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             AUSCERT External Security Bulletin Redistribution

                Key Negotiation of Bluetooth Vulnerability
                              14 August 2019


        AusCERT Security Bulletin Summary

Product:           Cisco products
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Unauthorised Access -- Console/Physical
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-9506  

Reference:         ASB-2019.0238

Original Bulletin: 

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

Key Negotiation of Bluetooth Vulnerability

Priority:        Medium

Advisory ID:     cisco-sa-20190813-bluetooth

First Published: 2019 August 13 17:00 GMT

Version 1.0:     Interim

Workarounds:     No workarounds available


CVSS Score:


  o A weakness in the Bluetooth Basic Rate/Enhanced Data Rate (BR/EDR) protocol
    core specification exposes a vulnerability that could allow for an
    unauthenticated, adjacent attacker to perform a man-in-the-middle attack on
    an encrypted Bluetooth connection. The attack must be performed during
    negotiation or renegotiation of a paired device connection; existing
    sessions cannot be attacked.

    The issue could allow the attacker to reduce the entropy of the negotiated
    session key that is used to secure a Bluetooth connection between a paired
    device and a host device. An attacker who can successfully inject a
    malicious message into a Bluetooth connection during session negotiation or
    renegotiation could cause the strength of the session key to be susceptible
    to brute force attack.

    This advisory will be updated as additional information becomes available.
    There are no workarounds that address this vulnerability.

    This advisory is available at the following link:

Affected Products

  o The Vulnerable Products section includes Cisco bug IDs for each affected
    product. The bugs are accessible through the Cisco Bug Search Tool and
    contain additional platform-specific information, including workarounds (if
    available) and fixed software releases.
    Vulnerable Products

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

    Product                                 Cisco Bug ID
                  Cisco Collaboration Desk Endpoints
    Cisco Webex DX70                        CSCvq80515
    Cisco Webex DX80                        CSCvq80515
                            Cisco IP Phones
    Cisco 8821 Wireless IP Phones           CSCvq80441
    Cisco 8845 IP Phones                    CSCvq80432 / CSCvq80432
    Cisco 8851 IP Phones                    CSCvq80439 / CSCvq80431
    Cisco 8861 IP Phones                    CSCvq80439 / CSCvq80431
    Cisco 8865 IP Phones                    CSCvq80432 / CSCvq80432
    Cisco SPA525G2 Small Business IP Phones CSCvq80426

    Products Confirmed Not Vulnerable

    Only products listed in the Vulnerable Products section of this advisory
    are known to be affected by this vulnerability.


  o There are no workarounds that address this vulnerability.

Fixed Software

  o For information about fixed software releases, consult the Cisco bug ID(s)
    that are at the top of this advisory and listed 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
    Technical Assistance Center (TAC) or their contracted maintenance

Exploitation and Public Announcements

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


  o Cisco would like to thank Daniele Antonioli, SUTD, Singapore; Dr. Nils Ole
    Tippenhauer, CISPA, Germany; and Prof. Kasper Rasmussen, University of
    Oxford, England, for reporting this issue.

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.


  o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190813-bluetooth

Revision History

  o +---------+--------------------------+---------+---------+----------------+
    | Version |       Description        | Section | Status  |      Date      |
    | 1.0     | Initial public release.  | -       | Interim | 2019-August-13 |

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