CVE-2020-24722

Katalog CVE

CVSS 5.9 · Medium EPSS 2,5%

Kerentanan Authentication Bypass by Capture-replay pada exposure notifications project exposure notifications. Skor CVSS 3.1 5.9 (Medium) menurut NVD.

Deskripsi (NVD)

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.

Rincian

Terbit di NVD

7 Oktober 2020

Terakhir diubah

17 Juni 2026

Status NVD

Modified

CVSS 3.1

5.9 (Medium), sumber NVD
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-294: Authentication Bypass by Capture-replay

EPSS (30 hari)

2,5% peluang dieksploitasi; lebih tinggi dari 84,0% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• http://packetstormsecurity.com/files/159496/GAEN-Protocol-Metadata-Deanonymization-Risk-Score-Inflation.html exploit · advisory pihak ketiga · vdb entry
• http://seclists.org/fulldisclosure/2020/Oct/12 exploit · mailing list · advisory pihak ketiga
• https://blog.google/inside-google/company-announcements/update-exposure-notifications advisory pihak ketiga
• https://github.com/google/exposure-notifications-internals/blob/main/en-risks-and-mitigations-faq.md#additiona... advisory pihak ketiga