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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2019.0533.2 Cisco IP Phone 7800 and 8800 Series Cisco Discovery Protocol and Link Layer Discovery Protocol Denial of Service Vulnerability 11 March 2019 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Cisco Wireless IP Phone 8821 Cisco IP Phone 8800 Series Cisco Unified IP Conference Phone 8831 Cisco IP Phone 8865 Cisco IP Phone 8861 Cisco IP Phone 8800 Series Cisco IP Phone 7841 Cisco IP Phone 7861 Cisco IP Conference Phone 8832 Cisco IP Phone 7811 Cisco IP Phone 7821 Publisher: Cisco Systems Operating System: Cisco Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2019-1684 Original Bulletin: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190220-cdp-lldp-dos Revision History: March 11 2019: Updated to version 1.1 from vendor February 21 2019: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- Cisco IP Phone 7800 and 8800 Series Cisco Discovery Protocol and Link Layer Discovery Protocol Denial of Service Vulnerability Priority: Medium Advisory ID: cisco-sa-20190220-cdp-lldp-dos First Published: 2019 February 20 16:00 GMT Last Updated: 2019 March 9 00:28 GMT Version 1.1: Final Workarounds: No workarounds available Cisco Bug IDs: CSCvn47250CSCvo54699CSCvo55040 CVE-2019-1684 CWE-399 CVSS Score: 6.5 AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:X/RL:X/RC:X Summary o A vulnerability in the Cisco Discovery Protocol or Link Layer Discovery Protocol (LLDP) implementation for the Cisco IP Phone 7800 and 8800 Series could allow an unauthenticated, adjacent attacker to cause an affected phone to reload unexpectedly, resulting in a temporary denial of service (DoS) condition. The vulnerability is due to missing length validation of certain Cisco Discovery Protocol or LLDP packet header fields. An attacker could exploit this vulnerability by sending a malicious Cisco Discovery Protocol or LLDP packet to the targeted phone. A successful exploit could allow the attacker to cause the affected phone to reload 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-20190220-cdp-lldp-dos Affected Products o Vulnerable Products The following Cisco phone models are vulnerable: IP Conference Phone 7832 IP Conference Phone 8832 IP Phone 7800 Series with Multiplatform Firmware IP Phone 7811 IP Phone 7821 IP Phone 7841 IP Phone 7861 IP Phone 8800 Series IP Phone 8800 Series - VPN feature IP Phone 8811 IP Phone 8841 IP Phone 8845 IP Phone 8845 with Multiplatform Firmware IP Phone 8851 IP Phone 8861 IP Phone 8865 IP Phone 8865 with Multiplatform Firmware Unified IP 8831 Conference Phone Unified IP 8831 Conference Phone for Third-Party Call Control For information about affected software releases, consult the Cisco bug ID (s) at the top of this advisory. 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 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 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 This vulnerability was found during the resolution of a Cisco TAC support case. 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-20190220-cdp-lldp-dos Revision History o +---------+----------------------+------------+--------+------------------+ | Version | Description | Section | Status | Date | +---------+----------------------+------------+--------+------------------+ | | Added additional | | | | | | CDETS defect | | | | | 1.1 | identifiers. Updated | Vulnerable | Final | 2019-March-09 | | | the list of | Products | | | | | vulnerable phone | | | | | | models. | | | | +---------+----------------------+------------+--------+------------------+ | 1.0 | Initial public | - | Final | 2019-February-20 | | | release. | | | | +---------+----------------------+------------+--------+------------------+ - --------------------------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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