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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2017.2936 Cisco Spark Board Upgrade Signature Verification Bypass Vulnerability 16 November 2017 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Cisco Spark Board Publisher: Cisco Systems Operating System: Cisco Impact/Access: Increased Privileges -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2017-12306 Original Bulletin: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20171115-spark - --------------------------BEGIN INCLUDED TEXT-------------------- Cisco Spark Board Upgrade Signature Verification Bypass Vulnerability Medium Advisory ID: cisco-sa-20171115-spark First Published: 2017 November 15 16:00 GMT Version 1.0: Final Workarounds: No workarounds available Cisco Bug IDs: CSCvf84502 CVE-2017-12306 CWE-16 CVSS Score: Base 4.4 CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N/E:X/RL:X/RC:X CVE-2017-12306 CWE-16 Summary A vulnerability in the upgrade process of Cisco Spark Board could allow an authenticated, local attacker to install an unverified upgrade package. The vulnerability is due to insufficient upgrade package validation. An attacker could exploit this vulnerability by providing the upgrade process with an upgrade package that the attacker controls. An exploit could allow the attacker to install custom firmware to the Spark Board. 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-20171115-spark Affected Products Vulnerable Products This vulnerability affects Cisco Spark Board. 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 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-20171115-spark Revision History Version Description Section Status Date 1.0 Initial public release. Final 2017-November-15 Show Less 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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On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBWg0zgox+lLeg9Ub1AQg0ng/8ClbNDl2pxmFwMC/v8aHu18Rlth7pV0tI /mXpUJz9sHGRdWLxFN0QdB6xtYFwEnGqIj5Vd/eSZjNEBtyve+L9JXtPphO8FAYI qOK2RnYfbyw88nUysIpKsSaa++YdIMVCs/XgPxXNy7NwC5Oy00S32ckVesylYU0I CiVE14z1CI+HxT7HsrRPJr3ANgVZDNQ1iNY9V+pBN3ZJ4SK2Wcf7Pc8S4NZPlqqb +6rUV4qMhce2g6YVjs9x4zF0zzg65AKZiqFsgCnEu53Nm1c0uO4rRu5U522WLdPN m3VXsj7fMxeBbAF24dJ0r0XmW7mwMUsuEaPhQW6akU9s84vjy03GlvfMnh+1NilG K5VjE0CMRjIDJnXrQpryujbIVOG7cH+Md+JOENJpfzrEDcdJh2dos8Z3fFF+TBW9 KsVoil+pq7ECSKpFWGITtxcz5L3mAqPwHj8L/NnUgkg8l6fMvvi+fpDpVAURJbeM 9PwCPOXJwd/F7TGlhCZi8yG6ljV0KgWn8QGwOK6sF8n5vRdXYsBmaGLT1BCqfsZl 4YnbtRbPdh4hcPA933R0q5/P0iU7AJPhVU7kj8Pf6a95KLg2DF5xMJxJofwSaYXO YtyHEllmvG6ES7RKu0qXoTFIb4Ve77zHE2iZp3VsD46GF+WcN/DpsaBs3CkBajwa ytm8DGnoVqI= =HCZ+ -----END PGP SIGNATURE-----