Integer Overflow in Dynamodb

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How Integer Overflow Manifests in Dynamodb

Integer overflow in DynamoDB manifests through specific patterns that exploit the service's numeric handling and capacity management systems. Unlike traditional databases where integer overflow might cause data corruption, DynamoDB's managed nature creates different attack vectors.

The most common manifestation occurs in provisioned throughput exhaustion attacks. When an attacker sends requests with intentionally malformed numeric values that cause client-side integer overflows, DynamoDB's request processing can consume excessive read/write capacity units. For example, a 64-bit integer overflow in client code might generate a timestamp far in the future, causing DynamoDB to process the request inefficiently.

Dynamodb-Specific Detection

Detecting integer overflow vulnerabilities in DynamoDB requires specialized scanning approaches that understand the service's unique characteristics. Traditional static analysis tools miss DynamoDB-specific patterns.

middleBrick's DynamoDB-aware scanning examines API endpoints that interact with DynamoDB, looking for patterns that could lead to overflow conditions. The scanner tests for:

  • Malformed numeric inputs in API parameters that could overflow when converted to DynamoDB's number type
  • Conditional expressions with extreme numeric values
  • Timestamp manipulation attempts
  • Sort key generation patterns vulnerable to overflow

The scanner actively probes endpoints with boundary values designed to trigger overflow conditions in DynamoDB's processing pipeline. For example, it tests with values like 2^63-1, 2^64, and negative values that might wrap around.
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