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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2017.2393 Cisco Small Business SPA300, SPA500, and SPA51x Series IP Phones Denial of Service Vulnerability 21 September 2017 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Cisco Small Business SPA300 IP Phone Cisco Small Business SPA500 IP Phone Cisco Small Business SPA51x Series IP Phones Publisher: Cisco Systems Operating System: Cisco Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2017-12219 Original Bulletin: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170920-spa - --------------------------BEGIN INCLUDED TEXT-------------------- Cisco Security Advisory Cisco Small Business SPA300, SPA500, and SPA51x Series IP Phones Denial of Service Vulnerability Medium Advisory ID: cisco-sa-20170920-spa First Published: 2017 September 20 16:00 GMT Version 1.0: Final Workarounds: No workarounds available Cisco Bug IDs: CSCve82586 CVSS Score: Base 7.5 Base 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:X/RL:X/RC:X CVE-2017-12219 CWE-399 Summary A vulnerability in the handling of IP fragments for the Cisco Small Business SPA300, SPA500, and SPA51x Series IP Phones could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition. The vulnerability is due to the inability to handle many large IP fragments for reassembly in a short duration. An attacker could exploit this vulnerability by sending a crafted stream of IP fragments to the targeted device. An exploit could allow the attacker to cause a DoS condition when the device unexpectedly reloads. 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-20170920-spa Affected Products Vulnerable Products This vulnerability affects Cisco Small Business SPA300, SPA500, and SPA51x Series IP Phones in all software versions. 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. Details Cisco Small Business SPA300, SPA500, and SPA51x Series IP Phones are typically deployed within Small Business/Home (SOHO) network environments. For additional information about best practices for securing these devices, please refer to How to Protect Your Voice: Tips on IP Phone Security. 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 Cisco would like to thank Marc Bolos from Pixelxen for finding and reporting this vulnerability. URL https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170920-spa Revision History Version Description Section Status Date 1.0 Initial public release. -- Final 2017-September-20 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: http://www.auscert.org.au/render.html?cid=1980 =========================================================================== 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 iQIVAwUBWcNAnIx+lLeg9Ub1AQjrQw/+Lzqu5syjgZlL7dPxScYsNWw5nk1g9QKz 7BiPqbjAbCTe6eh6GeKLcKA0w9/yJM9Ewk9lypawi3GBZLSBne9I+DpsDseaA9Qx 4nL2a2zBdzJsEVAzmVe+d1A8sHoPJ+hFPI97SgPR0quYRXLM/Hay0nsgZjOKaVc0 Yngx0YUA9DyVg9AkdMVOz8neYcMx/kIobjNh+E235VpTz9wrSjIo1z9/m1JR8Qym l/1kOMLOIlBbCeNZNvJV+C7bDrPZtAT2+qPe4/S2zUeqqObE4m1by21nBmgDLz1d FbIqFexJHL6RWXPWYq6O4yuLdJzI6T9L1OeItyeLdf9u30RepIgttm7fnWxrnF3+ ak94Lmn+Tb50TGg83jXVix8ijDtfzgXE8fi3hr6KTMmVppldXXsa2ls1/NNkGUem yiUwaSpw+dr1+dr/vTj/4ME95TKhkHFG8DMa77D3vVsbJuEnIdPEgqjjYAV8zl9Y isNT9m/eO5inXVNoKS3XshW+MGBkBqHrNNVkeCITCZGlORme8aDilIyVUCujNMmp UwaaNTCenIynS1UdLKnBNE90KMQ0XGrmdEdGrwwZABs6uf/Wio3tT/chWyaeznFj +hYFG8tX+/tMHQ6ZLDlrVhhLJW8BYskZPK4PCbiqY5cBpEds6eEMp0eDe9aG2fBM m1VJT4qxXHQ= =D1af -----END PGP SIGNATURE-----