A vulnerability was found in ARM Mbed OS 5.15.3. It has been declared as critical. This vulnerability affects the function sn_coap_parser_options_parse_multiple_options of the component CoAP Library. The manipulation with an unknown input leads to a out-of-bounds vulnerability. The CWE definition for the vulnerability is CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The weakness was disclosed 06/18/2020 (GitHub Repository). The advisory is available at github.com. This vulnerability was named CVE-2020-12884 since 05/15/2020. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The entries 156921, 156923, 156924 and 156925 are pretty similar.

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Vendor

• ARM

Name

• Mbed OS

Version

• 5.15.3

License

• commercial

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CPE 2.2info

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