According to leaked documents, the NSA claims a 100 percent success rate when it comes to implanting iOS devices with spyware. The documents suggest that the NSA needs physical access to a device to install the spyware—something the agency has achieved by rerouting shipments of devices purchased online—but a remote version of the exploit is also in the works.
UPDATE: Steve Wildstrom reports:
If you dig back through the sources here, you find a fascinating dump of documents in Der Spiegel (German original) about the NSA’s Tailored Access Operations including a 50-page catalog of snooping devices worthy of MI-6′s fictional Q. One, called DROPOUTJEEP, claimed the ability to compromise an iPhone by replacing altering its built-in software. “The initial release of DROPOUTJEEP will focus on installing the implant via close access methods,” the 2008 document said. “A remote capability will be pursued in a future release.” In other words, before any snooping took place, the NSA first needed to get its hands on your iPhone and replace its software1 .