Earlier Doctor Web issued a report about a similar threat to Android devices.
Similarly to the Android issue, a solution to the iOS problem is quite simple: open the Settings applet, go to the Safari tab, select Delete cookie and data and press Clear in the pop-up window. In the same list select Clear History in order to prevent Safari from resuming the previously interrupted session. Besides, you can open a new Safari tab from any other application (e.g. choose to open an iTunes page), close the remaining tabs including the one blocked by the malicious script.
This method may not work with other browsers for iOS whose settings can only be accessed from the browser window instead of the Settings applet. If your browser doesn’t allow clearing its cache with tools other than its own interface, you may need to take other measures and possibly reinstall the browser. For more detailed information refer to documentation for the respective software.
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