CVE-2020-24722
Global infos:
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.
CVE Status: Modified
References:
Metrics:
| Attribute | Value |
|---|---|
| Attack Complexity | HIGH |
| Attack Vector | NETWORK |
| Availability Impact | NONE |
| Base Score | 5.9 |
| Base Severity | MEDIUM |
| Confidentiality Impact | NONE |
| Integrity Impact | HIGH |
| Privileges Required | NONE |
| Scope | UNCHANGED |
| User Interaction | NONE |
| Vector String | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N |
| Exploitability Score | 2.2 |
| Impact Score | 3.6 |
| Source | [email protected] |
| Type | Primary |