IntelliShield has updated this alert to provide additional details regarding the Cisco Small Business SPA300 and SPA500 Series IP Phones unauthenticated remote dial vulnerability.
A vulnerability in the firmware of the Cisco Small Business SPA 300 and 500 series IP phones could allow an unauthenticated, remote attacker to listen to the audio stream of an IP phone.
The vulnerability is due to improper authentication settings in the default configuration. An attacker could exploit this vulnerability by sending a crafted XML request to the affected device. An exploit could allow the attacker to listen to a remote audio stream or make phone calls remotely.
Cisco has confirmed the vulnerability; however, software updates are not available.
At the time this alert was first published, Cisco Small Business SPA300 and SPA500 Series IP phones version 7.5.5 was vulnerable. Later versions of Cisco Small Business SPA300 and SPA500 Series IP phones may also be vulnerable.
To exploit this vulnerability, an attacker may need access to trusted, internal networks behind a firewall to send crafted XML requests to the targeted device. This access requirement may reduce the likelihood of a successful exploit.
Cisco would like to thank Chris Watts of Tech Analysis for reporting this vulnerability.
Cisco plans to release new software that addresses this vulnerability by April 10, 2015.
Cisco has released bug ID CSCuo52482 for registered users that contains additional details and an up-to-date list of affected product versions.
An unauthenticated, remote attacker could exploit this vulnerability to listen to a remote audio stream from an affected device or to gain access to make phone calls remotely. A successful exploit could be used to conduct further attacks.
The vulnerability is due to improper authentication settings in the default configuration of the affected software.
An unauthenticated, remote attacker could exploit this vulnerability by sending a crafted XML request to a targeted device. An exploit could allow the attacker to access sensitive information by listening to a remote audio stream sent from the device. In addition, the attacker could make phone calls remotely.
Administrators are advised to contact the vendor regarding future updates and releases.
Administrators are advised to enable XML Execution authentication in the configuration settings of affected devices.
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.
Software updates are not available.
Version 1, March 19, 2015, 5:04 PM: Cisco Small Business SPA 300 and 500 Series IP phones contain a vulnerability that could allow an unauthenticated, remote attacker to access sensitive information. Updates are not available.
The security vulnerability applies to the following combinations of products.
Cisco Small Business SPA500 Series IP Phones
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.