The SHAREit application before 4.0.36 for Android allows a remote attacker (on the same network or joining public “open” Wi-Fi hotspots created by the application when file transfer is initiated) to bypass authentication by trying to fetch a non-existing page. When the non-existing page is requested, the application responds with a 200 status code and empty page, and adds the requesting client device into the list of recognized devices.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-9939
Reference (s):
- https://blog.redforce.io/shareit-vulnerabilities-enable-unrestricted-access-to-adjacent-devices-files/