CVE-2020-24722
Medium
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.
SeverityMedium
CVSS5.9
Exploit probability—
ProductExposure Notifications
PublishedOct 7, 2020
First seenOct 7, 2020
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| exposure_notifications_project exposure_notifications | v ≤ 2020-10-05 | — |
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