CVE-2020-24722

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Summary

CVECVE-2020-24722
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2020-10-07 15:15:00 UTC
Updated2023-11-07 03:20:00 UTC
Description** DISPUTED ** 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."

Risk And Classification

Problem Types: CWE-294

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Exposure Notifications Project Exposure Notifications All All All All
Application Exposure Notifications Project Exposure Notifications All All All All

References

ReferenceSourceLinkTags
Full Disclosure: CVE-2020-24722: GAEN Protocol Metadata Deanonymization and Risk-score Inflation Issues MISC seclists.org Exploit, Mailing List, Third Party Advisory
exposure-notifications-internals/en-risks-and-mitigations-faq.md at main · google/exposure-notifications-internals · GitHub MISC github.com Third Party Advisory
GAEN Protocol Metadata Deanonymization / Risk-Score Inflation ≈ Packet Storm MISC packetstormsecurity.com Exploit, Third Party Advisory, VDB Entry
An update on Exposure Notifications MISC blog.google Third Party Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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