CVE-2018-8319 in Research JavaScript Cryptography Library
Summary
by MITRE
A Security Feature Bypass vulnerability exists in MSR JavaScript Cryptography Library that is caused by incorrect arithmetic computations, aka "MSR JavaScript Cryptography Library Security Feature Bypass Vulnerability." This affects Microsoft Research JavaScript Cryptography Library.
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Analysis
by VulDB Data Team • 04/06/2023
The CVE-2018-8319 vulnerability represents a critical security feature bypass in Microsoft Research's JavaScript Cryptography Library, demonstrating how mathematical errors can undermine cryptographic protections. This flaw specifically manifests in the library's handling of arithmetic computations, creating a pathway for attackers to circumvent intended security measures. The vulnerability affects the MSR JavaScript Cryptography Library, which was designed to provide cryptographic functions within JavaScript environments, making it particularly concerning given the widespread use of JavaScript in web applications and browser environments.
The technical root cause of this vulnerability lies in incorrect arithmetic computations that occur within the cryptographic algorithms implemented in the library. When cryptographic functions perform mathematical operations with flawed precision or incorrect handling of numerical values, the resulting computations can produce outputs that do not meet the expected security properties. This mathematical error creates a condition where the library fails to properly validate or enforce cryptographic constraints, allowing unauthorized access or bypass of security controls that should normally be in place. The vulnerability specifically impacts the library's ability to maintain proper cryptographic integrity during computation processes, potentially enabling attackers to manipulate cryptographic operations without detection.
The operational impact of CVE-2018-8319 extends beyond simple cryptographic weakness to encompass broader security implications for systems relying on the affected library. Organizations using the MSR JavaScript Cryptography Library in their web applications, browser extensions, or JavaScript-based security implementations face potential exposure to attacks that could compromise data integrity, authentication mechanisms, or encryption protections. The vulnerability's classification as a security feature bypass means that even if proper cryptographic protocols are implemented, the flawed arithmetic computations effectively render these protections ineffective. This creates a scenario where attackers can potentially access protected resources or manipulate cryptographic operations without triggering the intended security controls, making the vulnerability particularly dangerous in environments where JavaScript-based cryptography is utilized for sensitive operations.
This vulnerability aligns with CWE-682, which specifically addresses incorrect arithmetic operations in software systems, and demonstrates how mathematical errors can translate into serious security consequences. The flaw also relates to ATT&CK technique T1070.004, which covers "File and Directory Permissions Modification," as the bypass could potentially enable attackers to modify cryptographic parameters or access restricted resources. Organizations should implement immediate mitigation strategies including updating to patched versions of the MSR JavaScript Cryptography Library, conducting thorough security assessments of systems using the library, and implementing additional monitoring for unauthorized cryptographic operations. The vulnerability underscores the critical importance of mathematical precision in cryptographic implementations and highlights the need for comprehensive testing of arithmetic operations within security-critical code to prevent similar issues from occurring in other cryptographic libraries or systems.