28 August 2017
Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2017.2142 Cisco Meeting Server Command Injection and Privilege Escalation Vulnerability 28 August 2017 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Cisco Meeting Server Publisher: Cisco Systems Operating System: Virtualisation Cisco Impact/Access: Root Compromise -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2017-6794 Original Bulletin: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170823-cms - --------------------------BEGIN INCLUDED TEXT-------------------- Cisco Security Advisory Cisco Meeting Server Command Injection and Privilege Escalation Vulnerability Medium Advisory ID: cisco-sa-20170823-cms First Published: 2017 August 23 16:00 GMT Version 1.0: Final Workarounds: No workarounds available Cisco Bug IDs: CSCvf53830 CVSS Score: Base 6.7 Base 6.7 CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:X/RL:X/RC:X CVE-2017-6794 CWE-20 Summary A vulnerability in the CLI command-parsing code of Cisco Meeting Server could allow an authenticated, local attacker to perform command injection and escalate their privileges to root. The attacker must first authenticate to the application with valid administrator credentials. The vulnerability is due to insufficient validation of user-supplied input at the CLI for certain commands. An attacker could exploit this vulnerability by authenticating to the affected application and submitting a crafted CLI command for execution at the Cisco Meeting Server CLI. An exploit could allow the attacker to perform command injection and escalate their privilege level to root. 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-20170823-cms Affected Products Vulnerable Products This vulnerability exists in Cisco Meeting Server software versions prior to and including 2.0, 2.1, and 2.2. Administrators can check the system configuration from the CLI of Cisco Meeting Server to determine if a device is affected. An administrator can determine the software version by using the version command. In this example, the following command output shows the version of a device running software version 2.0.6: system> version 2_0_6 Products Confirmed Not Vulnerable No other Cisco products are currently known to be affected by this vulnerability. Details Cisco Meeting Server incorporates video, audio, and content-sharing capabilities into software that can be accessed via a conference room, desktop, or mobile device. Cisco Meeting Server works across Cisco video rooms and connects with Skype for Business and other providers to enable a seamless meeting architecture. This capability exists via collaboration between Cisco and Acano, which was acquired by Cisco in 2016. Workarounds There are no workarounds that address this vulnerability. Fixed Software For information about fixed software releases, consult the Cisco bug ID(s) at the top 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 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. Exploitation and Public Announcements 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 This vulnerability was found during internal security testing. URL https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170823-cms Revision History Version Description Section Status Date 1.0 Initial public release. Final 2017-August-23 LEGAL DISCLAIMER THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME. A standalone copy or paraphrase of the text of this document that omits the distribution URL is an uncontrolled copy and may lack important information or contain factual errors. The information in this document is intended for end users of Cisco products. - --------------------------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 firstname.lastname@example.org 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: http://www.auscert.org.au/render.html?cid=1980 =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: email@example.com 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 iQIVAwUBWaODPox+lLeg9Ub1AQjeuRAAoIX+OgpiNPpIiCJdrwy0U4eMDuEpuIfx i1Web5qpZKLn0BNT9cLkP8QxGqx3W3QZFNzQqz12w5QRWq5wNrkRNOJ2hwVRjutO BI+AudQ6B4smq+ZFyxkfiTX7wLaOCQh6vg7JUXp/8LNc2jCmh7Qf8lIm1x0vlOeU BAUvJ5MzdDkLE6KmESDyUosVWCOYbEVk7MzEunn6l6aVa6cvgkqnWheeEDEqIxqn YXj06CApuYM5TgfcrkxLGWhQPVzQU5cOQMEB8Zp28UEh7IYHs0tjSrIfzvPwBWFT g9QegoTyx/LrCa1LV71RhhO4UR2R0PIx851L5OpngWnp2WFekw+tqiveReqyy5TE S68Cnas/QSXdPc5D/m9Z8n22JC4ocaH0Wj2ZjxdNLTH1bCn/imxdJY9QO7NMPkwO eQrdyKspMlj3vQGHO3ymuiN/PyPhg/tEuB7mpUf+9OMSfhaSR5nQc7zA5n28ODPG qIFYQpQ1DwqFAKoA7uYIxaSUZWlNi0amxMM/VTBhZoggjbK2/POxrkIzn49xIZpm pZ0/SXgZInpcMfwuTuns3ko/zjxJo8jXn108QBIRmHi/B7sNjFVL4qOLA1zwb4q/ qk+0QX5D+5Bri0Y7INXzUNJzojar/kPEr5/3oH19GoSNbM6mkrPs3U7c2i/XM7JA vzs4yncDnVI= =gDSh -----END PGP SIGNATURE-----