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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2015.1646 Cisco IOS Software UBR Devices SNMP Subsystem Denial of Service Vulnerability 25 June 2015 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Cisco IOS Software Publisher: Cisco Systems Operating System: Cisco Impact/Access: Denial of Service -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2015-4204 Original Bulletin: http://tools.cisco.com/security/center/viewAlert.x?alertId=39440 - --------------------------BEGIN INCLUDED TEXT-------------------- Vulnerability Alert Cisco IOS Software UBR Devices SNMP Subsystem Denial of Service Vulnerability Threat Type: CWE-399: Resource Management Errors IntelliShield ID: 39440 Version: 1 First Published: 2015 June 22 16:04 GMT Last Published: 2015 June 22 16:04 GMT Port: Not available CVE: CVE-2015-4204 Urgency: Unlikely Use Credibility: Confirmed Severity: Mild Damage CVSS Base: 6.8 CVSS Version 2.0 CVSS Temporal: 5.6 Version Summary: Cisco Universal Broadband Routers running Cisco IOS Software contain a vulnerability that could allow an authenticated, remote attacker to cause a denial of service condition. Updates are available. Description A vulnerability in the SNMP subsystem of Cisco Universal Broadband Router devices could allow an authenticated, remote attacker to cause a crash of the Parallel Express Forwarding (PXF) process on the Performance Routing Engine (PRE) module. The vulnerability is due to a memory leak that occurs when certain values in docsIfMCmtsMib are polled via SNMP. An attacker who can authenticate and submit SNMP requests to an affected device could poll the affected element at a high rate and quickly exhaust process memory, resulting in a crash. Cisco has confirmed the vulnerability and released software updates. Warning Indicators Cisco uBR10000 Series Universal Broadband Routers running Cisco IOS Software are affected. IntelliShield Analysis To exploit this vulnerability, an attacker must authenticate to the targeted device. This access requirement decreases 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 CSCue65051 for registered users, which contains additional details and an up-to-date list of affected product versions. Impact An authenticated, remote attacker could exploit this vulnerability to cause the PXF process on the PRE module on an affected device to crash, resulting in a denial of service (DoS) condition. Technical Information The vulnerability is due to a memory leak that occurs when certain values in docsIfMCmtsMib are polled via SNMP by an affected device. An attacker who can authenticate and submit SNMP requests to an affected device could poll the affected element at a high rate and quickly exhaust process memory, 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 allow only privileged users to access administration or management 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 IOS 12.2 12.2(33) 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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