PoC Index

CVE-2020-24722

MEDIUM 5.9EPSS 2.5%

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.

CVSS v3.1
5.9 MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
CVSS v2.0
2.6 LOWAV:N/AC:H/Au:N/C:N/I:P/A:N
EPSS
2.46% chance of exploitation in the next 30 days, 83th percentile
Published
2020-10-07
Updated
2024-08-04

Proof-of-concept exploits (1)

References

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