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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2020.0079 Cisco Webex Centers Denial of Service Vulnerability 9 January 2020 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Cisco Webex Centers Publisher: Cisco Systems Operating System: Cisco Impact/Access: Denial of Service -- Remote with User Interaction Resolution: Patch/Upgrade CVE Names: CVE-2020-3116 Original Bulletin: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200108-webex-centers-dos - --------------------------BEGIN INCLUDED TEXT-------------------- Cisco Webex Centers Denial of Service Vulnerability Priority: Medium Advisory ID: cisco-sa-20200108-webex-centers-dos First Published: 2020 January 8 16:00 GMT Version 1.0: Final Workarounds: No workarounds available Cisco Bug IDs: CSCvr16379CSCvr16383CSCvr16386 CVE-2020-3116 CWE-20 CVSS Score: 5.5 AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H/E:X/RL:X/RC:X Summary o A vulnerability in the way Cisco Webex applications process Universal Communications Format (UCF) files could allow an attacker to cause a denial of service (DoS) condition. The vulnerability is due to insufficient validation of UCF media files. An attacker could exploit this vulnerability by sending a user a malicious UCF file through a link or email attachment and persuading the user to open the file with the affected software on the local system. A successful exploit would cause the application to quit unexpectedly. 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-20200108-webex-centers-dos Affected Products o Vulnerable Products At the time of publication, this vulnerability affected Cisco Webex Event Center, Cisco Webex Meeting Center, Cisco Webex Support Center, and Cisco Webex Training Center, which are cloud based. See the Details section in the bug ID(s) at the top of this advisory for the most complete and current information. 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 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 providers. Fixed Releases Cisco has addressed this vulnerability in Cisco Webex Event Center, Cisco Webex Meeting Center, Cisco Webex Support Center, and Cisco Webex Training Center, which are cloud based. No user action is required. Customers can determine the current remediation status or software version by using the Help function in the service GUI. See the Details section in the bug ID(s) at the top of this advisory for the most complete and current information. 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 Wen Guang Jiao of Qihoo 360 Core Security 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-20200108-webex-centers-dos Revision History o +---------+--------------------------+---------+--------+-----------------+ | Version | Description | Section | Status | Date | +---------+--------------------------+---------+--------+-----------------+ | 1.0 | Initial public release. | - | Final | 2020-January-08 | +---------+--------------------------+---------+--------+-----------------+ - --------------------------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 iQIVAwUBXhajhWaOgq3Tt24GAQiD1w/9FWBhpzEdC9I1SCniBZ/rq1SUaxl8os6a p/ZI3VwtoLIgp+M+bvjQP2MYMJ8UAZaXRDdVqAOa/cOyVLE2eqyw0Lrh08B8bhWI MM+ToJyJD6NOIwVFfbSPfl6NOie/BFFaJsrlnqeNDT4cagZSbScXFKpgZiUiigzz 2c8nk8GhfsHm4oMMAj0cQvLgGeZkv49GYIJ17+lWIttiaFihX3/nhDZ1weexJF1J /yoZLW2WjFjEaT1s6uA1y+aeC+DuGpMl6n32B3Bw+aNU1hI1lQKVf+kcctCuAru1 0iR49LXrvQX7D0QRZm/wmQai/FGYpBDjx33D4gscig/qiETYHI/rUatF7ljmIuNy +uOFsgVtn0aMJMXo0tmiOcLcKtaGEuWabfjdvBHIZGg1GkEK5HCf0h4IJ/+iOt3z e0MOklu3QsqzIrKcfNEQBOLKHW9trMWXjWj+xV39cfx0Vb1zRN522xp85X1ubDLf TIim5Qoq770SPxC24fSiNh+qOZ04E31XHZLP29SyOe8AA9+WJRpxJTN4FwRkH0Pc 3EAXikXzIop5C/6MNbD5o0Q4Y9CSUjOBQP+1fqAPGyEtcGiJcc5Lg3HP3uI+yjo5 /qr6tZrEkOC24KYJgYX3ILu/vmrfExQ1ymWDfUxrR7s3O97btqcI0BqS+TfQBOKp ZUOcuOeTnmw= =OGpZ -----END PGP SIGNATURE-----