Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2014.1475 Cisco 1800 Series ISR ISDN Basic Rate Interface Denial of Service Vulnerability 29 August 2014 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Cisco 1800 Series ISR Publisher: Cisco Systems Operating System: Cisco IOS Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Mitigation CVE Names: CVE-2014-3347 Original Bulletin: http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2014-3347 Comment: Mitigation of this vulnerability by restricting knowledge of the ISDN number for affected systems connected to public switched networks is recommended. - --------------------------BEGIN INCLUDED TEXT-------------------- Cisco Security Notice Cisco 1800 Series ISR ISDN Basic Rate Interface Denial of Service Vulnerability http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2014-3347 CVE ID: CVE-2014-3347 Release Date: 2014 August 27 18:40 UTC (GMT) Last Updated: 2014 August 28 15:58 UTC (GMT) Related Documents: Summary Cisco 1800 Series Integrated Services Routers (ISR) contain a vulnerability in the hardware entropy collection module when the Integrated Services Digital Network (ISDN) Basic Rate Interface (BRI) is configured and connected to a public switched network. This could allow an attacker with knowledge of the ISDN phone number of the affected device to trigger a denial of service (DoS) condition. The vulnerability is due to an interrupt timer collision that causes the hardware encryption module to enter a corrupted state, causing the device to become unresponsive. An attacker would need to perform the attack exactly when the device polls the hardware encryption module to perform entropy collection. The affected devices have reached the End of Software Maintenance milestone. Fixed software will not be released. Affected Products Product More Information CVSS IOS CSCul77897 5.4/4.9 What Is a Cisco Security Notice? The Cisco Product Security Incident Response Team (PSIRT) publishes Cisco Security Notices to inform customers of low- to mid-level severity security issues involving Cisco products. Customers who wish to upgrade to a software version that includes fixes for these issues should contact their normal support channels. Free software updates will not be provided for issues that are disclosed through a Cisco Security Notice. For additional information about Cisco PSIRT publications, see the Cisco Security Vulnerability Policy at http://www.cisco.com/web/about/security/psirt/security_vulnerability_policy.html Customers Using Third-Party Support Organizations Customers may have Cisco products that are provided or maintained through prior or existing agreements with third-party support organizations, such as Cisco Partners, authorized resellers, or service providers. For these products, customers should consult their service providers or support organizations to ensure that any applied workaround or fix is the most appropriate in the intended network before it is deployed. 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 stand-alone 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. - --------------------------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 iQIVAwUBU//qzhLndAQH1ShLAQLhqg/+IJl8qq5SdFMODRZsMLwlYxyZwBzv+CZC r/ZOtE2LlmUR3Vak9Te/R+29LfL4gjdW9Zx69T7nh1gQ9/RDdCWGhKwmniwuS3Ox X420LzhtWvfIAGmI3wMSAseh+KBgk48liaZ+wxBmbmphiqgf5fYvStOFgtTX70n1 uQFEwOBrADkajYr1GVyMyclgaa66p31n+SMdMjxzEh7EAOMbS2GPxz3yH8EvJsZr vaLPprGJwq8B6vTTP51tAR08tCQkaOsqb1AT0qw/xpHB4v9PF1/31z3BI+IpoCBV vLfFrJGPRqEROhN9S+HCZN/slxBd7hEpFZW3gOV+361suIQvZHr4S1Kr612kTAHZ 49RSVYQ83jq6GllanTnn2sd8xEULUgo0RjxccGo24gAsWRkPEw9eYMV3RC9xn5j5 i0pEzqy9LNZBW9R+VtAq4niI6QJJpmDBAyOeEt0pt6gax/v0XvCWu1O+3KTJMWtA U37rWAgu4IP6WqnKjY/1yJudNAOBrcsUaSIooVy4QyaqswRe4HALOGYZ6oYxrRVc 8F1iw8IjiWTBylwhN2enlcNZR5Me4preJW8gQL52jnciAj3CzTDE/BflfrWQM80W m9tCrj7Uu6ZbXW8e1cdGgA37qTYJLbRDWKS8R3iQ7HIWATYC7uimWUXp/+sxQcGo D41vTy5lKkE= =ovWX -----END PGP SIGNATURE-----