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This section focuses on three different examples of abusing legitimate functionality First a background on WAP Push messages is discussed, followed by an example attack Next, MMS Notification functionality and attacks are discussed Finally, an example OTA Settings attack is covered
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For a multitude of reasons, mobile carriers require the ability to interact with the mobile phones on their network in an administrative fashion A WAP Push SMS message is one such mechanism carriers employ to achieve this goal A WAP Push message is designed to allow an authorized party such as a user s carrier to push content to a user s cell phone This allows carriers to initiate a connection to the cell phone in order to provide updates or services to the customers Although WAP Push functionality can communicate over UDP port 2049 on phones that support it, SMS is used as the primary delivery mechanism Once it is delivered over SMS, the content contained inside a WAP Push message requires little if any user interaction, depending on message type and options The messages are meant not to interrupt the user by mostly operating in the background, as exemplified by the different types of WAP Push messages available The three types of WAP Push messages available are SI (Service Indication), SL (Service Loading), and CO (Cache Operations) Both SI and SL types deliver a URI to the phone pointing to content The CO type invalidates objects created by SI or SL messages This section provides the necessary background information on these three types so that SMS attacks involving WAP Push messages can be discussed Service Indication messages are used to inform the user that a service is available The user can choose to act on the information by starting the service or postponing it
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The service is pointed to by the URI included in the SI message The message can also include a description of the service in order to give the user more contextual information on whether or not they d be interested in the message Typical services can be stock quotes, e-mail notification, and advertising The key concept is that this message type requires user notification and interaction Service Indication messages are created in XML and then compiled to the WAP Binary XML (WBXML) binary format, as defined by the WAP Forum (see www openmobileallianceorg/tech/affiliates/LicenseAgreementasp DocName=/wap/ wap-167-serviceind-20010731-apdf doc=wap-167-serviceind-20010731-apdf) The following is a sample Service Indicator message:
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< xml version="10" > <!DOCTYPE si PUBLIC -//WAPFORUM//DTD SI 10//EN http://wwwwapforumorg/DTD/sidtd > <si> <indication href="http://examplecom" si-id="1234" action="signal-medium" > Message Text </indication> </si>
The various attributes in this message are explained in the following list: href This is a Uniform Resource Identifier (URI) to the service si-id This an ID for the message, represented as a string value If it is omitted, the ID will be set to the href value action This defines the action taken by the phone The first three present information to the user and vary in urgency The possible actions are: signal-low signal-medium signal-high signal-none delete There are also attributes related to message creation and expiry times Service Loading messages, as the name implies, load a service and have the option of doing so without any user interaction These messages were designed for carriers to be able to force the user to execute a service In contrast to SI messages,
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SL messages only have two attributes The following is a sample Service Load message:
< xml version="10" > <!DOCTYPE sl PUBLIC -//WAPFORUM//DTD SL 10//EN http://wwwwapforumorg/DTD/sldtd > <sl href="http://examplecom" action="execute-low" ></sl>
The various attributes in this message are explained in the following list: href As before, the href attribute defines the location of the service However, the action attribute has different options The action attribute defines the level of user interaction execute-low The specification states that this option must not be user intrusive In other words, the service is executed without informing the user execute-high The specification states that this option may be user intrusive The implementation can vary whether the user is informed or not cache The service is cached onto the phone It is not executed but rather just fetched The user is not informed that the service is loaded onto the phone The difference between SI and SL is apparent in their action names: signal versus execute As will be shown in the next section, the service-loading functionality is of far more use to attackers WAP Push CO messages invalidate objects in the cache CO messages are not covered because they only allow invalidating previously sent messages, which is not applicable to any attacks covered in this chapter Generally the same privileges are required to successfully send CO messages as well as SL and SI messages
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