Executive Summary

This vulnerability is an Insecure Direct Object Reference (IDOR) in the Whisper Money application versions prior to 0.1.5. It allows an authenticated user to update or create account balances in other users' bank accounts by bypassing proper ownership validation. Essentially, the application did not properly check if the user making the request actually owned the account they were trying to modify, enabling unauthorized access and manipulation of other users' financial data. [1, 2]

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Impact Analysis

This vulnerability can impact you by allowing unauthorized users to alter your bank account balances within the Whisper Money application. This compromises the integrity and authorization controls of your financial data, potentially leading to incorrect account balances, financial loss, or unauthorized financial actions performed on your behalf. [2, 1]

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Detection Guidance

This vulnerability can be detected by attempting to update or create account balances on bank accounts that do not belong to the authenticated user, specifically targeting the "sync/balances" endpoint. Since the issue is an Insecure Direct Object Reference (IDOR), you can test by sending HTTP requests with account IDs of other users and observing if the system allows unauthorized modifications. For example, using curl commands to send POST or PUT requests to the endpoint with different account IDs and checking for unauthorized success responses or forbidden errors can help detect the vulnerability. Specific commands are not provided in the resources, but the approach involves testing authorization enforcement on resource access. [2, 1]

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Mitigation Strategies

The immediate mitigation step is to upgrade the Whisper Money application to version 0.1.5 or later, where the vulnerability has been fixed. The fix enforces user ownership checks on all resource accesses and modifications by validating that referenced entities (accounts, categories, labels) belong to the authenticated user. This prevents unauthorized users from updating or creating account balances on other users' bank accounts. If upgrading is not immediately possible, implementing strict authorization checks on the "sync/balances" endpoint to ensure users can only modify their own data is critical. [1, 2]

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Compliance Impact

The provided resources do not explicitly discuss the impact of this vulnerability on compliance with common standards and regulations such as GDPR or HIPAA. However, since the vulnerability allows unauthorized users to update or create account balances in other users' bank accounts, it potentially compromises data integrity and confidentiality, which are critical aspects of compliance with data protection regulations. The fix enforces strict ownership validation to prevent unauthorized access, which would help in maintaining compliance by protecting user data from unauthorized modification. [1, 2]

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