Race Condition in RDK-B WebUI Allows Unauthorized Access

Executive Summary

This vulnerability is a race condition in the file check.jst within the RDK-B WebUI version rdkb-2025q4-kirkstone.04.10.26. A race condition occurs when the system's behavior depends on the sequence or timing of uncontrollable events. In this case, concurrent authentication requests can exploit shared authentication state, allowing a remote attacker to gain unauthorized access.

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Detection Guidance

This vulnerability involves a race condition in the authentication mechanism of RDK-B WebUI. Detection requires monitoring for concurrent authentication requests that may exploit shared state. Check WebUI logs for repeated or overlapping login attempts from the same or different sources. Look for unusual patterns in authentication state changes during login processes.

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Impact Analysis

This vulnerability could allow unauthorized individuals to gain access to the RDK-B WebUI system by exploiting timing issues during authentication. If exploited, attackers might bypass security controls and perform actions as if they were legitimate users.

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Compliance Impact

This vulnerability could potentially violate compliance with GDPR and HIPAA due to unauthorized access risks. A race condition allowing remote attackers to exploit shared authentication state may lead to unauthorized data access or modification, which conflicts with GDPR's data protection principles and HIPAA's security requirements for safeguarding sensitive information.

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Mitigation Strategies

Immediately update RDK-B WebUI to the latest patched version to address the race condition in check.jst. Implement rate limiting on authentication endpoints to prevent concurrent requests from overwhelming the system. Monitor authentication logs for unusual patterns indicating exploitation attempts.

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