CVE-2021-34146

The Bluetooth Classic implementation in the Cypress CYW920735Q60EVB does not properly handle the reception of continuous unsolicited LMP responses, allowing attackers in radio range to trigger a denial of service and restart (crash) of the device by flooding it with LMP_AU_Rand packets after the paging procedure.

CVSS v3 6.5 MEDIUM
CVSS v2.0 6.1 MEDIUM

6.5^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 3.6

Attack Vector ADJACENT_NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

6.1^/10

CVSS v2.0 : MEDIUM

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

Exploitability : 6.5 / Impact : 6.9

Access Vector ADJACENT_NETWORK

Access Complexity LOW

Authentication NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact COMPLETE

References

Link	Resource
https://dl.packetstormsecurity.net/papers/general/braktooth.pdf	Technical Description Third Party Advisory
https://www.cypress.com/documentation/datasheets/cyw20735b1-single-chip-bluetooth-transceiver-wireless-input-devices	Vendor Advisory

Configurations

Configuration 1 (hide)

AND

cpe:2.3:o:cypress:cyw920735q60evb-01_firmware:-:*:*:*:*:*:*:*

cpe:2.3:h:cypress:cyw920735q60evb-01:-:*:*:*:*:*:*:*

Configuration 2 (hide)

AND

cpe:2.3:o:cypress:cyw20735b1_firmware:-:*:*:*:*:*:*:*

cpe:2.3:h:cypress:cyw20735b1:-:*:*:*:*:*:*:*

History

No history.

Information

Published : 2021-09-07 07:15

Updated : 2024-02-28 18:28

NVD link : CVE-2021-34146

Mitre link : CVE-2021-34146

CVE.ORG link : CVE-2021-34146

JSON object : View

Products Affected

cypress

cyw920735q60evb-01_firmware
cyw20735b1
cyw920735q60evb-01
cyw20735b1_firmware

CWE

NVD-CWE-noinfo

{"id": "CVE-2021-34146", "metrics": {"cvssMetricV2": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"version": "2.0", "baseScore": 6.1, "accessVector": "ADJACENT_NETWORK", "vectorString": "AV:A/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": "MEDIUM", "obtainAllPrivilege": false, "exploitabilityScore": 6.5, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.5, "attackVector": "ADJACENT_NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:A/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": 2.8}]}, "published": "2021-09-07T07:15:07.327", "references": [{"url": "https://dl.packetstormsecurity.net/papers/general/braktooth.pdf", "tags": ["Technical Description", "Third Party Advisory"], "source": "cve@mitre.org"}, {"url": "https://www.cypress.com/documentation/datasheets/cyw20735b1-single-chip-bluetooth-transceiver-wireless-input-devices", "tags": ["Vendor Advisory"], "source": "cve@mitre.org"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "NVD-CWE-noinfo"}]}], "descriptions": [{"lang": "en", "value": "The Bluetooth Classic implementation in the Cypress CYW920735Q60EVB does not properly handle the reception of continuous unsolicited LMP responses, allowing attackers in radio range to trigger a denial of service and restart (crash) of the device by flooding it with LMP_AU_Rand packets after the paging procedure."}, {"lang": "es", "value": "Una implementaci\u00f3n de Bluetooth Classic en el Cypress CYW920735Q60EVB no maneja apropiadamente la recepci\u00f3n de respuestas LMP continuas no solicitadas, permitiendo a atacantes en el rango de radio desencadenar una denegaci\u00f3n de servicio y reinicio (crash) del dispositivo al inundarlo con paquetes LMP_AU_Rand despu\u00e9s del procedimiento de paginaci\u00f3n"}], "lastModified": "2021-09-14T14:56:38.277", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:cypress:cyw920735q60evb-01_firmware:-:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F7346686-15A9-48E0-A585-208284B94033"}], "operator": "OR"}, {"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:h:cypress:cyw920735q60evb-01:-:*:*:*:*:*:*:*", "vulnerable": false, "matchCriteriaId": "E0F717A9-CCE1-4D1A-9726-48BB0A13BE57"}], "operator": "OR"}], "operator": "AND"}, {"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:cypress:cyw20735b1_firmware:-:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "15A97D16-7D02-4170-AB33-60E5A44F2CB0"}], "operator": "OR"}, {"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:h:cypress:cyw20735b1:-:*:*:*:*:*:*:*", "vulnerable": false, "matchCriteriaId": "F6EBADCA-0C07-4AA0-827D-881CD6FEBE49"}], "operator": "OR"}], "operator": "AND"}], "sourceIdentifier": "cve@mitre.org"}