T09 · Insecure Skill Coding Practices
Error
- Location
- src/adapters/circle.ts:190
- Finding
- Circle API failures are converted into fabricated successful transfers<![CDATA[ ## Vulnerability Details **File Location**: `src/adapters/circle.ts:84-87`, `src/adapters/circle.ts:108-111`, `src/adapters/circle.ts:190-196`, `src/adapters/circle.ts:233-238`, `src/cli/commands/borrow.ts:90-98`, `src/cli/commands/repay.ts:69-83` **Vulnerability Type**: Fail-open financial transaction handling **Risk Level**: High ### Vulnerable Code The Circle adapter substitutes mock state when real Circle operations fail: ```ts } catch { // If Circle API fails, return mock pool wallet return MOCK_WALLETS['credit-pool']; } ``` ```ts try { return await client.getBalance(walletId); } catch { // If Circle API fails (e.g., network error), return mock balance return 10000; } ``` Failed disbursements are represented as successful completed transactions: ```ts } catch (error) { // If Circle API fails, return mock success for demo return { success: true, transactionId: `mock-tx-${Date.now()}`, status: 'COMPLETE', }; } ``` Failed repayments are handled in the same way: ```ts } catch (error: any) { // If Circle API fails, return mock success for demo return { success: true, transactionId: `mock-repay-${Date.now()}`, status: 'COMPLETE', }; } ``` The borrowing command trusts this fabricated result and records a loan: ```ts const result = await disburseLoan(agent.walletAddress, amount, poolWallet.id); if (result.success || result.status === 'INITIATED') { // Update agent ledger agentRegistry.updateOutstandingLoan(agent.id, amount); console.log(`✅ Loan created successfully!`); console.log(` Amount: ${amount} USDC`); console.log(` Transaction ID: ${result.transactionId || 'N/A'}`); console.log(` Status: ${result.status || 'PENDING'}\n`); } else { console.error(`❌ Transfer failed: ${result.error}\n`); } ``` The repayment command similarly reduces debt based ...[truncated 2726 chars]
- Remediation
- <![CDATA[ ## Remediation Suggestions 1. Return `success: false` whenever a real Circle API operation throws or returns a rejected status. 2. Never fall back to mock wallets, balances, or transaction results after real Circle configuration has been detected. 3. Make mock mode an explicit configuration value, such as `MOCK_MODE=true`, and prohibit it in production environments. 4. Use distinct result types for real and mock transactions so the command layer cannot confuse them. 5. Record a transaction as pending after submission and update the loan balance only after Circle reports a confirmed or complete transaction. 6. Independently call `getTransactionStatus()` before finalizing disbursement or repayment state. 7. Preserve and securely log the original Circle error and provider request identifier for reconciliation. 8. Use idempotency keys and atomic ledger transitions to prevent duplicate submissions or inconsistent retry behavior. 9. Add tests proving that timeouts, rejected transactions, invalid credentials, and insufficient funds never alter confirmed loan balances. ]]>