![]() The initial IV reuse attack is tracked as CVE-2021-25444 with a ‘high’ severity rating, and patched in August 2021. The researchers disclosed their findings to Samsung in August 2021 and the manufacturer addressed the issues by publishing the flaws to the Common Vulnerabilities and Exposures (CVE) register. The attacker would not need to be able to run code in the Android kernel, just be able to execute code in the Android user mode. ![]() In approaching the research, the academics assumed an attacker could fully compromise the Normal World through mechanisms such as malware granting root privileges. The researchers were able to show how Samsung devices were vulnerable to the IV reuse attack, allowing attackers to assign IVs as part of the key parameters. The encryption standard protects items using the same key and relies on unique initialization vectors (IVs) never being reused. This allows an attacker to predictably obtain the cryptographic keys if they know the contents of one plaintext sample encrypted using AES-GCM. You may have to select a menu option or click a button.The Android Keystore provides hardware-backed cryptographic key management via the Keymaster Hardware Abstraction Layer (HAL) and this is implemented in the Secure World of the TrustZone, where processes are not supposed to be accessed from the outside.Ĭryptographic keys are protected here using the AES-GCM encryption standard, but Samsung’s implementation of Keystore, which allows keys to be retrieved and stored (while wrapped by an encrypted layer) from the Secure World by apps operating in the Normal World, is flawed. Follow the instructions for disabling the ad blocker on the site you’re viewing.You may have more than one ad-blocker installed. You’ll usually find this icon in the upper right-hand corner of your screen. ![]()
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