Old iPhones Remain Vulnerable to Bootloader Exploits Despite Airplane Mode for Crypto Seed Storage
Resetting an old iPhone, placing it in airplane mode, and using it to store a cryptocurrency wallet recovery phrase does not guarantee security, according to OneKey founder Ishi Wang. The warning highlights that physical access by an attacker renders airplane mode ineffective against known hardware vulnerabilities in older models.
The checkm8 exploit impacts devices from iPhone 4S to iPhone X, while the newer usbliter8 targets A12 and A13 chips found in iPhone XS, iPhone XR, the iPhone 11 family, and the second-generation iPhone SE. These flaws enable attackers to break the trusted boot chain and run arbitrary code prior to iOS startup. usbliter8 requires specialized USB hardware for exploitation.
Standard device resets fail to mitigate the issues because the vulnerable bootloader code cannot be rewritten via normal iOS updates. However, the device passcode, Secure Enclave, and wallet application encryption continue to provide protection layers. The overall risk depends on the device model, system version, presence of additional exploits, and password resilience.
Wang recommends treating disconnected older iPhones as insufficient for cold storage of recovery phrases. If a seed phrase has potentially been exposed, generating a new address within the same wallet will not resolve the problem; a fresh phrase and asset transfer are required.
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