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             AUSCERT External Security Bulletin Redistribution

BlackBerry QNX-2021-001 Vulnerability Affecting Cisco Products: August 2021
                              31 August 2021


        AusCERT Security Bulletin Summary

Product:           Cisco Products
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
                   Denial of Service               -- Remote/Unauthenticated
Resolution:        None
CVE Names:         CVE-2021-22156  

Reference:         ESB-2021.1489.2

Original Bulletin: 

Comment: On August 17, 2021, BlackBerry released a security advisory, QNX-2021-001,
         that disclosed an integer overflow vulnerability. Cisco has completed its
         investigation into its product line to determine which products may be
         affected by this vulnerability. No products are known to be affected.
         This advisory is being sent for awareness only.

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BlackBerry QNX-2021-001 Vulnerability Affecting Cisco Products: August 2021

Priority:        Critical
Advisory ID:     cisco-sa-qnx-TOxjVPdL
First Published: 2021 August 18 16:00 GMT
Last Updated:    2021 August 25 14:44 GMT
Version 1.4:     Final
Workarounds:     No workarounds available
CVE Names:       CVE-2021-22156
CWEs:            CWE-190


  o On August 17, 2021, BlackBerry released a security advisory, QNX-2021-001 ,
    that disclosed an integer overflow vulnerability in the following
    BlackBerry software releases:

       QNX Software Development Platform (SDP) - 6.5.0SP1 and earlier
       QNX OS for Medical - 1.1 and earlier
       QNX OS for Safety - 1.0.1 and earlier

    A successful exploit could allow an attacker to execute arbitrary code or
    cause a denial of service (DoS).

    For a description of this vulnerability, see QNX-2021-001 .

    This advisory is available at the following link:

Affected Products

  o Vulnerable Products

    Cisco has completed its investigation into its product line to determine
    which products may be affected by this vulnerability. No products are known
    to be affected. The bugs are accessible through the Cisco Bug Search Tool 
    and contain additional platform-specific information, including workarounds
    (if available) and fixed software releases.

    Products Confirmed Not Vulnerable

    The following Cisco products leverage the affected QNX software; however,
    Cisco has confirmed that the vulnerability is not exploitable on these

    Routing and Switching - Enterprise and Service Provider

       Channelized shared port adapters (SPAs) ( CSCvz34866 )
       Circuit Emulation over Packet (CEoP) SPAs ( CSCvz34865 )
       IOS XR 32-bit Software ( CSCvz34871 )
        Note: IOS XR 64-bit Software does not leverage QNX software.
       RF Gateway 10 ( CSCvz34869 )

    No other Cisco products are known to be affected by this vulnerability.


  o Any workarounds are documented in the product-specific Cisco bugs, which
    are identified in the Vulnerable Products section of this advisory.

Fixed Software

  o 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 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 public announcements or malicious use of this vulnerability against
    Cisco products or services.


  o This vulnerability was publicly disclosed by BlackBerry on August 17, 2021.

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-qnx-TOxjVPdL

Revision History

  o +---------+-------------------------+-------------+---------+-------------+
    | Version |       Description       |   Section   | Status  |    Date     |
    |         | Updated summary and     | Summary,    |         |             |
    | 1.4     | affected products.      | Affected    | Final   | 2021-AUG-25 |
    |         |                         | Products    |         |             |
    |         | Updated products under  |             |         |             |
    | 1.3     | investigation and       | Affected    | Interim | 2021-AUG-24 |
    |         | products confirmed not  | Products    |         |             |
    |         | vulnerable.             |             |         |             |
    | 1.2     | Added products under    | Affected    | Interim | 2021-AUG-23 |
    |         | investigation.          | Products    |         |             |
    | 1.1     | Corrected broken link.  | Workarounds | Interim | 2021-AUG-20 |
    | 1.0     | Initial public release. | -           | Interim | 2021-AUG-18 |

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