvk44163 8.8.100.0
Points
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 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 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
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 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
.
.
.
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.
URL
* https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-20181101-ap
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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