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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2017.2250 Cisco Yes Set-Top Box Denial of Service vulnerability 7 September 2017 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Cisco Yes Set-Top Box Publisher: Cisco Systems Operating System: Cisco Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2017-6631 Original Bulletin: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170906-stb - --------------------------BEGIN INCLUDED TEXT-------------------- Cisco Yes Set-Top Box Denial of Service vulnerability Medium Advisory ID: cisco-sa-20170906-stb First Published: 2017 September 6 16:00 GMT Version 1.0: Final Workarounds: No workarounds available Cisco Bug IDs: CSCvd08812 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-2017-6631 CWE-399 Summary A vulnerability in the HTTP remote procedure call (RPC) service of set-top box (STB) receivers manufactured by Cisco for Yes could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability exists because the firmware of an affected device fails to handle certain XML values that are passed to the HTTP RPC service listening on the local subnet of the device. An attacker could exploit this vulnerability by submitting a malformed request to an affected device. A successful attack could cause the affected device to restart, resulting in a DoS condition. Yes has updated the affected devices with firmware that addresses this vulnerability. Customers are not required to take action. 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-20170906-stb Affected Products Vulnerable Products This vulnerability affects YesMaxTotal, YesMax HD, and YesQuattro STB devices. For information about affected 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 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 reported to Cisco by Yaron Klein. URL https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170906-stb Revision History Version Description Section Status Date 1.0 Initial public release. - Final 2017-September-06 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. 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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 iQIVAwUBWbC82Yx+lLeg9Ub1AQgSWw//Z14GioPLaDXRiz8pGTJTFV0gLUttk/dz 9itDihR92hnYzPM38LSM2aSYu8spYY0YJyE6tXvAhl3lc7yeDVPZoLRGpzqvyfpE J5JIkzKGEY1lMD/77mUstlK5JDg30DdXNVEYLoASelSqL7hQxltTcVo3K6oY2Ani DhLhqfZKmi4GzFpVkBtcZc26/pio1FKfUg8zc1jL05fV4wGowFtXQvfJImVJ536G qenij/zp/Buc2nzJnHApWcOwChJYyh0liAWwp2RhzabAHVt113+XR/IRxWcgZIWv uI6ATfG3be3SRXk64DDUyomELHeRhfvjMDji1WvCS8UeKa+TWRNC7ei/nsMAFwvr tcXNeL0xNZgHJ/trm+Ec6GKCYlIgJRm1Ys7Aux/bOKq6qFNmwP0t0E7fVSvX3Ylp paJq8SoLU/a0nPoo0gIGs8MVhw6IeIbtvo1I7BKKN2zEX7FpPXEdgUnS1m5NrZDo 0XSwQf9Ce0J1gvRkSDwFJxJi4sTgxXIpklNFhLLAjIiuDPwc8AgOoQsP4frqQH/+ 9UccVhR9kNEoSacByILZ3KMw012msofL6YWD7TfCZa3NotYKWqnD+MqOeupEDeWM 0tWFL6lRXwBKZvB4yAEQWiKdKruVaJG45djZ0PwAMDsRY4/8oHCT/TZKzfuknL+N j8w4/YRNGC8= =63gf -----END PGP SIGNATURE-----