fix: Refactor `isURL()` to use Built-in `URL` Constructor by lahirumaramba · Pull Request #3061 · firebase/firebase-admin-node
Summary of Changes
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This pull request implements a crucial security enhancement by addressing a potential ReDoS vulnerability in the isURL validator. The core change involves refining the regular expression responsible for hostname validation, making it more resilient against malicious inputs that could lead to excessive processing time. Complementary to this fix, a comprehensive suite of new tests has been introduced to rigorously verify the updated validator's behavior under various conditions, including long and complex URLs, ensuring both security and performance.
Highlights
- ReDoS Vulnerability Fix: The regular expression used for hostname validation within the
isURLutility function has been updated to prevent a potential Regular Expression Denial of Service (ReDoS) vulnerability. The change removes an optional group that could lead to excessive backtracking. - Enhanced URL Validation Tests: New test cases have been added to the
isURLfunction's test suite. These tests specifically target ReDoS scenarios, ensuring the validator handles long valid and invalid URLs efficiently, and verifies the strict validation of dot usage in hostnames.
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Changelog
- src/utils/validator.ts
- Updated the hostname validation regular expression within the
isURLfunction to prevent a potential ReDoS vulnerability by modifying the([.]?[a-zA-Z0-9]+[\w-]*)*$part to(\.[a-zA-Z0-9]+[\w-]*)*$.
- Updated the hostname validation regular expression within the
- test/unit/utils/validator.spec.ts
- Added a new test suite for
isURLfocusing on ReDoS and long input scenarios. - Introduced tests to ensure quick handling of long valid URLs and long invalid URLs (ReDoS check) within a specified timeout.
- Included a test to verify the correct rejection of invalid dot patterns in hostnames, such as 'a..b'.
- Added a new test suite for
Activity
- The pull request was created by lahirumaramba.
- No human activity (comments, reviews, approvals) has been recorded yet.
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