CVE-2020-12887 (GCVE-0-2020-12887)
Vulnerability from cvelistv5
Published
2020-06-18 18:24
Modified
2024-08-04 12:11
Severity ?
CWE
  • n/a
Summary
Memory leaks were discovered in the CoAP library in Arm Mbed OS 5.15.3 when using the Arm mbed-coap library 5.1.5. The CoAP parser is responsible for parsing received CoAP packets. The function sn_coap_parser_options_parse() parses the CoAP option number field of all options present in the input packet. Each option number is calculated as a sum of the previous option number and a delta of the current option. The delta and the previous option number are expressed as unsigned 16-bit integers. Due to lack of overflow detection, it is possible to craft a packet that wraps the option number around and results in the same option number being processed again in a single packet. Certain options allocate memory by calling a memory allocation function. In the cases of COAP_OPTION_URI_QUERY, COAP_OPTION_URI_PATH, COAP_OPTION_LOCATION_QUERY, and COAP_OPTION_ETAG, there is no check on whether memory has already been allocated, which in conjunction with the option number integer overflow may lead to multiple assignments of allocated memory to a single pointer. This has been demonstrated to lead to memory leak by buffer orphaning. As a result, the memory is never freed.
References
cve@mitre.orghttps://github.com/ARMmbed/mbed-coap/pull/116Third Party Advisory
cve@mitre.orghttps://github.com/ARMmbed/mbed-os/issues/12930Third Party Advisory
cve@mitre.orghttps://github.com/ARMmbed/mbed-os/issues/12957Third Party Advisory
cve@mitre.orghttps://github.com/mjurczak/mbed-coap/commit/4647a68e364401e81dbd370728127d844f221d93Patch, Third 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/12930Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/ARMmbed/mbed-os/issues/12957Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/mjurczak/mbed-coap/commit/4647a68e364401e81dbd370728127d844f221d93Patch, Third Party Advisory
Impacted products
Vendor Product Version
n/a n/a Version: n/a
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