CVE-2024-48981

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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 header by looking up the identifying first byte and matching it against a table of possible lengths. The initial parsing function, hciTrSerialRxIncoming does not drop packets with invalid identifiers but also does not set a safe default for the length of unknown packets' headers, leading to a buffer overflow. This can be leveraged into an arbitrary write by an attacker. It is possible to overwrite the pointer to a not-yet-allocated buffer that is supposed to receive the contents of the packet body. One can then overwrite the state variable used by the function to determine which state of packet parsing is currently occurring. Because the buffer is allocated when the last byte of the header has been copied, the combination of having a bad header length variable that will never match the counter variable and being able to overwrite the state variable with the resulting buffer overflow can be used to advance the function to the next step while skipping the buffer allocation and resulting pointer write. The next 16 bytes from the packet body are 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，软件动态确定数据包头部长度的方式存在缺陷，导致未对无效标识符的数据包进行丢弃，也没有为未知数据包头部设置安全默认长度，从而引起缓冲区溢出。

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