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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2015.2467 Cisco ASR 9000 Series Aggregation Services Routers Denial of Service Vulnerability 22 September 2015 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Cisco ASR 9000 Routers Publisher: Cisco Systems Operating System: Cisco Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2015-6301 Original Bulletin: http://tools.cisco.com/security/center/viewAlert.x?alertId=41101 - --------------------------BEGIN INCLUDED TEXT-------------------- Vulnerability Alert Cisco ASR 9000 Series Aggregation Services Routers Denial of Service Vulnerability Threat Type: CWE-399: Resource Management Errors IntelliShield ID: 41101 Version: 1 First Published: 2015 September 18 20:54 GMT Last Published: 2015 September 18 20:54 GMT Port: Not available CVE: CVE-2015-6301 Urgency: Unlikely Use Credibility: Confirmed Severity: Mild Damage CVSS Base: 5.0 CVSS Temporal: 4.1 Version Summary: Cisco ASR 9000 Routers contain a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition. Updates are available. Description A vulnerability in the DHCP version 6 (DHCPv6) server implementation of Cisco IOS Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. The vulnerability is due to improper handling of certain DHCPv6 packets. An attacker could exploit this vulnerability by sending these DHCPv6 packets to be processed by an affected device. An exploit could allow the attacker to cause a reset of an affected process. Cisco has confirmed the vulnerability and released software updates. Warning Indicators At the time this alert was first published, Cisco 9000 Series Aggregation Services Router (ASR) devices with Cisco IOS based software version 5.2.0 (Base) were vulnerable. Other versions may also be affected. IntelliShield Analysis To exploit this vulnerability a remote attacker does not need to authenticate to pass the crafted DHCPv6 packets to the targeted device. This increases the likelihood of a possible exploit. Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available. Vendor Announcements Cisco has released bug ID CSCun72171 for registered users, which contains additional details and an up-to-date list of affected product versions. Impact An unauthenticated, remote attacker could exploit this vulnerability to cause a process to reset on an affected device, resulting in a DoS condition. Technical Information The vulnerability is due to improper handling of certain DHCPv6 packets by the affected device. An attacker could exploit this vulnerability by sending crafted DHCPv6 packets to be processed by the affected device. A successful exploit could allow the attacker to reset a process on the affected device, resulting in a DoS condition. Safeguards Administrators are advised to apply the appropriate updates. Administrators are advised to allow only trusted users to have network access. Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems. Administrators are advised to monitor affected systems. Patches/Software Cisco customers with active contracts can obtain updates through the Software Center at the following link: Cisco. Cisco customers without contracts can obtain upgrades by contacting the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via email at tac@cisco.com. Alert History Initial Release Product Sets The security vulnerability applies to the following combinations of products. Primary Products: Cisco Cisco ASR 9000 Series Aggregation Services Routers 5.2.0(ED) Base Associated Products: N/A LEGAL DISCLAIMER The urgency and severity ratings of this alert are not tailored to individual users; users may value alerts differently based upon their network configurations and circumstances. THE ALERT, AND INFORMATION CONTAINED THEREIN, ARE PROVIDED ON AN "AS IS" BASIS AND DO NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE ALERT, AND INFORMATION CONTAINED THEREIN, OR MATERIALS LINKED FROM THE ALERT, IS AT YOUR OWN RISK. INFORMATION IN THIS ALERT AND ANY RELATED COMMUNICATIONS IS BASED ON OUR KNOWLEDGE AT THE TIME OF PUBLICATION AND IS SUBJECT TO CHANGE WITHOUT NOTICE. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE ALERTS AT ANY TIME. - --------------------------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 iQIVAwUBVgDlgn6ZAP0PgtI9AQJLvxAArL+jg4Nm/2szUddt3OOj/cWjtWj/wKbs hvtz2MzTsugMyqApyzM8nLcHpCy+pCwfq0xZ1PWEh8K3VQMwnucRTzBS3lV2xJB8 D/EPpyoEINgX9duHwMs1gmIUQOmzmWgbFUbDqpOGvZlIAmBqF/58s3G0jnys7El/ hw8kH+p+dgof83ZwD7hXAbL3tEnEDg+0Fh2xbM8lKp9MtTTqbVSz22BIsn5859ey MqS99YN1bFHENONtc7Yf7LkYtUyTw9HbX/CmvIElUTMv05n+opmTJDCKNxizRq79 PPGgLm/u6NE98pQpoBgR99k+KQjPbdY6DX5Rvuhr9dFSoVL73vISTy8NDH8+F7e2 NdqONfEgv/l6HfsZ0LCo5BElkIHDcqRJ2VVMQxTLsvmAxn9H1TK4Wor0zF6jGL0v TzchyuTq3VAMr2BS1UfRkhoCVJpHRGhI0FEvZ3+l6N2u0TyjDfsfUHurdUKBRjPQ uAK2X2PNu9XRy2/4wauLopjRzDT3LpJdnv9tDGWUWOCflm83vBZPfTI9XTWoAhM4 DDfrYML0Sp+HyRnpdT+Ga1IohAKk/06UxMKtnGW710Xdz607LsJR93zD4VUvJeyk lprN1KX+cxKytZXRDvi8NeNUW8xiFLRd1KbzSkLY2vDPGV2G1SHlMB5osZ1Lsx2R BnkMlK8YXUk= =BhyS -----END PGP SIGNATURE-----