Developers from the Replicant project (a free Android offshoot) have documented a serious software back-door in Samsung’s Android phones , which “provides remote access to the data stored on the device.” They believe it is “likely” that the backdoor could provide “over-the-air remote control” to “access the phone’s file system.” At issue is Samsung’s proprietary IPC protocol, used in its modems. This protocol implements a set of commands called “RFS commands.” The Replicant team says that it can’t find “any particular legitimacy nor relevant use-case” for adding these commands, but adds that “it is possible that these were added for legitimate purposes, without the intent of doing harm by providing a back-door. Nevertheless, the result is the same and it allows the modem to access the phone’s storage.” The Replicant site includes proof-of-concept sourcecode for a program that will access the file-system over the modem. Replicant has created a replacement for the relevant Samsung software that does not allow for back-door access. Samsung Galaxy devices running proprietary Android versions come with a back-door that provides remote access to the data stored on the device. In particular, the proprietary software that is in charge of handling the communications with the modem, using the Samsung IPC protocol, implements a class of requests known as RFS commands, that allows the modem to perform remote I/O operations on the phone’s storage. As the modem is running proprietary software, it is likely that it offers over-the-air remote control, that could then be used to issue the incriminated RFS messages and access the phone’s file system. …The incriminated RFS messages of the Samsung IPC protocol were not found to have any particular legitimacy nor relevant use-case. However, it is possible that these were added for legitimate purposes, without the intent of doing harm by providing a back-door. Nevertheless, the result is the same and it allows the modem to access the phone’s storage. However, some RFS messages of the Samsung IPC protocol are legitimate (IPC_RFS_NV_READ_ITEM and IPC_RFS_NV_WRITE_ITEM) as they target a very precise file, known as the modem’s NV data. There should be no particular security concern about these as both the proprietary implementation and its free software replacement strictly limit actions to that particular file. Samsung Galaxy Back-door
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Samsung Galaxy back-door allows for over-the-air filesystem access
Apple apparently has the power to decrypt iPhone storage in response to law-enforcement requests, though they won’t say how. Google can remotely “reset the password” for a phone for cops, too: Last year, leaked training materials prepared by the Sacramento sheriff’s office included a form that would require Apple to “assist law enforcement agents” with “bypassing the cell phone user’s passcode so that the agents may search the iPhone.” Google takes a more privacy-protective approach: it “resets the password and further provides the reset password to law enforcement,” the materials say, which has the side effect of notifying the user that his or her cell phone has been compromised. Ginger Colbrun, ATF’s public affairs chief, told CNET that “ATF cannot discuss specifics of ongoing investigations or litigation. ATF follows federal law and DOJ/department-wide policy on access to all communication devices.” …The ATF’s Maynard said in an affidavit for the Kentucky case that Apple “has the capabilities to bypass the security software” and “download the contents of the phone to an external memory device.” Chang, the Apple legal specialist, told him that “once the Apple analyst bypasses the passcode, the data will be downloaded onto a USB external drive” and delivered to the ATF. It’s not clear whether that means Apple has created a backdoor for police — which has been the topic of speculation in the past — whether the company has custom hardware that’s faster at decryption, or whether it simply is more skilled at using the same procedures available to the government. Apple declined to discuss its law enforcement policies when contacted this week by CNET. It’s not clear to me from the above whether Google “resetting the password” for Android devices merely bypasses the lock-screen or actually decrypts the mass storage on the phone if it has been encrypted. I also wonder if the “decryption” Apple undertakes relies on people habitually using short passwords for their phones — the alternative being a lot of screen-typing in order to place a call. Apple deluged by police demands to decrypt iPhones [Declan McCullagh/CNet] ( via /. )