Samsung Knox
| Company type | Proprietary software |
|---|---|
| Industry | Mobile device management, Mobile security |
| Founder | Samsung Electronics |
| Products | Mobile device management system, Security platform |
| Owner | Samsung Electronics |
Samsung Knox represents a proprietary security and mobile device management (MDM) system, integrated by default into the majority of Samsung smartphones and tablets. It leverages hardware-based ARM TrustZone technology to enhance device protection. Knox supports the administration of corporate assets, including employee mobile devices, interactive kiosks, and barcode scanners. Similar to other MDM solutions, it enables enterprises to regulate pre-installed apps, device configurations, startup animations, as well as home screen and lock screen layouts.
Overview
Knox delivers both trusted computing capabilities and mobile device management functionalities. Its underlying hardware foundation incorporates an implementation of ARM TrustZone, combined with a secure bootloader stored in read-only memory (ROM) and robust secure boot processes comparable to dm-verity and AVB. These trusted execution environments safeguard sensitive information such as cryptographic keys and digital certificates.
Through MDM features, organizations can tailor devices to meet specific operational requirements. IT administrators have the ability to enroll new hardware, integrate with unified endpoint management (UEM) platforms, establish organizational policies governing device usage, and perform over-the-air firmware updates. Knox’s MDM services are accessible via web portals, APIs, or proprietary software development kits (SDKs).
In 2014, certain Samsung devices equipped with Knox received approval for use within US government agencies, provided they were not utilized for storing classified information.
Starting with Android 8, Knox has been employed to prevent applications from gaining root privileges even after the device has been rooted.
However, in October 2014, security analysis revealed that Knox stored user PINs in plaintext format rather than utilizing salted hashes or obfuscated code for protection.
In May 2016, researchers Uri Kanonov and Avishai Wool identified three security vulnerabilities affecting specific Knox versions.
Further security weaknesses were uncovered in 2017 by Google's Project Zero team, highlighting potential risks despite Knox’s certifications for Department of Defense (DoD) and National Security Agency (NSA) compliance.
e-Fuse
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Samsung Knox-enabled devices utilize an e-fuse as an indicator to record whether an "untrusted" boot sequence—meaning one not authorized by Samsung—has ever been executed. The e-fuse will be triggered under any of the following conditions:
- The device initiates booting using a bootloader, kernel, kernel initialization script, or data that lacks Samsung's digital signature.
- The device has been rooted.
- Detection of custom firmware occurs, including Android versions not released by Samsung.
For Galaxy Book models starting with the Galaxy Book 4, upgrading the Windows operating system from one version to another (for example, from 22H2 to 23H2) will not activate the e-fuse; however, upgrading to a higher edition (such as moving from Home to Pro) willTemplate:Fix/category[citation needed].
When the e-fuse is triggered, the message "Set warranty bit: <reason>" is displayed. Once this fuse is blown, the device loses the capability to create a Knox Workspace container or access data stored in any previously established Knox Workspace.[1] In the United States, Samsung may use this information as grounds to refuse warranty service on devices modified in such ways.[2] Warranty voidance based on these actions could be restricted under the Magnuson–Moss Warranty Act of 1975, particularly when the malfunction is unrelated to rooting.[3] Besides voiding warranties, activating the e-fuse also disables certain preinstalled applications, including Secure Folder and Samsung Pay.Template:Fix/category[citation needed] For some earlier Knox versions, it might be feasible to reset the e-fuse by installing custom firmware.[4]
See also
References
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External links
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