CVE-2020-12884

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.
References
Configurations

Configuration 1

cpe:2.3:o:arm:mbed_os:5.15.3:*:*:*:*:*:*:*

Information

Published : 2020-06-18 07:15

Updated : 2020-06-25 02:41


NVD link : CVE-2020-12884

Mitre link : CVE-2020-12884

Products Affected
No products.
CWE
CWE-125

Out-of-bounds Read