java barcode reader free 8: WebOS Security in Android

Make Data Matrix ECC200 in Android 8: WebOS Security

8: WebOS Security
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reviewed for locations where unescaped and potentially malicious user data is formatted into templates This is a time-consuming and expensive process, especially when compared to the cost of writing proper templates Instead of globally disabling HTML escaping, instruct the framework to disable it on a token-by-token basis Do this by placing a hyphen (-) at the beginning of the replacement tokens The framework will skip HTML-escaping these elements Here s an updated version of the preceding team_name div The #{team_name} replacement token will not be escaped
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<div class="team_name">Team Name: #{-team_name}</p>
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Use this behavior sparingly If an element is excluded from HTML escaping, ensure that models used for formatting do not contain any unescaped user data
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The Prototype JavaScript framework, included with WebOS, has its own template functionality that is very similar to standard WebOS view templates However, these templates are not governed by the escapeHTMLInTemplates property Therefore, any data formatted into Prototype templates must be manually escaped For example, the following template-formatting routine is vulnerable to script injection when user_data contains malicious data:
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var score_template = new Template( <b> #{new_score} </b> ); sports_score = score_templateevaluate({ new_score : user_data}); thiscontrollerupdate($( SportsScores ), sports_score);
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To make this function safe, manually escape the data using Prototype s escapeHTML() function
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Data from web pages, e-mails, and text messages is obviously malicious, but an additional, and often forgotten about, attack surface is the local one With the rise of mobile malware, it is highly likely that users will install a malicious application at one point or another WebOS makes some attempts to protect applications from each other: Sensitive data, such as e-mails and SMS messages, is directly accessible only through the private bus, and each application is able to store private data using either the cookie or depot storage API Therefore, in order for mobile malware to compromise another application s data, the malware must find a way to inject script into the target application
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Mobile Application Security
Unfortunately, there are several ways this may happen, and they are not all well documented This section outlines the various vectors available to malware attempting to inject script
Application Launch Parameter Script Injection
One method attackers may use to inject script is by providing parameters containing script values These parameters will be passed to the StageAssistant and/or AppAssistant when the application starts The system provides no guarantees about the quality of this data, and parameter data certainly cannot be trusted To launch another application, applications dispatch a launch service request to the ApplicationManager service Here s an example:
thiscontrollerserviceRequest( palm://compalmapplicationManager , { method : launch , parameters : { id : comisecpartnersmovietimes , params : { movie_title : Indiana Jones , server_url: http://wwwisecpartnerscom/movies } } });
All applications are permitted to launch any other installed application and supply any parameter values they wish Applications need to handle potentially malicious launch parameters If the launched application doesn t handle the data appropriately perhaps by improper use of templates or the update method the malware could inject JavaScript that will execute in the context of the target application There are legitimate uses for launch parameters For example, a movie application may take a movie_title parameter that it uses to search the Internet for movie show times Because malware may have caused the application launch, the movie application must be careful about how it treats the movie_title data Otherwise, formatting the search query into a template or evaluating it as JSON will likely result in script injection Script injection is not the only concern; malicious values may be supplied to exploit the application s business logic For example, our movie application could take a server_url parameter that tells the application which server to run the search query against Assume that along with this search request, the application sends an authentication token Obviously, an attacker would like to gain access to this token
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