A new hardware hacking technique targeting NAND flash memory chips has emerged, allowing attackers to extract sensitive data and reverse engineer products at a surprisingly low cost.

This “chip-off” attack involves physically removing the NAND memory from a device’s circuit board to read and potentially modify its contents.

The attack, which can be performed for as little as 170.83 euros, poses significant security risks for a wide range of electronic devices that rely on NAND flash storage, including smartphones, tablets, and Internet of Things (IoT) devices.

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Guillaume Quéré have demonstrated that with basic tools and minimal expertise, attackers can gain unauthorized access to firmware and other critical data stored on these chips.

The chip-off attack involves several key steps:

Removing the NAND chip from the target device using a hot air rework station
Cleaning the chip and preparing it for reading
Using a compatible flash/EEPROM programmer to dump the chip’s contents
Analyzing the extracted firmware for vulnerabilities or sensitive information

Researchers found that the entire process can be completed in as little as 30 minutes, making it a potentially rapid and effective attack vector.

This low-cost attack method has serious implications for device manufacturers and users alike. By extracting firmware, attackers can:

Uncover hardcoded secrets and encryption keys.
Reverse engineer proprietary algorithms and software.
Identify and exploit software vulnerabilities.
Modify firmware to introduce malicious code or backdoors.

The ability to perform these attacks with relatively inexpensive equipment lowers the barrier to entry for potential hackers and increases the risk of widespread exploitation.

The success of chip-off attacks is partly due to inherent vulnerabilities in NAND flash memory design. Researchers have identified several weaknesses that can be exploited:

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Program Interference: Malicious programs can corrupt data in adjacent memory cells through a phenomenon called “Parasitic Capacitance Coupling”.

Read Disturb: Rapid, repeated read operations can induce errors that corrupt both written and unwritten data blocks.

Two-Step Programming Vulnerability: The method used to program multi-level cell (MLC) NAND flash exposes partially-programmed cells to increased risk of interference and data corruption.

These vulnerabilities not only facilitate data extraction but can also be exploited to reduce the lifespan of NAND chips, potentially forcing entire devices to be replaced.

To address these security concerns, experts recommend several approaches:

Implementing stronger encryption for data stored on NAND chips
Enhancing physical security measures to prevent easy access to device internals
Adopting more robust programming techniques for NAND flash to reduce vulnerabilities
Developing improved error correction and data integrity checking mechanisms

Additionally, some researchers propose “RAD hardening” techniques, such as internally buffering data being read and written to the NAND flash drive, which could help mitigate certain types of attacks.

As the cost and complexity of hardware attacks continue to decrease, it is crucial for device manufacturers to prioritize security at both the hardware and software levels.

Users should also be aware of these risks and take appropriate precautions to protect sensitive data stored on their devices.

The emergence of low-cost NAND chip-off attacks serves as a stark reminder of the evolving threat landscape in hardware security. As technology advances, so too must our approaches to safeguarding the integrity and confidentiality of digital information.

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