Software Engineering Institute

The BlackBerry Router is a component of the BlackBerry Enterprise Server (BES). The BlackBerry Router manages connections and routes data between between BES servers, BlackBerry Infrastructure, BlackBerry Handhelds, and other BlackBerry client devices. A vulnerability in the way the BlackBerry Router could allow an attacker using specially crafted SRP packets to cause a denial of service. If the router stops functioning, BlackBerry communication will be disrupted.

The BlackBerry Router uses SRP to make an outbound connection to the BlackBerry Infrastructure on port 3101/tcp. In order to exploit this vulnerability, a remote attacker would need to subvert DNS or otherwise impersonate the BlackBerry Infrastructure or intercept the TCP connection. An attacker with access to the network containing the BlackBerry Router may be able to initiate TCP connections to the router to exploit the vulnerability.

By establishing a TCP connection with a BlackBerry Router, an unauthenticated, remote attacker could cause a denial of service, disrupting communication between BES components and BlackBerry Handheld devices.

RIM Technical Knowledge Center article KB-04758 states that "This is a previously reported issue that has been escalated internally to our development team. No resolution time frame is currently available."

Deploy BlackBerry Routers and BES servers according to best practices, including restricting access to BlackBerry components using firewalls. Static DNS entries for BlackBerry Infrastructure hosts can help mitigate the risks of an attacker subverting DNS to impersonate the BlackBerry Infrastructure. Please see RIM Technical Knowledge Center article KB-04758 for further information.