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CVE-2020-24722

Status Candidate

Overview

** 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."

Related Files

GAEN Protocol Metadata Deanonymization / Risk-Score Inflation
Posted Oct 5, 2020
Authored by Stefan Marsiske

The TX Power value in the metadata in the beacon of the GAEN protocol used by the corona/contact tracing app allows for attackers to influence risk-score calculations in their favor and the same metadata can also be used to deanonymize diagnosed users based on the type of phone they are using.

tags | advisory, protocol
advisories | CVE-2020-24722
SHA-256 | 327419dece0900ea7e5541c080133f27f84f526d86f6c2191e14654349a7f444
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