CVE-2020-12885

An infinite loop 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 in a while loop. This loop's exit condition is computed using the previously allocated heap memory required for storing the result of parsing multiple options. If the input heap memory calculation results in zero bytes, the loop exit condition is never met and the loop is not terminated. As a result, the packet parsing function never exits, leading to resource consumption.

CVSS v3 7.5 HIGH
CVSS v2.0 7.8 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

7.8^/10

CVSS v2.0 : HIGH

Vector : AV:N/AC:L/Au:N/C:N/I:N/A:C

Exploitability : 10.0 / Impact : 6.9

Access Vector NETWORK

Access Complexity LOW

Authentication NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact COMPLETE

References

Link	Resource
https://github.com/ARMmbed/mbed-coap/pull/116	Third Party Advisory
https://github.com/ARMmbed/mbed-os/issues/12929	Third Party Advisory

Configurations

Configuration 1 (hide)

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

History

No history.

Information

Published : 2020-06-18 19:15

Updated : 2023-12-10 13:27

NVD link : CVE-2020-12885

Mitre link : CVE-2020-12885

CVE.ORG link : CVE-2020-12885

JSON object : View

Products Affected

arm

mbed_os

CWE

CWE-835

Loop with Unreachable Exit Condition ('Infinite Loop')

{"id": "CVE-2020-12885", "metrics": {"cvssMetricV2": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"version": "2.0", "baseScore": 7.8, "accessVector": "NETWORK", "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:C", "authentication": "NONE", "integrityImpact": "NONE", "accessComplexity": "LOW", "availabilityImpact": "COMPLETE", "confidentialityImpact": "NONE"}, "acInsufInfo": false, "impactScore": 6.9, "baseSeverity": "HIGH", "obtainAllPrivilege": false, "exploitabilityScore": 10.0, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 3.9}]}, "published": "2020-06-18T19:15:10.050", "references": [{"url": "https://github.com/ARMmbed/mbed-coap/pull/116", "tags": ["Third Party Advisory"], "source": "cve@mitre.org"}, {"url": "https://github.com/ARMmbed/mbed-os/issues/12929", "tags": ["Third Party Advisory"], "source": "cve@mitre.org"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-835"}]}], "descriptions": [{"lang": "en", "value": "An infinite loop 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 in a while loop. This loop's exit condition is computed using the previously allocated heap memory required for storing the result of parsing multiple options. If the input heap memory calculation results in zero bytes, the loop exit condition is never met and the loop is not terminated. As a result, the packet parsing function never exits, leading to resource consumption."}, {"lang": "es", "value": "Se detect\u00f3 un bucle infinito en la biblioteca CoAP en Arm Mbed OS versi\u00f3n 5.15.3. El analizador CoAP es responsable de analizar los paquetes CoAP recibidos. La funci\u00f3n sn_coap_parser_options_parse_multiple_options() analiza las opciones de CoAP en un bucle while. La condici\u00f3n de salida de este bucle se calcula usando la memoria de la pila asignada previamente requerida para almacenar el resultado de analizar m\u00faltiples opciones. Si el c\u00e1lculo de la memoria de la pila de entrada resulta en cero bytes, la condici\u00f3n de salida del bucle nunca se cumple y el bucle no es finalizado. Como resultado, la funci\u00f3n de an\u00e1lisis de paquetes nunca se cierra, conllevando al consumo de recursos"}], "lastModified": "2020-06-25T14:35:22.533", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:arm:mbed_os:5.15.3:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "B314FCEF-12B7-4510-AC5E-12D3574E3E68"}], "operator": "OR"}]}], "sourceIdentifier": "cve@mitre.org"}