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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.1912 Cisco Webex Meetings, Webex Network Recording Player, and Webex Teams DLL Injection Vulnerability 3 June 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Webex Meetings Desktop App Webex Meetings Server Webex Network Recording Player Webex Teams Publisher: Cisco Systems Operating System: Cisco Windows Impact/Access: Execute Arbitrary Code/Commands -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2021-1536 Original Bulletin: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webex-dll-inject-XNmcSGTU - --------------------------BEGIN INCLUDED TEXT-------------------- Cisco Webex Meetings, Webex Network Recording Player, and Webex Teams DLL Injection Vulnerability Priority: Medium Advisory ID: cisco-sa-webex-dll-inject-XNmcSGTU First Published: 2021 June 2 16:00 GMT Version 1.0: Final Workarounds: No workarounds available Cisco Bug IDs: CSCvw48667 CSCvw79311 CSCvw79321 CVE Names: CVE-2021-1536 CWEs: CWE-427 Summary o A vulnerability in Cisco Webex Meetings Desktop App for Windows, Cisco Webex Meetings Server, Cisco Webex Network Recording Player for Windows, and Cisco Webex Teams for Windows could allow an authenticated, local attacker to perform a DLL injection attack on an affected device. To exploit this vulnerability, the attacker must have valid credentials on the Windows system. This vulnerability is due to incorrect handling of directory paths at run time. An attacker could exploit this vulnerability by inserting a configuration file in a specific path in the system, which can cause a malicious DLL file to be loaded when the application starts. A successful exploit could allow the attacker to execute arbitrary code on the affected system with the privileges of another user account. 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-dll-inject-XNmcSGTU Affected Products o Vulnerable Products At the time of publication, this vulnerability affected the following Cisco products: Webex Meetings Desktop App for Windows Webex Meetings Server Webex Network Recording Player for Windows Webex Teams for Windows For information about which Cisco software releases were vulnerable at the time of publication, see the Fixed Software section of this advisory. 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 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 At the time of publication, the release information in the following table (s) was accurate. See the Details section in the bug ID(s) at the top of this advisory for the most complete and current information. Customers are advised to upgrade to an appropriate fixed software release as indicated in the following table(s): Cisco Webex Platform First Fixed Release Webex Meetings Desktop App for Windows 41.1.5.11 41.2.9.23 Webex Meetings Server 3.0 MR4 4.0 MR4 Webex Network Recording Player for Windows 41.1.5.11 41.2.9.23 41.3.0.18986 Webex Teams for Windows 41.4.0.18737 41.5.0.18815 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 Xavier Danest of Decathlon 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-dll-inject-XNmcSGTU Revision History o +----------+---------------------------+----------+--------+--------------+ | Version | Description | Section | Status | Date | +----------+---------------------------+----------+--------+--------------+ | 1.0 | Initial public release. | - | Final | 2021-JUN-02 | +----------+---------------------------+----------+--------+--------------+ - --------------------------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. 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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 iQIVAwUBYLgtnuNLKJtyKPYoAQgOXhAAlzvjApXIs06TJJURdc+VoLiP2Wx6U119 /LvlEkvjw8uZsAUzBchQvqbPnSCG7HlKYMGntjlUuFlN5A7J5AJzOjyyTAB2SYPh +TV+WPyLVTt3dm5Yz/yEFEjrIIHCFBsc0c6Okzbq2qKD0Vtk1RCPBcDl8wjkcLFp cg/8RoIzaqSBU3x9ho8SWfj+MYhbWxbKB4HFdRNPWhryNUuiPIeTbYyE/RRisB2S RXK10Gy9dmElCrswQafzFJa0G8vN7j/W05wE4ZB9V7h79VE2RHDSheYFNsH5OIpX 8JtsTc05QCS0pxGM7zJfSsK0Xe1djzy/utyXrmmbf74FZnUiCKeVq7+ANEgxSNJp kbEpyYJ1UoDuEtwrvsXadKznvbw7G5BQY60V3zcQV2KRbsRTfg9BOVa2NGRnOnA1 /q/R+eTOX2PVkvsikeUQxicLQj21HHTbQ3Obbo617qeOiJMuc3rLM34l/bs8NnTj 6bapqFIsz+VdreXjswEA9/0QvBsqga182VlHOrMpJCCQH6dgkDWZ0KjmH3jxYUVw qfHsc/Vt64U6GE0jSjWNtpOopuDp5vRz0fmeK9MFIMIZT4I6FOS08b2Vfdo//hZP Wi25/k4TMXsGnqYlbVNvi0at5PaGRm3V+T9wq2LLSlFicgK6RmZuX/dxntrbyc9y zJyqFiD7HbM= =fyJa -----END PGP SIGNATURE-----