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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.0136 Cisco Webex Meetings and Cisco Webex Meetings Server Host Key Brute Forcing Vulnerability 14 January 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Cisco Webex Meetings Cisco Webex Meetings Server Publisher: Cisco Systems Operating System: Cisco Impact/Access: Reduced Security -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2021-1311 Original Bulletin: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webex-brutef-hostkey-FWRMxVF - --------------------------BEGIN INCLUDED TEXT-------------------- Cisco Webex Meetings and Cisco Webex Meetings Server Host Key Brute Forcing Vulnerability Priority: Medium Advisory ID: cisco-sa-webex-brutef-hostkey-FWRMxVF First Published: 2021 January 13 16:00 GMT Version 1.0: Final Workarounds: No workarounds available Cisco Bug IDs: CSCvv72420 CSCvv84319 CVE Names: CVE-2021-1311 CWEs: CWE-307 Summary o A vulnerability in the reclaim host role feature of Cisco Webex Meetings and Cisco Webex Meetings Server could allow an authenticated, remote attacker to take over the host role during a meeting. This vulnerability is due to a lack of protection against brute forcing of the host key. An attacker could exploit this vulnerability by sending crafted requests to a vulnerable Cisco Webex Meetings or Webex Meetings Server site. A successful exploit would require the attacker to have access to join a Webex meeting, including applicable meeting join links and passwords. A successful exploit could allow the attacker to acquire or take over the host role for a meeting. Cisco has released software updates that address this vulnerability. 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-webex-brutef-hostkey-FWRMxVF Affected Products o Vulnerable Products This vulnerability affected all Cisco Webex Meetings sites prior to December 15, 2020. Webex Meetings is cloud based. At the time of publication, this vulnerability also affected the following releases of Cisco Webex Meetings Server, which is on premises. See the Details section in the bug ID(s) at the top of this advisory for the most complete and current information. 3.0MR3 Security Patch 5 and earlier 4.0MR3 Security Patch 4 and earlier 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 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. Fixed Releases Cisco has addressed this vulnerability in Cisco Webex Meetings sites, which are cloud based. No user action is required. At the time of publication, the following releases for Cisco Webex Meetings Server, which is on-premises software, contained the fix for this vulnerability. Customers are advised to apply updated software releases. See the Details section in the bug ID(s) at the top of this advisory for the most complete and current information. 3.0MR3 Security Patch 6 4.0MR3 Security Patch 5 Customers who need additional information are advised to contact the Cisco 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 Nabeel Ahmed and Tom Wyckhuys of NTT Belgium 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-webex-brutef-hostkey-FWRMxVF Revision History o +----------+---------------------------+----------+--------+--------------+ | Version | Description | Section | Status | Date | +----------+---------------------------+----------+--------+--------------+ | 1.0 | Initial public release. | - | Final | 2021-JAN-13 | +----------+---------------------------+----------+--------+--------------+ - --------------------------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). 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