{"id":"CVE-2020-12887","state":"PUBLISHED","title":"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.","description":"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.","publishedAt":"2020-06-18T18:24:47.000Z","updatedAt":"2024-08-04T12:11:18.832Z","severity":null,"assigner":"mitre","products":["n/a n/a"],"affected":[{"vendor":"n/a","product":"n/a","versions":[{"version":"n/a","status":"affected"}]}],"references":["https://github.com/ARMmbed/mbed-os/issues/12957","https://github.com/ARMmbed/mbed-os/issues/12930","https://github.com/mjurczak/mbed-coap/commit/4647a68e364401e81dbd370728127d844f221d93","https://github.com/ARMmbed/mbed-coap/pull/116"],"weaknesses":[],"ingestedAt":"2026-10-29T19:46:27.697Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2020/12xxx/CVE-2020-12887.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2020-12887","state":"PUBLISHED","datePublished":"2020-06-18T18:24:47.000Z","dateUpdated":"2024-08-04T12:11:18.832Z","assignerShortName":"mitre","assignerOrgId":"8254265b-2729-46b6-b9e3-3dfca2d5bfca","dateReserved":"2020-05-15T00:00:00.000Z"},"containers":{"cna":{"descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"n/a","product":"n/a","versions":[{"version":"n/a","status":"affected"}]}],"references":[{"url":"https://github.com/ARMmbed/mbed-os/issues/12957","tags":["x_refsource_MISC"]},{"url":"https://github.com/ARMmbed/mbed-os/issues/12930","tags":["x_refsource_MISC"]},{"url":"https://github.com/mjurczak/mbed-coap/commit/4647a68e364401e81dbd370728127d844f221d93","tags":["x_refsource_MISC"]},{"url":"https://github.com/ARMmbed/mbed-coap/pull/116","tags":["x_refsource_CONFIRM"]}],"problemTypes":[{"descriptions":[{"description":"n/a","lang":"en","type":"text"}]}],"providerMetadata":{"shortName":"mitre","dateUpdated":"2020-06-18T18:24:47.000Z","orgId":"8254265b-2729-46b6-b9e3-3dfca2d5bfca"},"x_legacyV4Record":{"CVE_data_meta":{"ASSIGNER":"cve@mitre.org","ID":"CVE-2020-12887","STATE":"PUBLIC"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"n/a","version":{"version_data":[{"version_value":"n/a"}]}}]},"vendor_name":"n/a"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"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."}]},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"n/a"}]}]},"references":{"reference_data":[{"name":"https://github.com/ARMmbed/mbed-os/issues/12957","refsource":"MISC","url":"https://github.com/ARMmbed/mbed-os/issues/12957"},{"name":"https://github.com/ARMmbed/mbed-os/issues/12930","refsource":"MISC","url":"https://github.com/ARMmbed/mbed-os/issues/12930"},{"name":"https://github.com/mjurczak/mbed-coap/commit/4647a68e364401e81dbd370728127d844f221d93","refsource":"MISC","url":"https://github.com/mjurczak/mbed-coap/commit/4647a68e364401e81dbd370728127d844f221d93"},{"name":"https://github.com/ARMmbed/mbed-coap/pull/116","refsource":"CONFIRM","url":"https://github.com/ARMmbed/mbed-coap/pull/116"}]}}},"adp":[{"title":"CVE Program Container","references":[{"url":"https://github.com/ARMmbed/mbed-os/issues/12957","tags":["x_refsource_MISC","x_transferred"]},{"url":"https://github.com/ARMmbed/mbed-os/issues/12930","tags":["x_refsource_MISC","x_transferred"]},{"url":"https://github.com/mjurczak/mbed-coap/commit/4647a68e364401e81dbd370728127d844f221d93","tags":["x_refsource_MISC","x_transferred"]},{"url":"https://github.com/ARMmbed/mbed-coap/pull/116","tags":["x_refsource_CONFIRM","x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-04T12:11:18.832Z"}}]}}}