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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2015.1723 Cisco Unified IP Phones 9900 Series Denial of Service Vulnerability 30 June 2015 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Cisco Unified IP Phones 9900 Series Firmware Publisher: Cisco Systems Operating System: Cisco Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2015-4226 Original Bulletin: http://tools.cisco.com/security/center/viewAlert.x?alertId=39554 - --------------------------BEGIN INCLUDED TEXT-------------------- Vulnerability Alert Cisco Unified IP Phones 9900 Series Denial of Service Vulnerability Threat Type: CWE-399: Resource Management Errors IntelliShield ID: 39554 Version: 1 First Published: 2015 June 29 18:05 GMT Last Published: 2015 June 29 18:05 GMT Port: Not available CVE: CVE-2015-4226 Urgency: Unlikely Use Credibility: Confirmed Severity: Mild Damage CVSS Base: 4.3 CVSS Version 2.0 CVSS Temporal: 3.6 Version Summary: Cisco Unified IP Phones 9900 Series contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition. Updates are available. Description A vulnerability in the packet storing capabilities of Cisco 9900 Series IP Phones could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. The vulnerability is due to how the phone decoder handles certain real-time transport protocol (RTP) packets. An attacker could exploit this vulnerability by calling a registered phone, waiting for a user to answer, then send malformed RTP packets to the users phone. A successful exploit could cause the phone to become unresponsive, resulting in a DoS condition. Cisco has confirmed the vulnerability and released software updates. Warning Indicators At the time this alert was first published, Cisco Unified IP Phones 9900 Series release 9.3(2) was vulnerable. Later releases of Cisco Unified IP Phones 9900 Series may also be vulnerable. IntelliShield Analysis To exploit this vulnerability, an attacker must first call a targeted phone and then rely on a user to answer the phone prior to sending malformed RTP packets. The attacker can not exploit this vulnerability without this requirement. 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 CSCur39976 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 an affected device to become unresponsive, resulting in a DoS condition. Technical Information The vulnerability is due to improper handling of certain RTP packets by the decoder on an affected device. An unauthenticated, remote attacker could exploit this vulnerability by calling a targeted phone and waiting for the user to answer the phone. If the user answers the phone, the attacker could then send malformed RTP packets to the phone causing the phone to become unresponsive, resulting in a DoS condition. Safeguards Administrators are advised to apply the appropriate updates. 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 Unified IP Phones 9900 Series Firmware 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. 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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 iQIVAwUBVZIm3H6ZAP0PgtI9AQIAQA//Tjp6MdllQCdvOaz8HKxMUnZfwO7PCrsc fhCpLaG2n9cA6yVHQhoYcLYngNItYXBDE+XrExh/3jSikH1A7UyA3IWMzWqnky78 PskMQYHmi7aq6+yMUv9JhP7vxx6HBenI7yUqeNdUJeQBDG4ESfKHjnAzbF9z7eg3 6/t5TMCY7loaaxa3op0YJtKcHu2ZXA/WZdMLKfHPhkmLNIy5cPp8r5ZiGCCL7QIB qoZS2jcsmN5ymjySpLEwODU7GE+KpRGdG0+byI50zEnQ/9Z5VOOnPRY/XrFGHH0H vPYsk9cACG+qAhppUdNVoqXISQ13mFZOs45p7kXdEdcZw4GMNzDqHCPkmvcjkSuJ cjNQ3nzn9H2C4EMhlcu/euN7ByAgU2/Zvnn8qD57GT3gDohiSb2P8XpUI3PgvtoA D4Y+18xItdBe8tBLRK6qdkqFLo6f550hHcYaSG14Sqn+SFPPm3Eh/zcr9yDLvR9g VbSIjnTrhrwSk44StWwSmY4fI1p0SO4ujlCVsAvZqG/77+Ye+Fk5PcOWUz7zkHUq xlEu85A1BRuUomZuDjgiYlRPh+5UQcG2eyaKJfWAKHK83pey905sTavliqnbACQm TEPFIIEf23H+CVn+xIP7HPo3bPd8Vkf1rHSXllpHVPIsNto+P+C+Hvf4cmGjeXmY gG5SeHR86zs= =Mn2P -----END PGP SIGNATURE-----