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Isolating mobile applications into a sandbox provides many benefits, not only for security but also stability Mobile applications might be written by a large organization with a proper security SDL (software development life cycle) or they might be written by a few people in their spare time It is impossible to vet each different application before it lands on your mobile phone, so to keep the OS clean and safe, it is better to isolate the applications from each other than to assume they will play nice In addition to isolation, limiting the application s calls into the core OS is also important In general, the application should only have access to the core OS in controlled and required areas, not the entire OS by default For example, in Windows Vista, Internet Explorer (IE) calls to the operating system are very limited, unlike previous versions of IE and Windows XP In the old world, web applications could break out of IE and access the operating system for whatever purpose, which became a key attack vector for malware Under Vista and IE7 Protected Mode, access to the core operating system is very limited, with only access to certain directories deemed untrusted by the rest of the OS Overall, the primary goals of application sandboxing are to ensure one application is protected from another (for example, your PayPal application from the malware you just downloaded), to protect the underlying OS from the application (both for security and stability reasons), and to ensure one bad application is isolated from the good ones
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13: Enterprise Security on the Mobile OS
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Figure 13-1
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All mobile operating systems have implemented some form of application isolation, but in different forms The newer model of application sandboxing gives each application its own unique identity Any data, process, or permission associated with the application remains glued to the identity, reducing the amount of sharing across the core OS For example, the data, files, and folders assigned to a certain application identity would not have access to any data, file, and folders assigned to another application s identity (see Figure 13-1) The traditional model uses Normal and Privileged assignments, where certain applications have access to everything on the device, and Normal applications have access to the same entities on the device For example, this model would prevent Normal applications from accessing parts of the file system that are set aside for Privileged applications; however, all Normal applications would have access to the same set of files/folders on the device (see Figure 13-2)
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Figure 13-2
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The next two subsections provide a short summary of how the different mobile operating systems measure up in terms of application sandboxing (be sure to reference s 2 5 for the specific implementations) Also, much of this information comes from Chris Clark s research on mobile application security, presented at the RSA Conference (https://365rsaconferencecom/blogs/podcast_series_rsa_conference_2009/2009/03/31/ christopher-clark-and-301-mobile-application-security why-is-it-so-hard)
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Windows Mobile/BlackBerry OS
BlackBerry devices and Windows Mobile both use the traditional model for application sandboxing For example, Blackberry uses Normal and Untrusted roles, whereas Windows Mobile uses Normal, Privileged, and Blocked On Windows Mobile, Privileged applications have full access to the entire device and its data, processes, APIs, and file/folders, as well as write access to the entire registry Normal applications have access to only parts of the file system, but all the Normal applications have access to the same subset of the operating systems It should be noted although one Normal application can access the same part of the file system as another Normal application, it cannot directly read or write to the other application s process memory Blocked applications are basically null, where they are not allowed to run at all So how does an application become a Privileged application Through application signing, which is discussed in the Application Signing section On Windows Mobile, the certificate used to sign the application determines whether the application is running in Normal mode or Privileged mode If you want your application to run as Privileged instead of Normal, you have to go through a more detailed process from the service provider signing your applications
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