CVE-2016-1919 in KNOX
Summary
by MITRE
Samsung KNOX 1.0 uses a weak eCryptFS Key generation algorithm, which makes it easier for local users to obtain sensitive information by leveraging knowledge of the TIMA key and a brute-force attack.
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Analysis
by VulDB Data Team • 05/15/2026
The vulnerability identified as CVE-2016-1919 affects Samsung KNOX 1.0, a security framework designed to protect mobile devices through encryption and access control mechanisms. This flaw resides in the eCryptFS implementation within the KNOX environment, specifically targeting the key generation algorithm used for encrypting sensitive data. The weakness stems from the use of insufficiently random cryptographic keys that can be exploited by attackers with local access to the device.
The technical implementation of this vulnerability involves the eCryptFS encryption system utilizing a predictable key derivation process that relies on the TIMA key as part of its generation mechanism. This creates a scenario where an attacker with local privileges can potentially reconstruct the encryption keys through brute-force methods or by leveraging known TIMA key information. The weak entropy in the key generation process significantly reduces the cryptographic strength of the encryption, making it vulnerable to offline attacks that would otherwise be computationally infeasible.
From an operational perspective, this vulnerability poses a serious threat to device security as local users can exploit it to access encrypted data without proper authorization. The attack vector requires only local access to the device, making it particularly dangerous in scenarios where devices might be lost or stolen, or where users have administrative privileges. The implications extend beyond simple data theft to potential information disclosure that could compromise user privacy and corporate security. According to CWE-330, this represents a weakness in entropy sources that directly impacts cryptographic strength, while the attack pattern aligns with techniques described in ATT&CK matrix under credential access and privilege escalation domains.
The impact of this vulnerability is particularly concerning given that Samsung KNOX was designed to provide enterprise-grade security for mobile devices. Organizations relying on KNOX for protecting sensitive corporate data may have inadvertently exposed their information to attackers who can leverage this weakness to bypass encryption protections. The vulnerability demonstrates a fundamental flaw in the cryptographic implementation that undermines the security model of the entire KNOX framework. Security professionals should consider this weakness when assessing mobile device security posture, particularly in environments where device-level encryption is critical for compliance with data protection regulations.
Mitigation strategies for this vulnerability include updating to newer versions of Samsung KNOX that address the weak key generation algorithm, implementing additional access controls to limit local user privileges, and considering alternative encryption methods for highly sensitive data. Organizations should also conduct thorough security assessments to identify devices running vulnerable versions of KNOX and ensure proper patch management procedures are in place. The remediation process requires careful attention to ensure that key rotation mechanisms are properly implemented and that the updated systems maintain strong entropy sources for cryptographic key generation.