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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2015.1176 Cisco StarOS for Cisco ASR 5000 Series HAMGR Service Proxy Mobile IPv6 Processing Denial of Service Vulnerability 29 April 2015 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Cisco ASR 5000 Series Software Publisher: Cisco Systems Operating System: Cisco Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2015-0711 Original Bulletin: http://tools.cisco.com/security/center/viewAlert.x?alertId=38557 - --------------------------BEGIN INCLUDED TEXT-------------------- Vulnerability Alert Cisco StarOS for Cisco ASR 5000 Series HAMGR Service Proxy Mobile IPv6 Processing Denial of Service Vulnerability Threat Type: CWE-399: Resource Management Errors IntelliShield ID: 38557 Version: 1 First Published: 2015 April 28 20:56 GMT Last Published: 2015 April 28 20:56 GMT Port: Not available CVE: CVE-2015-0711 Urgency: Unlikely Use Credibility: Confirmed Severity: Mild Damage CVSS Base: 5.0 CVSS Version 2.0 CVSS Temporal: 4.1 Version Summary: Cisco StarOS for Cisco ASR 5000 Series devices contain a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition. Updates are available. Description A vulnerability in proxy mobile (PM) IPv6 processing of Cisco StarOS for Cisco ASR 5000 Series devices could allow an unauthenticated, remote attacker to cause a reload of the hamgr service on the affected device. The vulnerability is due to improper processing of malformed IPv6 PM packets. An attacker could exploit this vulnerability by sending a number of malformed IPv6 PM packets to an affected device. An exploit could allow the attacker to cause the hamgr service on the affected device to reload. A reload of the hamgr service may cause new calls to fail during a recovery period, 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 ASR 5000 Series Software version 18.1.0.59776 was vulnerable. Later releases of Cisco ASR 5000 Series Software may also be vulnerable. IntelliShield Analysis To exploit this vulnerability, an attacker may need access to trusted, internal networks to send malformed IPv6 PM packets to the targeted device. This access requirement may reduce 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 CSCut94711 for registered users that contains additional details and an up-to-date list of affected product versions. Impact An unauthenticated, remote attacker could exploit this vulnerability to cause the hamgr service on an affected device to reload, resulting in a DoS condition. Technical Information The vulnerability is due to improper processing of malformed IPv6 PM packets by an affected device. An unauthenticated, remote attacker could exploit this vulnerability by sending a number of malformed IPv6 PM packets to an affected device. An exploit could allow the attacker to cause the hamgr service on the device to reload, 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 can help protect affected systems from external attacks by using a solid firewall strategy. 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 5000 Series Software 18.1 .0.59776 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. 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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 iQIVAwUBVUB8hhLndAQH1ShLAQJgvQ/8CI53POYZ4DN9e6KYBarcT5b/2+jXj4QO ayb2bTAm/Iwv3JgcU2ByDVRk/jSumziBoUbPWBMl79pOHbOnnOiwufuVTuG/51nM vqY2pl5wETM88eiSUGizYB5zjQ6Tc830W/eQSbJpQq7hrfgra2qFpqHilfhwXOpi XP+IPF9PvmcQmjhGDaUw9K76XRd6DvEB+kJcbWjTwT0g7gAGp9QK7AiYR5YkbQKE 7DNn/fk3A3xyh0tUtwWmQD7+dIBPS5oroy1PK5kM9SIpaal+SSc8UWrYzd6y97dd tXjmb6b3Fde9NzOsB0mFY+OmkZ6BT2cNFqrJLYLNhoHf+wHljP8RXmXtUf2Qh/Ap bkbBjDHMGQrYgxt78WFYU7SkD4l6q5MgYARzaIlBjINSbYpv/fjNPFGMIFflqDh9 vSMQ0Uw68B/v6IIXmkteTis8ubAzXx86fd4AxvL081FPpKw316jeDgkx6VZBIKb0 th2W3PyyDr9WxZs43ZtTxIsdreWpENEmmhb9tiEccw2QiiMrd7w1tZzrAGkL2W5+ OXFCJc25oGVOhip+8FuLttpEKs0xXXFmxq/5pCbOCVO9b5bTL1FHcL7QTWyijsG3 f4joVG6RAdo7vgBMARoGpYPOaO/DTm5oXv1G24VMJ3OY5J/fs0suwpzJ6ZqsCmQ5 bfTrLvhI93s= =FfI3 -----END PGP SIGNATURE-----