Incorrect Numeric Conversion Leads to Buffer Overflow in MongoDB C++ Driver

Executive Summary

This vulnerability involves an incorrect numeric type conversion in the BSON document building component of the MongoDB C++ Driver. When an extremely large, non-terminated field name is supplied to the builder, the library may read memory outside the intended buffer and terminate the calling process. No authentication is required, but the calling application must pass the oversized name in a specific form.

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Detection Guidance

This vulnerability requires an application to pass an extremely large, non-terminated field name to the MongoDB C++ Driver's BSON document builder. Detection would involve monitoring for applications attempting to use such field names or unusual memory access patterns in the driver. No specific commands are provided in the context.

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Impact Analysis

This vulnerability could cause the application to crash by reading memory outside the intended buffer. It may lead to denial of service if the application terminates unexpectedly. The impact depends on how the MongoDB C++ Driver is used in the application.

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Mitigation Strategies

Update the MongoDB C++ Driver to the latest patched version. Review applications using the driver to ensure they do not pass extremely large or malformed field names to the BSON builder. Apply input validation to prevent such field names from being processed.

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