Description
An improper access control vulnerability exists in Semtech LoRa LR11xxx transceivers running early versions of firmware where the memory write command accessible via the physical SPI interface fails to enforce write protection on the program call stack. An attacker with physical access to the SPI interface can overwrite stack memory to hijack program control flow and achieve limited arbitrary code execution. However, the impact is limited to the active attack session: the device's secure boot mechanism prevents persistent firmware modification, the crypto engine isolates cryptographic keys from direct firmware access, and all modifications are lost upon device reboot or loss of physical access.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Semtech LR1110
Default version status: unaffected
0 to < TRX FW 0x0402affected
Semtech LR1120
Default version status: unaffected
0 to < TRX FW 0x0202affected
Semtech LR1121
Default version status: unaffected
0 to < TRX FW 0x0104affected