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docs: JD-5 Credit Validation Security Analysis#92

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docs: JD-5 Credit Validation Security Analysis#92
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devin/1769167083-jd5-credit-validation-analysis

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docs: JD-5 Credit Validation Security Analysis

Summary

This PR adds a technical analysis document that investigates ticket JD-5 (Credit Limit Validation Flaw Allows Fraudulent Transactions) by performing a comparative analysis of credit validation implementations in Java banking applications.

The document examines secure validation patterns from two repositories:

  • COG-GTM/Springboot-BankApp - AccountService.java withdraw/transfer validation
  • parkerduff/Banking-Project-Spring-Boot-JPA-REST-API- - BankService.java transactional validation

Key findings contrast the flawed COBOL cycle-based calculation (WS-TEMP-BAL = ACCT-CURR-CYC-CREDIT - ACCT-CURR-CYC-DEBIT + DALYTRAN-AMT) with the secure Java approach of validating against actual persisted balances before transaction execution.

The analysis includes:

  • Java implementation patterns with code examples
  • Comparative security analysis table
  • Concrete COBOL fix recommendations with pseudocode
  • Implementation checklist for the remediation team

Ticket: JD-5

Review & Testing Checklist for Human

  • Verify the COBOL fix recommendations (Section 3) are appropriate for your actual COBOL codebase - these are suggested patterns based on the described vulnerability, not tested implementations
  • Confirm the vulnerability scenario in Section 2.2 accurately matches the actual JD-5 ticket details
  • Have a COBOL expert review the recommended SQL transaction boundaries and locking patterns for compatibility with your mainframe environment

Notes

This is a documentation-only change with no functional code modifications. The COBOL recommendations are theoretical patterns derived from analyzing secure Java implementations and should be validated against the actual COBOL system before implementation.

Link to Devin run: https://app.devin.ai/sessions/8f3b774c584a4d08b773a266e6e4e803
Requested by: Joao Esteves (@joao-cognition)

Technical analysis comparing COBOL credit validation vulnerability
with secure Java implementation patterns from banking repositories.

Includes:
- Java implementation patterns from Springboot-BankApp and Banking-Project
- Comparative security analysis (cycle-based vs actual balance)
- Recommendations for COBOL fix with code examples
- Security best practices for transaction validation

Ticket: JD-5
Co-Authored-By: Joao Esteves <joao.esteves@cognition.ai>
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