CVE-2022-28355 in Scala.js
Summary
by MITRE • 04/03/2022
randomUUID in Scala.js before 1.10.0 generates predictable values.
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Analysis
by VulDB Data Team • 04/05/2022
The vulnerability identified as CVE-2022-28355 affects the Scala.js library version prior to 1.10.0, specifically targeting the randomUUID function implementation. This flaw represents a critical weakness in cryptographic randomness generation that can have significant security implications for applications relying on pseudo-random number generation for security-sensitive operations. The issue stems from the predictable nature of the generated UUID values, which undermines the fundamental security properties expected from cryptographic random number generators.
The technical flaw manifests in the implementation of the randomUUID function within Scala.js, where the underlying random number generation algorithm fails to produce sufficiently unpredictable outputs. This predictability arises from inadequate seeding of the random number generator or use of deterministic algorithms that do not properly incorporate entropy sources. When applications generate UUIDs using this vulnerable function, they create identifiers that can be reasonably guessed or reconstructed by adversaries, particularly when the same seed values or predictable patterns are used. The vulnerability directly relates to CWE-330, which addresses insufficient entropy in random number generation, and can be classified under the broader category of weak randomness issues in software libraries.
The operational impact of this vulnerability extends beyond simple predictability concerns to encompass serious security implications for applications that depend on UUIDs for session management, authentication tokens, cryptographic key generation, or other security-critical functions. Attackers who can predict UUID values can potentially impersonate users, gain unauthorized access to systems, or exploit time-based security mechanisms that rely on unpredictable identifiers. This vulnerability particularly affects web applications built with Scala.js that utilize UUIDs for security purposes, making them susceptible to session hijacking, privilege escalation, and other attack vectors that exploit predictable identifiers. The weakness becomes more pronounced when applications reuse the same random seed or when the entropy sources are insufficiently diversified.
Mitigation strategies for CVE-2022-28355 primarily involve upgrading to Scala.js version 1.10.0 or later, which contains the corrected randomUUID implementation. Organizations should conduct comprehensive vulnerability assessments to identify all applications utilizing the affected library and prioritize remediation efforts accordingly. Additionally, system administrators should implement monitoring for any suspicious activities that might indicate exploitation attempts, particularly around session management and authentication mechanisms. Security teams should consider implementing additional layers of protection such as token rotation, enhanced entropy sources, and proper validation of UUID generation in security-sensitive contexts. The vulnerability also highlights the importance of adhering to security best practices as outlined in the MITRE ATT&CK framework, specifically addressing techniques related to credential access and privilege escalation that could leverage predictable identifiers for unauthorized system access. Organizations should also consider implementing entropy gathering mechanisms and ensuring that cryptographic libraries properly incorporate sufficient randomness sources to prevent similar vulnerabilities in other components of their software stack.