Overview
- Description
- 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.
- Source
- cve@mitre.org
- NVD status
- Modified
- CNA Tags
- disputed
Risk scores
CVSS 3.1
- Type
- Primary
- Base score
- 5.9
- Impact score
- 3.6
- Exploitability score
- 2.2
- Vector string
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
- Severity
- MEDIUM
CVSS 2.0
- Type
- Primary
- Base score
- 2.6
- Impact score
- 2.9
- Exploitability score
- 4.9
- Vector string
- AV:N/AC:H/Au:N/C:N/I:P/A:N
Weaknesses
- nvd@nist.gov
- CWE-294
Social media
- Hype score
- Not currently trending
Configurations
[
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:a:exposure_notifications_project:exposure_notifications:*:*:*:*:*:android:*:*",
"vulnerable": true,
"matchCriteriaId": "59CFB73A-D00F-4527-BC13-DA45DE5F7175",
"versionEndIncluding": "2020-10-05"
},
{
"criteria": "cpe:2.3:a:exposure_notifications_project:exposure_notifications:*:*:*:*:*:iphone_os:*:*",
"vulnerable": true,
"matchCriteriaId": "232A4EE9-1F2B-4672-BEA7-1663E87F6A0B",
"versionEndIncluding": "2020-10-05"
}
],
"operator": "OR"
}
]
}
]