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An issue was discovered in MBed OS 6.16.0. During processing of HCI packets, the software dynamically determines the length of the packet data by reading 2 bytes from the packet data. A buffer is then allocated to contain the entire packet, the size of which is calculated as the length of the packet body determined earlier and the header length. If the allocate fails because the specified packet is too large, no exception handling occurs and hciTrSerialRxIncoming continues to write bytes into the 4-byte large temporary header buffer, leading to a buffer overflow. This can be leveraged into an arbitrary write by an attacker. It is possible to overwrite the pointer to the buffer that is supposed to receive the contents of the packet body but which couldn't be allocated. One can then overwrite the state variable used by the function to determine which step of the parsing process is currently being executed. This advances the function to the next state, where it proceeds to copy data to that arbitrary location. The packet body is then written wherever the corrupted data pointer is pointing.

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ARM Mbed OS 安全漏洞

ARM Mbed OS是英国ARM公司的一套专用于物联网的开源嵌入式操作系统。 ARM Mbed OS 6.16.0版本存在安全漏洞，该漏洞源于在处理HCI数据包时，若因数据包过大导致分配失败，且无异常处理，函数将继续向仅4字节的临时头部缓冲区写入数据，引发缓冲区溢出。

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