FKIE_CVE-2020-24722
Vulnerability from fkie_nvd - Published: 2020-10-07 15:15 - Updated: 2026-06-17 03:06
Severity
Summary
An issue was discovered in the GAEN (aka Google/Apple Exposure Notifications) protocol through 2020-10-05, as used in COVID-19 applications on Android and iOS. The encrypted metadata block with a TX value lacks a checksum, allowing bitflipping to amplify a contamination attack. This can cause metadata deanonymization and risk-score inflation. NOTE: the vendor's position is "We do not believe that TX power authentication would be a useful defense against relay attacks.
References
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| exposure_notifications_project | exposure_notifications | * | |
| exposure_notifications_project | exposure_notifications | * |
{
"affected": [
{
"affectedData": [
{
"product": "n/a",
"vendor": "n/a",
"versions": [
{
"status": "affected",
"version": "n/a"
}
]
}
],
"source": "cve@mitre.org"
}
],
"configurations": [
{
"nodes": [
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"cpeMatch": [
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"criteria": "cpe:2.3:a:exposure_notifications_project:exposure_notifications:*:*:*:*:*:android:*:*",
"matchCriteriaId": "59CFB73A-D00F-4527-BC13-DA45DE5F7175",
"versionEndIncluding": "2020-10-05",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:exposure_notifications_project:exposure_notifications:*:*:*:*:*:iphone_os:*:*",
"matchCriteriaId": "232A4EE9-1F2B-4672-BEA7-1663E87F6A0B",
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"cveTags": [
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"sourceIdentifier": "cve@mitre.org",
"tags": [
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"descriptions": [
{
"lang": "en",
"value": "An issue was discovered in the GAEN (aka Google/Apple Exposure Notifications) protocol through 2020-10-05, as used in COVID-19 applications on Android and iOS. The encrypted metadata block with a TX value lacks a checksum, allowing bitflipping to amplify a contamination attack. This can cause metadata deanonymization and risk-score inflation. NOTE: the vendor\u0027s position is \"We do not believe that TX power authentication would be a useful defense against relay attacks."
},
{
"lang": "es",
"value": "**EN DISPUTA** Se detect\u00f3 un problema en el protocolo GAEN (tambi\u00e9n se conoce como Google/Apple Exposure Notifications) hasta el 05/10/2020, tal como es usado en las aplicaciones COVID-19 en Android e iOS.\u0026#xa0;El bloque de metadatos cifrados con un valor TX carece de un checksum, permitiendo a bitflipping amplificar un ataque de contaminaci\u00f3n.\u0026#xa0;Esto puede causar una desanonimizaci\u00f3n de los metadatos y la inflaci\u00f3n de la puntuaci\u00f3n de riesgo.\u0026#xa0;NOTA: la posici\u00f3n del proveedor es \"No creemos que la autenticaci\u00f3n de energ\u00eda TX sea una defensa \u00fatil contra los ataques de retransmisi\u00f3n\""
}
],
"id": "CVE-2020-24722",
"lastModified": "2026-06-17T03:06:02.220",
"metrics": {
"cvssMetricV2": [
{
"acInsufInfo": false,
"baseSeverity": "LOW",
"cvssData": {
"accessComplexity": "HIGH",
"accessVector": "NETWORK",
"authentication": "NONE",
"availabilityImpact": "NONE",
"baseScore": 2.6,
"confidentialityImpact": "NONE",
"integrityImpact": "PARTIAL",
"vectorString": "AV:N/AC:H/Au:N/C:N/I:P/A:N",
"version": "2.0"
},
"exploitabilityScore": 4.9,
"impactScore": 2.9,
"obtainAllPrivilege": false,
"obtainOtherPrivilege": false,
"obtainUserPrivilege": false,
"source": "nvd@nist.gov",
"type": "Primary",
"userInteractionRequired": false
}
],
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 5.9,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
"version": "3.1"
},
"exploitabilityScore": 2.2,
"impactScore": 3.6,
"source": "nvd@nist.gov",
"type": "Primary"
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},
"published": "2020-10-07T15:15:12.553",
"references": [
{
"source": "cve@mitre.org",
"tags": [
"Exploit",
"Third Party Advisory",
"VDB Entry"
],
"url": "http://packetstormsecurity.com/files/159496/GAEN-Protocol-Metadata-Deanonymization-Risk-Score-Inflation.html"
},
{
"source": "cve@mitre.org",
"tags": [
"Exploit",
"Mailing List",
"Third Party Advisory"
],
"url": "http://seclists.org/fulldisclosure/2020/Oct/12"
},
{
"source": "cve@mitre.org",
"tags": [
"Third Party Advisory"
],
"url": "https://blog.google/inside-google/company-announcements/update-exposure-notifications"
},
{
"source": "cve@mitre.org",
"tags": [
"Third Party Advisory"
],
"url": "https://github.com/google/exposure-notifications-internals/blob/main/en-risks-and-mitigations-faq.md#additional-considerations"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
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"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
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"url": "http://seclists.org/fulldisclosure/2020/Oct/12"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
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"url": "https://blog.google/inside-google/company-announcements/update-exposure-notifications"
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{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
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"url": "https://github.com/google/exposure-notifications-internals/blob/main/en-risks-and-mitigations-faq.md#additional-considerations"
}
],
"sourceIdentifier": "cve@mitre.org",
"vulnStatus": "Modified",
"weaknesses": [
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"description": [
{
"lang": "en",
"value": "CWE-294"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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