CVE-2020-24722

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2020-24722
** 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."

5.9 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 2.2 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

2.6 /10

CVSS v2.0 : LOW

V2 Legend

Vector : AV:N/AC:H/Au:N/C:N/I:P/A:N

Exploitability : 4.9 / Impact : 2.9

Access Vector NETWORK

Access Complexity HIGH

Authentication NONE

Confidentiality Impact NONE

Integrity Impact PARTIAL

Availability Impact NONE

References
Link Resource
http://packetstormsecurity.com/files/159496/GAEN-Protocol-Metadata-Deanonymization-Risk-Score-Inflation.html Exploit Third Party Advisory VDB Entry
http://seclists.org/fulldisclosure/2020/Oct/12 Exploit Mailing List Third Party Advisory
https://blog.google/inside-google/company-announcements/update-exposure-notifications Third Party Advisory
https://github.com/google/exposure-notifications-internals/blob/main/en-risks-and-mitigations-faq.md#additional-considerations Third Party Advisory
http://packetstormsecurity.com/files/159496/GAEN-Protocol-Metadata-Deanonymization-Risk-Score-Inflation.html Exploit Third Party Advisory VDB Entry
http://seclists.org/fulldisclosure/2020/Oct/12 Exploit Mailing List Third Party Advisory
https://blog.google/inside-google/company-announcements/update-exposure-notifications Third Party Advisory
https://github.com/google/exposure-notifications-internals/blob/main/en-risks-and-mitigations-faq.md#additional-considerations Third Party Advisory
Configurations

Configuration 1 (hide)

OR cpe:2.3:a:exposure_notifications_project:exposure_notifications:*:*:*:*:*:android:*:*
cpe:2.3:a:exposure_notifications_project:exposure_notifications:*:*:*:*:*:iphone_os:*:*
History

21 Nov 2024, 05:15

Type Values Removed Values Added
References () http://packetstormsecurity.com/files/159496/GAEN-Protocol-Metadata-Deanonymization-Risk-Score-Inflation.html - Exploit, Third Party Advisory, VDB Entry () http://packetstormsecurity.com/files/159496/GAEN-Protocol-Metadata-Deanonymization-Risk-Score-Inflation.html - Exploit, Third Party Advisory, VDB Entry
References () http://seclists.org/fulldisclosure/2020/Oct/12 - Exploit, Mailing List, Third Party Advisory () http://seclists.org/fulldisclosure/2020/Oct/12 - Exploit, Mailing List, Third Party Advisory
References () https://blog.google/inside-google/company-announcements/update-exposure-notifications - Third Party Advisory () https://blog.google/inside-google/company-announcements/update-exposure-notifications - Third Party Advisory
References () https://github.com/google/exposure-notifications-internals/blob/main/en-risks-and-mitigations-faq.md#additional-considerations - Third Party Advisory () https://github.com/google/exposure-notifications-internals/blob/main/en-risks-and-mitigations-faq.md#additional-considerations - Third Party Advisory
Information

Published : 2020-10-07 15:15

Updated : 2024-11-21 05:15

NVD link : CVE-2020-24722

Mitre link : CVE-2020-24722

CVE.ORG link : CVE-2020-24722

JSON object : View

Products Affected

exposure_notifications_project

  • exposure_notifications
CWE
CWE-294

Authentication Bypass by Capture-replay