CVE-2020-24722
CVSS V2 Low 2.6
CVSS V3 Medium 5.9
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."
Overview
- CVE ID
- CVE-2020-24722
- Assigner
- cve@mitre.org
- Vulnerability Status
- Analyzed
- Published Version
- 2020-10-07T15:15:12
- Last Modified Date
- 2020-10-23T02:26:32
Weakness Enumerations
CPE Configuration (Product)
| CPE | Vulnerable | Operator | Version Start | Version End |
|---|---|---|---|---|
| cpe:2.3:a:exposure_notifications_project:exposure_notifications:*:*:*:*:*:android:*:* | 1 | OR | 2020-10-05 | |
| cpe:2.3:a:exposure_notifications_project:exposure_notifications:*:*:*:*:*:iphone_os:*:* | 1 | OR | 2020-10-05 |
CVSS Version 2
- Version
- 2.0
- Vector String
- AV:N/AC:H/Au:N/C:N/I:P/A:N
- Access Vector
- NETWORK
- Access Compatibility
- HIGH
- Authentication
- NONE
- Confidentiality Impact
- NONE
- Integrity Impact
- PARTIAL
- Availability Impact
- NONE
- Base Score
- 2.6
- Severity
- LOW
- Exploitability Score
- 4.9
- Impact Score
- 2.9
CVSS Version 3
- Version
- 3.1
- Vector String
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
- Attack Vector
- NETWORK
- Attack Compatibility
- HIGH
- Privileges Required
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality Impact
- NONE
- Availability Impact
- NONE
- Base Score
- 5.9
- Base Severity
- MEDIUM
- Exploitability Score
- 2.2
- Impact Score
- 3.6
References
| Reference URL | Reference Tags |
|---|---|
| http://seclists.org/fulldisclosure/2020/Oct/12 | Exploit Mailing List Third Party Advisory |
| https://github.com/google/exposure-notifications-internals/blob/main/en-risks-and-mitigations-faq.md#additional-considerations | Third Party Advisory |
| https://blog.google/inside-google/company-announcements/update-exposure-notifications | Third Party Advisory |
| http://packetstormsecurity.com/files/159496/GAEN-Protocol-Metadata-Deanonymization-Risk-Score-Inflation.html | Exploit Third Party Advisory VDB Entry |
Sources
| Source Name | Source URL |
|---|---|
| NIST | https://nvd.nist.gov/vuln/detail/CVE-2020-24722 |
| MITRE | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-24722 |
History
| Created | Old Value | New Value | Data Type | Notes |
|---|---|---|---|---|
| 2022-05-10 16:22:24 | Added to TrackCVE | |||
| 2022-12-04 23:49:40 | 2020-10-07T15:15Z | 2020-10-07T15:15:12 | CVE Published Date | updated |
| 2022-12-04 23:49:40 | 2020-10-23T02:26:32 | CVE Modified Date | updated | |
| 2022-12-04 23:49:40 | Analyzed | Vulnerability Status | updated |