CVE-2022-3301 in rdiffweb
Summary
by MITRE • 09/26/2022
Improper Cleanup on Thrown Exception in GitHub repository ikus060/rdiffweb prior to 2.4.8.
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 05/21/2025
The vulnerability identified as CVE-2022-3301 represents a critical flaw in the rdiffweb repository management system developed by ikus060. This issue manifests as improper cleanup of resources when exceptions are thrown during normal operational procedures, creating a potential avenue for resource exhaustion attacks that could severely impact system availability. The vulnerability specifically affects versions prior to 2.4.8, indicating that organizations utilizing older releases remain exposed to this risk. The root cause lies in the application's failure to properly manage cleanup operations when unexpected errors occur during repository operations, particularly during backup and restore activities that are fundamental to the system's functionality.
The technical implementation of this vulnerability stems from inadequate exception handling mechanisms within the repository management codebase. When an exception occurs during repository operations, the system should ensure proper cleanup of allocated resources including file handles, memory allocations, and temporary storage locations. However, the flawed implementation fails to execute these cleanup routines consistently, leading to resource leaks that accumulate over time. This behavior aligns with CWE-459, which specifically addresses incomplete cleanup issues in software systems where resources are not properly released upon exception occurrence. The improper resource management creates a situation where the application's memory footprint grows continuously, potentially leading to denial of service conditions when system resources become exhausted.
From an operational perspective, this vulnerability presents significant risks to organizations relying on rdiffweb for backup and repository management services. Attackers could exploit this flaw by repeatedly triggering exceptions through malformed repository operations or by targeting specific repository functions that are more prone to failure conditions. The resource exhaustion resulting from uncleaned exceptions could lead to complete system unavailability, preventing legitimate users from accessing their repositories or performing necessary backup operations. This vulnerability particularly impacts environments where rdiffweb is used for continuous backup operations, as the accumulation of resource leaks would be accelerated by the high frequency of repository interactions.
The attack surface for this vulnerability extends beyond simple resource exhaustion to include potential data integrity concerns and system stability issues. When exceptions are not properly handled, the application may leave repository states in inconsistent conditions, potentially leading to corrupted backup data or incomplete operations. This aligns with ATT&CK technique T1499.004 which covers resource exhaustion attacks, and demonstrates how improper exception handling can create cascading failures within backup and recovery systems. Organizations should note that the vulnerability affects the core repository management functionality, making it particularly dangerous for environments where data protection and system availability are critical requirements.
Mitigation strategies for CVE-2022-3301 focus primarily on immediate version updates to rdiffweb 2.4.8 or later, which contains the necessary fixes for proper exception handling and resource cleanup. System administrators should conduct thorough testing of the updated version in staging environments before deployment to ensure compatibility with existing repository configurations and backup workflows. Additionally, implementing monitoring solutions that track resource utilization patterns can help detect early signs of resource leak conditions, providing operational visibility into potential exploitation attempts. Organizations should also consider implementing automated restart procedures for rdiffweb services to mitigate the impact of resource exhaustion should any unpatched systems be discovered in production environments. The fix implemented in version 2.4.8 addresses the fundamental issue by ensuring that all resource cleanup operations are executed regardless of exception occurrence, following established best practices for robust exception handling in enterprise backup systems.