Samsung Galaxy Backdoor allows access and modify data Remotely. A Developer at Replicant OS  Paul Kocialkowski uncovered the backdoor, he claimed the backdoor is pre-installed on Samsung galaxy devices.  Currently the list of known affected devices includes the Galaxy S, Galaxy S II, Galaxy Note, Galaxy Tab 2, Galaxy S III, and Galaxy Note II, but it’s highly likely that many other Samsung devices are vulnerable.

“While working on Replicant, a fully free/libre version of Android, we discovered that the proprietary program running on the applications processor in charge of handling the communication protocol with the modem actually implements a backdoor that lets the modem perform remote file I/O operations on the file system. This program is shipped with the Samsung Galaxy devices and makes it possible for the modem to read, write, and delete files on the phone’s storage. On several phone models, this program runs with sufficient rights to access and modify the user’s personal data. A technical description of the issue, as well as the list of known affected devices is available at the Replicant wiki.” the researcher said.