Cisco IOS Software contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition or execute arbitrary code. Updates are available.
Cisco IOS Software contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition or execute arbitrary code.
The vulnerability is due to a lack of bounds checking in the Extension Mobility feature of the Cisco Unified Communications Manager Express (CME) component. An unauthenticated, remote attacker could exploit this vulnerability by making a crafted request to the login service for the Extension Mobility feature. Such a request could trigger a buffer overflow that could either cause a DoS condition on the affected system or allow the attacker to execute arbitrary code with elevated privileges.
Cisco has confirmed this vulnerability and released software updates.
Cisco has published a list of affected Cisco IOS Software releases in the security advisory. The Vendor Announcements section of this alert contains a link to the advisory.
Only devices that are configured to use Cisco Unified CME with the Extension Mobility feature are affected by this vulnerability.
Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available.
An unauthenticated, remote attacker could exploit this vulnerability to cause a DoS condition or execute arbitrary code with elevated privileges. If the attacker is able to execute arbitrary code, the result could be a complete system compromise.
The vulnerability is in the login service of the Extension Mobility feature of the Cisco Unified CME component. Only an attacker with a registered phone IP address may exploit this vulnerability. However, if auto registration is enabled, an attacker could use this feature to automatically register a phone IP address. After this has been done, the attacker could exploit this vulnerability by making crafted HTTP requests to the login service of the Extension Mobility feature that could trigger a buffer overflow. When the buffer overflow is triggered, the attacker could either cause a DoS condition on the affected device or execute arbitrary code with elevated privileges. The auto registration feature is enabled by default.
Administrators are advised to apply the appropriate updates.
Administrators may consider disabling the Extension Mobility feature to mitigate this vulnerability.
Administrators may consider disabling the auto-registration feature to make it more difficult for an attacker to exploit this vulnerability.
The Cisco Applied Intelligence team has created the following companion document to guide administrators in identifying and mitigating attempts to exploit this vulnerability prior to applying updated software: cisco-amb-20090923-cme
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 e-mail at firstname.lastname@example.org.
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.
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.