CVE Vulnerability

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."

2.6 /10

CVSS v2.0 :

V3 Legend

Vector :

Exploitability : 4.9 / Impact : 2.9

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Confidentiality Impact NONE

Integrity Impact PARTIAL

Availability Impact NONE

Scope

5.9 /10

CVSS v3.0 : 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

References
Link Resource
http://seclists.org/fulldisclosure/2020/Oct/12 Exploit Mailing List
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
Configurations

Configuration 1

cpe:2.3:a:exposure_notifications_project:exposure_notifications:*:*:*:*:*:android:*:*
cpe:2.3:a:exposure_notifications_project:exposure_notifications:*:*:*:*:*:iphone_os:*:*
Information

Published : 2020-10-07 03:15

Updated : 2020-10-23 02:26

NVD link : CVE-2020-24722

Mitre link : CVE-2020-24722

Products Affected
No products.
CWE
CWE-294

Authentication Bypass by Capture-replay