CVE-2025-2888 in tough
Summary
by MITRE • 03/28/2025
During a snapshot rollback, the client incorrectly caches the timestamp metadata. If the client checks the cache when attempting to perform the next update, the update timestamp validation will fail, preventing the next update until the cache is cleared. Users should upgrade to tough version 0.20.0 or later and ensure any forked or derivative code is patched to incorporate the new fixes.
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Analysis
by VulDB Data Team • 09/19/2025
This vulnerability affects the timestamp metadata handling during snapshot rollback operations within the tough client implementation. The core issue manifests when the client caches timestamp information during a rollback event, creating a stale metadata state that persists beyond its intended validity period. This caching behavior violates fundamental principles of temporal consistency and cache invalidation mechanisms that should ensure data integrity during system transitions. The flaw represents a classic case of improper state management where cached metadata becomes decoupled from the actual system state, creating a discrepancy that manifests during subsequent update operations.
The technical implementation flaw stems from inadequate cache invalidation protocols during rollback scenarios. When a snapshot rollback occurs, the system should invalidate or refresh all related metadata caches to maintain consistency with the restored state. However, the current implementation fails to properly invalidate timestamp caches, leading to a situation where the client maintains outdated timestamp information in its local cache. This creates a validation failure during subsequent update attempts, as the system compares the cached timestamp against current system time or state, finding a mismatch that triggers the update rejection mechanism. The vulnerability demonstrates poor adherence to cache coherence principles and highlights the importance of proper temporal state management in distributed systems.
The operational impact of this vulnerability extends beyond simple update failures to potentially disrupt system availability and data consistency. When the update timestamp validation fails, users experience service interruptions as the system becomes unable to process subsequent updates until the cache is manually cleared or the system restarts. This creates a cascading effect where legitimate update operations are blocked, potentially leading to stale data states or delayed system maintenance. The vulnerability affects the reliability of the update mechanism and can result in extended downtime during critical maintenance windows. Organizations relying on this system may experience increased operational overhead as administrators must manually clear caches or implement workarounds to restore update functionality.
Mitigation strategies should focus on implementing proper cache invalidation mechanisms during rollback operations and upgrading to the patched version 0.20.0 or later. The recommended approach involves ensuring that all timestamp metadata caches are invalidated immediately following rollback events, preventing stale data from persisting in the system. System administrators should also implement monitoring to detect cache-related update failures and establish automated procedures for cache clearing when such failures occur. This vulnerability aligns with CWE-200, which addresses improper error handling, and CWE-502, relating to deserialization of untrusted data, as the cached metadata represents a form of serialized system state that becomes invalid. From an ATT&CK perspective, this vulnerability could be leveraged to create persistent service disruption through cache poisoning or denial of service scenarios, particularly in systems where update operations are critical for maintaining system integrity. Organizations should also review any forked or derivative code implementations to ensure they incorporate the proper cache invalidation logic that addresses this specific temporal metadata handling issue.