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An issue was discovered in MBed OS 6.16.0. When parsing hci reports, the hci parsing software dynamically determines the length of a list of reports by reading a byte from an input stream. It then fetches the length of the first report, uses it to calculate the beginning of the second report, etc. In doing this, it tracks the largest report so it can later allocate a buffer that fits every individual report (but only one at a time). It does not, however, validate that these addresses are all contained within the buffer passed to hciEvtProcessLeExtAdvReport. It is then possible, though unlikely, that the buffer designated to hold the reports is allocated in such a way that one of these out-of-bounds length fields is contained within the new buffer. When the (n-1)th report is copied, it overwrites the length field of the nth report. This now corrupted length field is then used for a memcpy into the new buffer, which may lead to a buffer overflow.

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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，该漏洞源于解析HCI报告时，软件未验证报告地址是否位于hciEvtProcessLeExtAdvReport缓冲区内，可能导致缓冲区溢出。

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