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CMD_OEM_UNLOCK (type 0x81, length 0x04, value 0x5A5A5A5A) If bootloader verification is weak (common in MediaTek MT6789 and Dimensity 9000 series), the unlock flag in secro partition is flipped. | Impact Area | Severity | Android 13 Example | |-------------|----------|--------------------| | Confidentiality | High | Full filesystem extraction without authentication | | Integrity | High | Disable dm-verity, modify system partition | | Availability | Medium | Wipe FRP, brick device via corrupting persist | | Authentication | Critical | Bypass lockscreen, enroll new fingerprint |
0x10 0x04 0x00 0x00 0x40 0x00 0xC0 0x00 TXD uses a known loophole: The diag device context in some Android 13 kernels (especially pre-June 2025 patches) allows ioctl commands DIAG_SET_DCI and DIAG_GET_DELAYED_RSP from untrusted apps via adb shell . TXD abuses this to elevate from shell UID to system UID, then to root via setns() on vold netns. 4.5 Bootloader Unlock Flow On supported chipsets, TXD sends: txd tool android 13
| Type (1 byte) | Length (2 bytes) | Value (variable) | |---------------|------------------|-------------------| CMD_OEM_UNLOCK (type 0x81, length 0x04, value 0x5A5A5A5A) If
AT+DIAG=1 If blocked, TXD falls back to sending raw USB_DEVICE_REQ_SET_FEATURE to enable test mode. Each TXD command is a TLV (Type-Length-Value): CMD_OEM_UNLOCK (type 0x81