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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2017.2648 Cisco Expressway Series and Cisco TelePresence Video Communication Server REST API Denial of Service Vulnerability 19 October 2017 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Cisco TelePresence Video Communication Server (VCS) Software Cisco Expressway Series Software Publisher: Cisco Systems Operating System: Cisco Impact/Access: Denial of Service -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2017-12287 Original Bulletin: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20171018-expressway-tp-vcs - --------------------------BEGIN INCLUDED TEXT-------------------- Cisco Security Advisory Cisco Expressway Series and Cisco TelePresence Video Communication Server REST API Denial of Service Vulnerability Medium Advisory ID: cisco-sa-20171018-expressway-tp-vcs First Published: 2017 October 18 16:00 GMT Version 1.0: Final Workarounds: No workarounds available Cisco Bug IDs: CSCve77571 CVSS Score: Base 4.3 Base 4.3 CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:X/RL:X/RC:X CVE-2017-12287 CWE-399 Summary A vulnerability in the cluster database (CDB) management component of Cisco Expressway Series Software and Cisco TelePresence Video Communication Server (VCS) Software could allow an authenticated, remote attacker to cause the CDB process on an affected system to restart unexpectedly, resulting in a temporary denial of service (DoS) condition. The vulnerability is due to incomplete input validation of URL requests by the REST API of the affected software. An attacker could exploit this vulnerability by sending a crafted URL to the REST API of the affected software on an affected system. A successful exploit could allow the attacker to cause the CDB process on the affected system to restart unexpectedly, resulting in a temporary DoS condition. 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-20171018-expressway-tp-vcs Affected Products Vulnerable Products This vulnerability affects Cisco Expressway Series Software and Cisco TelePresence Video Communication Server (VCS) Software. For information about affected software releases, consult the Cisco bug ID(s) at the top of this advisory. Products Confirmed Not Vulnerable No other Cisco products are currently known to be affected by this vulnerability. Indicators of Compromise Exploitation of this vulnerability will cause the CDB process to restart. When the process restarts, the following system alarm will be generated: An unexpected software error was detected in ClusterDB: unknown reason Contact the Cisco Technical Assistance Center (TAC) to determine whether the system has been compromised by exploitation of this vulnerability. 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-20171018-expressway-tp-vcs Revision History Version Description Section Status Date 1.0 Initial public release. Final 2017-October-18 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 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 iQIVAwUBWegqC4x+lLeg9Ub1AQhi6w/+PH325Aesmq69zfuNCTaE4D2kt0kb7XEc 7T0s7ahI9m2bE3aR36WjYKe+6S4gRvcgW6uhPRkvn5VR0KEtroq3wl13oT5Z7kZF ShEKiQCqBS77vCgcOmJGyo+wM0naDHcG/QMPDcgJyEuaD3BJBRC0trB14TFuMdQW cCoCLijp/6kIbkrg4WL2fr4wESFPxrJV4hsl35znOFIL9gIM/bDkBWAKmDeJ3aix pQ3oKYnaTp1xqUSOyYFeVHJK4Aokr5XRW22kuQT5ft/+a3TMQjhow/t6ZG93C+3n LTzPlFqSFyYjOw0VdCRa+fupJyALNH5wtKNrN96WrhfHUcuCqxuy2VKLhu3xbw2y b4XwIOvwNxcv2BUfTCi94ibdvy7pRBg+nYWlktBRSGCtA6WLKc0qsEl1phXOz9Ej 492O76vzuqrbGZpogYdP1wDIV+Y5pF5zaBMOX8ViP0oZapffneVsmD+0QOWzSmNP Ti8UzopXgBzJrQ7TmEwLs0hUDfCzlXEsIyP0Rpqy+H18x5uL+dLWjveotQVr8YaZ 2/NP2VhvLxV3+AYwIlaUbKr6jzWkXKLboiQrHQVRlUzPxrJOnBUVLVp6NDdrDMj+ zUGSAZJGtU32KO6aNboGTVvi0n1yAT1pHBmS3GGSWS+Rd5QCx0NzSXQJZwLlHPUb FHNYSG/OoxA= =1hPX -----END PGP SIGNATURE-----