One feature that is available on most classic Bluetooth implementations is answering via Bluetooth pings. Everything an attacker needs to know is the device’s Bluetooth address. Even if the target is not discoverable, it typically accepts connections if it gets addressed. ERNW Insinuator discusses vulnerability CVE-2020-0022 which is an Android 8.0-9.0 Bluetooth Zero-Click remote code execution (RCE) – also called BlueFrag.

In the following, we describe a Bluetooth zero-click short-distance RCE exploit against Android 9, which got assigned CVE-2020-0022 . We go through all steps required to establish a remote shell on a Samsung Galaxy S10e, which was working on an up-to-date Android 9 when reporting the issue on November 3 2019. The initial flaw used for this exploit is still present in Android 10, but we utilize an additional bug in Bionic (Android’s libc implementation), which makes exploitation way easier. The bug was finally fixed in the security patch from 1.2.2020 in A-143894715.

A demonstration video is above. See more in the article here.