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Fix: Code injection vulnerability (CodeQL #5) #30

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Fix: Code injection vulnerability (CodeQL #5) #30

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@jmaddington jmaddington commented Mar 31, 2025

Summary

  • Added proper input validation before evaluating user input as code
  • Created isValidChartConfig function to detect and block potentially dangerous patterns
  • Added JSON.parse as the primary method for handling user input
  • Added strict mode to prevent many JavaScript exploit techniques
  • Added additional safety checks and improved error messages

Test plan

  • JSON input should work exactly as before
  • JavaScript object literals that are safe will still be accepted
  • Input containing dangerous patterns (like eval, setTimeout, require, etc.) will be rejected
  • Input is verified for proper structure and syntax before execution

Security improvements

  • Prevents arbitrary code execution through user input
  • Blocks over 30 different dangerous patterns that could be used for attacks
  • Adds multiple layers of validation to ensure safety

Closes #22

🤖 Generated with Claude Code

@jmaddington @claude
Fix: Code injection vulnerability in chart rendering
24a1ed1 
- Added proper input validation before evaluating user input as code
- Created isValidChartConfig function to detect and block potentially dangerous patterns
- Added JSON.parse as the primary method for handling user input
- Added strict mode to prevent many JavaScript exploit techniques
- Added additional safety checks and improved error messages

Closes #22

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>
github-advanced-security[bot]
github-advanced-security bot found potential problems Mar 31, 2025
View reviewed changes
lib/charts.js
'getGradientFillHelper',
'pattern',
'Chart',
`"use strict"; return ${untrustedChart}`,

Check failure

Code scanning / CodeQL

Code injection Critical

This code execution depends on a
user-provided value
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This code execution depends on a
user-provided value
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This code execution depends on a
user-provided value
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This code execution depends on a
user-provided value
Loading
.
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Security: Fix code injection vulnerability (CodeQL #5)

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@jmaddington