Potential fix for code scanning alert no. 58: Double escaping or unescaping #5747
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Summary of ChangesHello @christopherholland-workday, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request implements a fix for a code scanning alert related to incorrect handling of escaped characters. By adjusting the sequence of unescaping operations, it ensures that backslashes are processed last, preventing unintended double unescaping and improving the robustness of string parsing. Highlights
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Code Review
This pull request correctly addresses a double-unescaping vulnerability by reordering the string replacement operations. The fix is effective in preventing incorrect data manipulation. I've also suggested a small refactoring to make the unescaping logic more robust and maintainable for the future.
| let cleanedValue = value | ||
| .replace(/\\"/g, '"') // \" -> " | ||
| .replace(/\\\\/g, '\\') // \\ -> \ | ||
| .replace(/\\\[/g, '[') // \[ -> [ | ||
| .replace(/\\\]/g, ']') // \] -> ] | ||
| .replace(/\\\{/g, '{') // \{ -> { | ||
| .replace(/\\\}/g, '}') // \} -> } | ||
| .replace(/\\\\/g, '\\') // \\ -> \ (unescape backslash last) |
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While the reordering of replace calls fixes the double-unescaping issue, a more robust and maintainable approach would be to use a single replace call with a replacer function. This avoids the fragility of chained replace calls where order matters and combines all unescaping logic into one place, making it easier to manage.
let cleanedValue = value.replace(/\\([\\"{}\[\]])/g, (_match, char) => char);There was a problem hiding this comment.
While this is more concise, and maybe "better" - I think that the understand-ability is diminished which could lead to error
christopherholland-workday
requested review from
0xi4o,
igor-magun-wd and
yau-wd
2 participants
Potential fix for https://github.com/FlowiseAI/Flowise/security/code-scanning/58
To fix this issue, we need to ensure that the unescaping of the escape character (backslash,
\\) happens after all other unescaping steps, not before. This means we should delay the.replace(/\\\\/g, '\\')line until we've already unescaped special characters (quotes, brackets, braces, etc.). In other words, rearrange the replacement sequence so every backslash-unescape happens after all other unescapes. The fix is to move.replace(/\\\\/g, '\\')to the end of the chain (after lines 238, 240, 241, 242, 243). This can be implemented by editing the function in the relevant code block in packages/components/nodes/agentflow/Tool/Tool.ts, on lines 237-244.No new dependencies are needed.
Suggested fixes powered by Copilot Autofix. Review carefully before merging.