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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
CVE Names: CVE-2019-9506
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Key Negotiation of Bluetooth Vulnerability
Advisory ID: cisco-sa-20190813-bluetooth
First Published: 2019 August 13 17:00 GMT
Version 1.0: Interim
Workarounds: No workarounds available
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:
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.
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.
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.
| Version | Description | Section | Status | Date |
| 1.0 | Initial public release. | - | Interim | 2019-August-13 |
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