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A buffer over-read was discovered in the CoAP library in Arm Mbed OS 5.15.3. The CoAP parser is responsible for parsing received CoAP packets. The function sn_coap_parser_options_parse_multiple_options() parses CoAP options that may occur multiple consecutive times in a single packet. While processing the options, packet_data_pptr is accessed after being incremented by option_len without a prior out-of-bounds memory check. The temp_parsed_uri_query_ptr is validated for a correct range, but the range valid for temp_parsed_uri_query_ptr is derived from the amount of allocated heap memory, not the actual input size. Therefore the check of temp_parsed_uri_query_ptr may be insufficient for safe access to the area pointed to by packet_data_pptr. As a result, access to a memory area outside of the intended boundary of the packet buffer is made.

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ARM Mbed OS CoAP library 缓冲区错误漏洞

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。CoAP library是其中的一个约束应用协议（CoAP）库。 ARM Mbed OS 5.15.3版本中的CoAP library存在缓冲区错误漏洞。攻击者可利用该漏洞消耗所有可用资源，造成拒绝服务。

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