Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.2333 Broadcom MediaxChange Vulnerability Affecting Cisco Products: July 2021 8 July 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Cisco IP Phone Products Publisher: Cisco Systems Operating System: Cisco Impact/Access: Execute Arbitrary Code/Commands -- Console/Physical Increased Privileges -- Console/Physical Resolution: Patch/Upgrade CVE Names: CVE-2021-33478 Original Bulletin: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-brcm-mxc-jul2021-26LqUZUh Comment: To exploit this vulnerability on the affected Cisco products, the attacker would need to dismount the backplate of the device and trigger a specific series of impulses on the chipset. - --------------------------BEGIN INCLUDED TEXT-------------------- Broadcom MediaxChange Vulnerability Affecting Cisco Products: July 2021 Priority: Medium Advisory ID: cisco-sa-brcm-mxc-jul2021-26LqUZUh First Published: 2021 July 7 16:00 GMT Version 1.0: Final Workarounds: No workarounds available Cisco Bug IDs: CSCvx08743 CSCvx08744 CSCvx08753 CSCvx08762 CSCvx08807 CVE Names: CVE-2021-33478 CWEs: CWE-120 Summary o A vulnerability in the TrustZone implementation in certain Broadcom MediaxChange firmware was reported by security researchers. To exploit this vulnerability on the affected Cisco products, the attacker would need to dismount the backplate of the device and trigger a specific series of impulses on the chipset. This would reload the device in a special mode allowing access to the bootshell. The attacker would then issue specific commands with crafted parameters in the bootshell, which would trigger the vulnerability. Exploitation of this vulnerability could result in arbitrary code execution with privilege escalation. At the time of publication, a link to the details about this vulnerability was not available. This advisory is available at the following link: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-brcm-mxc-jul2021-26LqUZUh Affected Products o Cisco investigated its product line to determine which products may be affected by this vulnerability. The Vulnerable Products section of this advisory 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. Any product or service not listed in the Vulnerable Products section of this advisory is to be considered not vulnerable. Vulnerable Products The following table lists Cisco products that are affected by the vulnerability that is described in this advisory. If a future release date is indicated for software, the date provided represents an estimate based on all information known to Cisco as of the Last Updated date at the top of the advisory. Availability dates are subject to change based on a number of factors, including satisfactory testing results and delivery of other priority features and fixes. If no version or date is listed for an affected component (indicated by a blank field and/or an advisory designation of Interim), Cisco is continuing to evaluate the fix and will update the advisory as additional information becomes available. After the advisory is marked Final, customers should refer to the associated Cisco bug(s) for further details. Unless otherwise documented, all software releases earlier than the first fixed release are to be considered affected by this vulnerability. Product Cisco Bug Fixed Release ID Availability Cisco IP Phone 8800 Series with Multiplatform Firmware Cisco IP Phone 8811 with Multiplatform Firmware Cisco IP Phone 8841 with Multiplatform CSCvx08743 11.3(4) (available) Firmware Cisco IP Phone 8851 with Multiplatform Firmware Cisco IP Phone 8861 with Multiplatform Firmware Cisco IP Phone 8845 with Multiplatform Firmware CSCvx08744 11.3(4) (available) Cisco IP Phone 8865 with Multiplatform Firmware Cisco IP Phone 8845 CSCvx08753 14.0(1) (available) Cisco IP Phone 8865 Cisco IP Phone 8800 Series Cisco IP Phone 8811 Cisco IP Phone 8841 CSCvx08762 14.0(1) (available) Cisco IP Phone 8851 Cisco IP Phone 8861 Cisco Wireless IP Phone 8821 CSCvx08807 11.0(6)SR1 (available) Products Confirmed Not Vulnerable Only products listed in the Vulnerable Products section of this advisory are known to be affected by this vulnerability. Workarounds o There are no workarounds that address this vulnerability. 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 providers. Exploitation and Public Announcements o The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory. Source o Cisco would like to thank Yuanzhe Wu, James E. Posen, and Ang Cui of Red Balloon Security, Inc. for reporting this vulnerability. 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. URL o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-brcm-mxc-jul2021-26LqUZUh Revision History o +----------+---------------------------+----------+--------+--------------+ | Version | Description | Section | Status | Date | +----------+---------------------------+----------+--------+--------------+ | 1.0 | Initial public release. | - | Final | 2021-JUL-07 | +----------+---------------------------+----------+--------+--------------+ - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: https://www.auscert.org.au/bulletins/ =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBYOZW+ONLKJtyKPYoAQgOLhAAg39QLKnoGeKgGdi4wlKgnPPhUXPWmZX7 Ck5JiVVbWJprrm7TZFt/rmu2A3sKF966R/0tf+IvxY6CHPNrDzflG9Bxosd2+j46 fT/jZ+V78qwBfexmnDJWhJ5O7UXJj+tR3HKm+DEWAbTOSdRB6f9rdqMgeph631qk OHx9zdRTZ33BLQFPlVI34yW6WppHKYtTmPA8hgKWd2uZd5aykB2p4waRZU98DHoP n087oH7C7FwVPNXhHgQlhqkSBh9s5b+Uc7cqcZ+2jddin9uLs0ZDD2IJ720s/9zk E/Ih2YENd6gXPCogJmFQqsjJ7Zr5urnHhF+X06EsIaBkkAExS31zlCLpLgWcRTHf AAz0APbG3+2Mk3EaIn7oNROfBMitcIfDw618iEBO8LqU4Q57wvY+o0wW7cNmc9Q/ 7TPcYpxp5jbgIlyWzVyeSdEzw9sflm2bSPH6yJVwv1M3y+bj/6DTU8s5aHAAQ8zt V1wQbXzqvtxMohAXgmgYrYflv6tbhbvU+7VPOSyV8GyPfLUZJkzJa1lefCJo8Bg4 ocEaYnL7lbxg6syp4VI8FYyfcFKSIQelXm7/aDcRHxifb1sJbeJWDZGhzYVQK3yp P6U8SOvIC7psWZXQaH54ZROOylBxvDOhXqygBFLQ2aTsn4Acfl7MBRD1thOxUbAl 1nlbkVpsEBs= =JidY -----END PGP SIGNATURE-----