Mtk — Sec Bypass

| Component | Role | Security Mechanism | |-----------|------|---------------------| | | First-stage immutable code | eFuse-based secure boot (RSA-2048/SHA-256) | | Preloader | Second-stage loader | Signature verification of next stage (LK/TEE) | | TEE (TrustZone) | Secure world OS (Kinibi/Trustonic) | Secure storage, cryptographic ops | | Secure Boot | Chain of trust from ROM to kernel | Image signing via OEM keys | | DA (Download Agent) | Flash programming mode (Preloader/BROM) | Signed DA required; anti-rollback via eFuses |

: The preloader checks the signature of the Little Kernel (LK) bootloader using a stored public key. However, due to an integer overflow in the signature length field (or improper handling of malformed headers), the preloader may treat an unsigned image as valid. Mtk Sec Bypass

: BootROM does not allow arbitrary code execution over USB unless a signed DA is provided. However, logic flaws in the DA handshake or USB command parsers have proven fatal. 3. Attack Vectors & Deep Dive 3.1 BootROM USB Bypass (MTK Bypass Tool Family) CVE(s) : Various undisclosed / publicly known as “MTK Meta Mode bypass”, “BROM exploit” Affected chips : MT6735, MT6750, MT6761, MT6762, MT6765, MT6580, MT8163, MT8173, many pre-2020 chips. | Component | Role | Security Mechanism |