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    CVE-2020-24722

    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.

    Published:Oct 7, 2020
    Last Modified:Nov 21, 2024
    EPS:Oct 7, 2020
    EPSS Score:0.00698
    CVSS Score:5.9

    Affected Products

    Vendor
    Exposure Notifications Project
    Product
    Exposure Notifications

    Exploits

    http://packetstormsecurity.com/files/159496/GAEN-Protocol-Metadata-Deanonymization-Risk-Score-Inflation.htmlhttp://seclists.org/fulldisclosure/2020/Oct/12http://packetstormsecurity.com/files/159496/GAEN-Protocol-Metadata-Deanonymization-Risk-Score-Inflation.htmlhttp://seclists.org/fulldisclosure/2020/Oct/12

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High