java barcode reader free 8: WebOS Security in Android

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8: WebOS Security
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By supplying their own value for the server_url parameter, the attacker may be able to force the application to post the attacker s malicious server This technique could be used to harvest a large number of authentication tokens Do not trust launch parameter values and, if possible, limit the set of allowed values to a predefined whitelist Avoid sending data, especially sensitive data, to launch parameter-specified server addresses If a request will leak sensitive data, consider asking the user before issuing the request To test an application s resistance to malicious launch parameters, start the application using the luna-send command-line tool This tool must be run from a WebOS command prompt and enables sending serviceRequests directly to services To use luna-send to launch an application, do the following:
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1 Open a novaterm shell to the device 2 Run the following command The terminal requires the additional backslashes
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luna-send -n 1 palm://compalmapplicationManager/launch {\ id\":\"comisecpartnershelloworld\", \"params\":\"{foo:\\\"bar\\\"}\"}"
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Directly Launching Scenes
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A slightly less well understood boundary is the scene boundary Quite simply, any application can push a scene from any other application onto its scene stack When this happens, the application that owns the scene is started and the execution context switches to the newly pushed scene This behavior is legitimately used throughout WebOS to elevate privileges and to provide a consistent user experience For example, applications are prohibited from using the Camera plug in directly, but they can push the capture scene from the Camera application onto their stack When they do so, the Camera scene runs and provides the user interface and permissions for taking the camera shot The Camera capture scene is an example of a scene that was designed to be included by other applications However, not all scenes are designed this way, and attackers may be able to abuse scenes by invoking them out of order or supplying malicious parameters Vulnerabilities resulting from the direct instantiation of scenes are similar to application launch vulnerabilities Applications can invoke a scene directly using the MojoControllerStageControllerpushScene(scene, args) method, as shown here:
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thiscontrollerstageControllerpushScene( { appId: comisecpartnersmovie_app , name: PurchaseScene }, { tickets: 2"});
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The second (args) parameter to the pushScene() method is an object that will be passed to the PurchaseScene s scene assistant Just like parameters passed on application launch, scene parameters must not be trusted Also be aware that your scene may be called out of order Imagine the following scenario:
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1 A movie application allows you to look up nearby movie times and purchase
tickets To ease the purchase process, the movie application stores your account information
2 When you make the purchase, the application takes you through a three-step
process: Search Movies, Select Theater and Time, and Purchase
3 The Purchase scene takes a movie ticket ID and the e-mail address to send the
tickets to as scene parameters
4 When the Purchase scene starts, it performs the purchase automatically and
then shows the results to the user Malware can abuse this process by skipping the first two scenes and directly invoking the Purchase scene Because the application didn t verify the e-mail address parameter, the tickets are sent to the attacker s e-mail address instead of to the legitimate user The process may sound contrived, but vulnerabilities extremely similar to this have been found in several WebOS applications Unfortunately, being vigilant is the only solution Always design scenes so that they are resistant to malicious parameters and do not execute sensitive actions without first asking the user for confirmation
Opening Documents and Service Requests
Two additional methods for launching applications and communicating between applications involve using the Application Manager s open method and directly making a serviceRequest In the current version of the SDK, third-party applications are unable to register to be launched using either of these methods If third-party services or document handling are ever allowed, though, risks similar to those outlined in the previous two sections will likely apply
Application Packaging
Applications are packaged using the Itsy Package Manager System (ipkg) This is a commonly used application distribution format for embedded devices, and it bundles the entire application into a single easy-to-distribute file The package files have the
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