Description
An issue was discovered in the GAEN (aka Google/Apple Exposure Notifications) protocol through 2020-09-29, as used in COVID-19 applications on Android and iOS. It allows a user to be put in a position where he or she can be coerced into proving or disproving an exposure notification, because of the persistent state of a private framework.
References
- https://blog.google/inside-google/company-announcements/update-exposure-notifications
- https://github.com/minvws/nl-covid19-notification-app-coordination/blob/master/CVEs/CVE-2020-24721.txt
- FULLDISC: 20200929 CVE-2020-24721: Corona Exposure Notifications API: risk of coercion/data leakage [vs] mailing-list
- http://packetstormsecurity.com/files/159419/Corona-Exposure-Notifications-API-Data-Leakage.html