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VULNERABILITIES

CVE-2020-24722 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:5.9 MEDIUMVector:CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
http://packetstormsecurity.com/files/159496/GAEN-Protocol-Metadata-Deanonymization-Risk-Score-Inflation.html CVEExploitThird Party AdvisoryVDB Entry
https://blog.google/inside-google/company-announcements/update-exposure-notifications CVEThird Party Advisory
http://seclists.org/fulldisclosure/2020/Oct/12 CVEExploitMailing ListThird Party Advisory
https://github.com/google/exposure-notifications-internals/blob/main/en-risks-and-mitigations-faq.md#additional-considerations CVEThird Party Advisory
http://packetstormsecurity.com/files/159496/GAEN-Protocol-Metadata-Deanonymization-Risk-Score-Inflation.html [email protected]ExploitThird Party AdvisoryVDB Entry

see all 8 references

Weakness Enumeration

CWE-IDCWE NameSource
CWE-294Authentication Bypass by Capture-replay[email protected]

Affected Products

ProductVersions
exposure notifications project exposure notifications
<= 2020-10-05

CPE

  • cpe:2.3:a:exposure_notifications_project:exposure_notifications:*:*:*:*:*:android:*:*
  • cpe:2.3:a:exposure_notifications_project:exposure_notifications:*:*:*:*:*:iphone_os:*:*

Remediation

  • No remediation found in references.

Change History

10 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2020-24722
NVD Published Date:
Oct 7, 2020
NVD Last Modified:
Jun 17, 2026
Source:
[email protected]
CVE-2020-24722 Details - Not Deferred