12 June 2017
Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2017.1463 Cisco IP Phone 8800 Series SIP Denial of Service Vulnerability 12 June 2017 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Cisco IP Phone 8800 Series Publisher: Cisco Systems Operating System: Cisco Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2017-6656 Original Bulletin: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170607-sip - --------------------------BEGIN INCLUDED TEXT-------------------- Cisco Security Advisory Cisco IP Phone 8800 Series SIP Denial of Service Vulnerability Medium Advisory ID: cisco-sa-20170607-sip First Published: 2017 June 7 16:00 GMT Version 1.0: Final Workarounds: No workarounds available Cisco Bug IDs: CSCvc29353 CVE-2017-6656 CWE-20 CVSS Score: Base 6.8, Temporal 6.8 CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H/E:X/RL:X/RC:X CVE-2017-6656 CWE-20 Summary A vulnerability in Session Initiation Protocol (SIP) call handling of Cisco IP Phone 8800 Series devices could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition due to the SIP process unexpectedly restarting. All active phone calls are dropped as the SIP process restarts. The vulnerability is due to incomplete input validation of the SIP packet header. An attacker could exploit this vulnerability by sending a malformed SIP packet to a targeted phone. An exploit could allow the attacker to cause a DoS condition when all phone calls are dropped, due to the SIP process unexpectedly restarting. 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-20170607-sip Affected Products Vulnerable Products This vulnerability affects Cisco IP Phone 8800 Series. 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. 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. Cisco Security Vulnerability Policy 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. Subscribe to Cisco Security Notifications Subscribe URL https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170607-sip Revision History Version Description Section Status Date 1.0 Initial public release. Final 2017-June-07 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. Cisco Security Vulnerability Policy 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. Subscribe to Cisco Security Notifications Subscribe - --------------------------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 email@example.com 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: firstname.lastname@example.org 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 iQIVAwUBWT4PzIx+lLeg9Ub1AQjLlA//QnUFxznb+BhRhHyVfJfp3ejZGaw4V6uZ nl50ZsLCjCK5YzoP4oR6QfOT7fzUhGVR7rbkgpZ2I3Y1D0gpMU0gWKJvibGJ2BaB j9JCr/gd2SYmth1xLTuOlrOF3u9oTBaKhG9ty5IfHF0NrG2G8nwQ4Y2no6+5Nmd2 FSdNLNnnOVayh85ABolY6CiZcjAKxTsBB91Nozsip8mo2vz8WTpzptu4TZjCfMys +UQDNY8qszJSg+GNh/Tx30cgJKhJvwyoJW9E983JKx/1OX+mUO1t1odutqyI7hWZ 4MUglyw+irlnTOqmY9ApvATJTyaWhYgKJAysnmF3+LqoSuIy1fSkLPDT681ngbfh 3BOnvsxy6RdSvfyyAwdluJEUzQAexIWQ3oQyxMriiJ+QomR2sUQ1+iMbZdJ7LKOD QOowl5eJaNLt5y5/VkaN2SQSUdjpaQg9F/dat+yRj7E277miucvI54mZgHqXAw0x 5TMOt4cDJO67w6u4z1I/LcIodhXMcCilC8Y2Qzvmk0rVnZuuYjtBN575iNtZqQcX N7zXvBgXoSL8mItIqlRj7NdgrDKGhNaIyuUX/1ARWxSHg4nXbWZD1p6uSqNslSYi kMqJJFGyXF0+ltlY3mMcfTpYj4Yu2FGamnP2L4DbQlNuuNiSYRhEcpxMsz2LG4wh UN7iCzar9c0= =U/k6 -----END PGP SIGNATURE-----