Samsung Knox is an application that creates a virtual partition (KNOX) within the normal Android operating system that allows a user to run two different Android systems on a same device. It’s a nice security addition and free with new Samsung handsets such as the Galaxy Note 3 and Galaxy S4. Researchers at Israel’s Ben-Gurion University reported a vulnerability in Samsung’s KNOX software, that could allow malicious software to track emails and record data communications. Samsung has responded with an official statement defending its new security feature.
Source: https://thehackernews.com/2014/01/Samsung-Knox-download-encrypted-software-android_12.html