🛡️ Sentinel: Fix potential DoS and sanitize error messages#66
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This commit addresses several security-related issues and improvements across the template handlers: 1. **Information Leakage Prevention**: Updated GraphQL and Bedrock Agent handlers to sanitize error responses and suppress exception chaining (`raise ... from None`). This prevents internal implementation details and tracebacks from leaking to end-users or LLMs. 2. **Denial of Service (DoS) Fix**: Resolved a "poison pill" bug in the DynamoDB Stream handler where incorrect argument types passed to `repository.delete_item` during `REMOVE` events would cause repeated failures, potentially blocking the stream. 3. **Enhanced Error Handling**: Added `try-except` blocks to Bedrock Agent tools to ensure failures are handled gracefully and securely. 4. **Verification**: Updated unit tests in `tests/graphql/test_handler.py` and `tests/agent/test_handler.py` to verify sanitization and ensure no internal details are exposed. All 66 tests pass. 🛡️
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…R feedback) - Address PR feedback in Bedrock Agent handler: use a more concise `create_item` implementation. - Sanitize error messages in GraphQL and Bedrock Agent handlers. - Suppress exception chaining with `raise ... from None`. - Fix argument type in DynamoDB Stream `delete_item` call. - Update tests to verify sanitization.
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🛡️ Sentinel has completed a security review and implemented critical fixes and enhancements to protect the codebase from information leakage and potential Denial of Service (DoS) scenarios.
🚨 Severity: HIGH (DoS) / MEDIUM (Information Leakage)
💡 Vulnerabilities & Fixes:
Information Leakage via Exception Chaining (GraphQL):
raise ... from errorin GraphQL resolvers exposed internal tracebacks via the__cause__attribute.raise ... from Noneto suppress the exception chain while still logging full details internally.Information Leakage to LLM (Bedrock Agent):
try-exceptblocks to tools, returning sanitized error messages.Stream Processing "Poison Pill" (DynamoDB Stream):
delete_itemcaused a crash. In stream processing, failing on the same record repeatedly can block data synchronization (DoS).idfrom the model before deletion.✅ Verification:
tests/graphql/test_handler.pyto assert__cause__ is None.test_error_handling_sanitizationtotests/agent/test_handler.py.tests/stream/test_handler.pyto match the corrected API call.PR created automatically by Jules for task 10589248670957421433 started by @amrabed