fkie_cve-2020-12887
Vulnerability from fkie_nvd
Published
2020-06-18 19:15
Modified
2024-11-21 05:00
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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
arm mbed-coap 5.1.5
arm mbed_os 5.15.3


To clipboard 

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      "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."
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      "value": "Se detectaron p\u00e9rdidas de la memoria en la biblioteca CoAP en Arm Mbed OS versi\u00f3n 5.15.3 cuando se usa la biblioteca Arm mbed-coap versi\u00f3n 5.1.5. El analizador CoAP es responsable de analizar los paquetes CoAP recibidos. La funci\u00f3n sn_coap_parser_options_parse() analiza el campo CoAP option number de todas las opciones presentes en el paquete de entrada. Cada n\u00famero de opci\u00f3n es calculado como una suma del n\u00famero de opci\u00f3n previo y un delta de la opci\u00f3n actual. El delta y el n\u00famero de opci\u00f3n anterior son expresados como enteros de 16 bits sin signo. Debido a la falta de detecci\u00f3n de desbordamiento, es posible crear un paquete que contenga el n\u00famero de opci\u00f3n y resulte en que el mismo n\u00famero de opci\u00f3n sea procesado nuevamente en un solo paquete. Determinadas opciones asignan memoria llamando a una funci\u00f3n de asignaci\u00f3n de memoria. En los casos de COAP_OPTION_URI_QUERY, COAP_OPTION_URI_PATH, COAP_OPTION_LOCATION_QUERY y COAP_OPTION_ETAG, no se comprueba si ya se ha asignado memoria, lo que en conjunto con el desbordamiento de enteros del n\u00famero de opci\u00f3n puede conllevar a m\u00faltiples asignaciones de memoria asignada a un \u00fanico puntero. Se ha demostrado que esto conlleva a una p\u00e9rdida de memoria mediante un hu\u00e9rfano de b\u00fafer. Como resultado, la memoria nunca es liberada"
    }
  ],
  "id": "CVE-2020-12887",
  "lastModified": "2024-11-21T05:00:29.737",
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          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "PARTIAL",
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