CVE-2020-12884 (GCVE-0-2020-12884)
Vulnerability from cvelistv5
Published
2020-06-18 18:24
Modified
2024-08-04 12:11
Severity ?
CWE
  • n/a
Summary
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
cve@mitre.orghttps://github.com/ARMmbed/mbed-coap/pull/116Third Party Advisory
cve@mitre.orghttps://github.com/ARMmbed/mbed-os/issues/12928Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/ARMmbed/mbed-coap/pull/116Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/ARMmbed/mbed-os/issues/12928Third Party Advisory
Impacted products
Vendor Product Version
n/a n/a Version: n/a
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