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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2016.1565 Cisco Integrated Services Routers OpenSSH TCP Denial of Service Vulnerability 21 June 2016 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Cisco Integrated Services Routers 800, 819, and 829 Publisher: Cisco Systems Operating System: Cisco Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Mitigation CVE Names: CVE-2015-6289 Original Bulletin: http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160620-isr Comment: There are currently no patches available for this vulnerability. In the meantime, administrators should consider risk reduction strategies such as restricting external network access. - --------------------------BEGIN INCLUDED TEXT-------------------- Cisco Security Advisory Cisco Integrated Services Routers OpenSSH TCP Denial of Service Vulnerability Medium Advisory ID: cisco-sa-20160620-isr Published: 2016 June 20 20:45 GMT Version 1.0: Final CVSS Score: Base - 5.0 Workarounds: No workarounds available Cisco Bug IDs: CSCuu13476 CVE-2015-6289 CWE-399 Summary A vulnerability in the handling of Secure Shell (SSH) TCP packets in the Cisco Integrated Services Routers (ISR) models 800, 819, and 829, could allow an unauthenticated, remote attacker to cause a partial denial of service (DoS) condition due to low memory on the device. The vulnerability is due to the handling of out-of-order, or otherwise invalid, TCP packets on an SSH connection to the device. An attacker could exploit this vulnerability by connecting via SSH to the device and then crafting TCP packets which are out of order or have invalid flags. An exploit could allow the attacker to cause the device to report low-memory warnings which could in turn cause a partial DoS condition. Cisco has not released software updates that address this vulnerability. Workarounds that mitigate this vulnerability are not available. This advisory is available at the following link: http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160620-isr Affected Products Vulnerable Products Cisco ISR models 800, 819, and 829 running Cisco IOS Software Release 15.5(3)M are vulnerable. Products Confirmed Not Vulnerable No other Cisco products are currently known to be affected by this vulnerability. Workarounds Workarounds are not available. Fixed Software Cisco provides information about fixed software in Cisco bugs, which are accessible through the Cisco Bug Search Tool. When considering software upgrades, customers are advised to consult the Cisco Security Advisories and Responses archive at http://www.cisco.com/go/psirt and review subsequent advisories 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. URL http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160620-isr Revision History Version Description Section Status Date 1.0 Initial public release. - Final 2016-June-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. 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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 iQIVAwUBV2im/ox+lLeg9Ub1AQhz0w/8CmYnW+Zsx8gG8cg8D4yWNsiVzuFqW03g jBQgTTQ/i7UjhaFeTkMicnGrD57caAmHW0IyoiLuIgVFFRq0Y0G++xj8MBtHAprZ 4rAKHu3Xz9l6FvBrFicNM3v8C/MZyguOSXPwLN8puCngaLQnTvSwSrh6+SGJdEGJ 4NPQH+3xgUDxACALi9gMHtE7HRADy8nBnF6dEP/9lTpZBA1QZa4EDyo8AYpELuRZ tbqUP3x9VmOkewARZXvBuxyecVSgu4ylCYU6o1/MabTuGT8r6/0cheOsU/6B9Wai n8/uzZ+9nlPFj2aiAalvBmaLATLt2siFm6YY9AdrepgYAF7xEyY7vwbEQn3EzugH YEyK3EluKb9WrhHSK0ZVi1i6tt3gHeOMjnVS3nhTIEVvYzFkuhGZvJ/dAB3uhuV+ xq0f8USS438S/jk5siNzqVwJLtVpWXYMhcvO0ZDK8mWjVvN0BjYqyHotttohnRwZ Q37Agb4LUKGGcvg56KMGtwtXGIxqpiuwVun4YiTK2ajgItq9DO3ItMHTfsfMj7Zn RDAhQhdCjBQe326lhBAZkcZ3Erebg2rWQKaxthmPYM7LkGljnzG0YWXb1xCWYkoY jdJAbLY499bjoAFyblHLy62IqW1M+uFrOjLLKDgItcHstzPr3ye/y4V7PwebJPqB HA+GgvalvNA= =Vmzi -----END PGP SIGNATURE-----