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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2015.1794 Cisco Adaptive Security Appliance Software OSPFv2 Denial of Service Vulnerability 8 July 2015 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Cisco Adaptive Security Appliance (ASA) Software Publisher: Cisco Systems Operating System: Cisco Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2015-4241 Original Bulletin: http://tools.cisco.com/security/center/viewAlert.x?alertId=39641 - --------------------------BEGIN INCLUDED TEXT-------------------- Vulnerability Alert Cisco Adaptive Security Appliance Software OSPFv2 Denial of Service Vulnerability Threat Type: CWE-399: Resource Management Errors IntelliShield ID: 39641 Version: 1 First Published: 2015 July 07 20:49 GMT Last Published: 2015 July 07 20:49 GMT Port: Not available CVE: CVE-2015-4241 Urgency: Unlikely Use Credibility: Confirmed Severity: Mild Damage CVSS Base: 6.1 CVSS Version 2.0 CVSS Temporal: 5.0 Version Summary: Cisco Adaptive Security Appliance contains a vulnerability that could allow an unauthenticated, adjacent attacker to cause a denial of service condition. Updates are available. Description A vulnerability in the Open Shortest Path First version 2 (OSPFv2) code of Cisco Adaptive Security Appliance (ASA) Software could allow an unauthenticated, adjacent attacker to cause the reload of the affected system. The vulnerability is due to improper handling of OSPFv2 packets. An attacker could exploit this vulnerability by sending crafted packets to the affected system. A successful exploit could cause the system to crash, resulting in a denial of service (DoS) condition. Cisco has confirmed the vulnerability and released software updates. Warning Indicators At the time this alert was first published, Cisco ASA Software release 9.3(2) was vulnerable. Later releases of Cisco ASA Software may also be vulnerable. IntelliShield Analysis To exploit this vulnerability, an attacker must be on the same broadcast or collision domain as the targeted system. This access requirement reduces the likelihood of a successful 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 CSCut52679 for registered users, which contains additional details and an up-to-date list of affected product versions. Impact An unauthenticated, adjacent attacker could exploit this vulnerability to cause an affected system to crash, resulting in a DoS condition. Technical Information The vulnerability is due to improper handling of OSPFv2 packets by an affected system. An unauthenticated, adjacent attacker could exploit this vulnerability by sending crafted OSPFv2 packets to a targeted system. A successful exploit could cause the system to crash, 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 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 Adaptive Security Appliance (ASA) Software 9.3 .2 Associated Products: N/A Alerts and bulletins on the Cisco Security Intelligence Operations Portal are highlighted by analysts in the Cisco Threat Operations Center and represent a subset of the comprehensive content that is available through Cisco Security IntelliShield Alert Manager Service. This customizable threat and vulnerability alert service provides security staff with access to timely, accurate, and credible information about threats and vulnerabilities that may affect their environment. 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. 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