🛡️ Sentinel: [HIGH] Fix unanchored regex in tweet verification#86
🛡️ Sentinel: [HIGH] Fix unanchored regex in tweet verification#86Dexploarer wants to merge 1 commit intomainfrom
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Replace vulnerable regex with strict `URL` parsing in `parseTweetUrl` to prevent acceptance of spoofed URLs. Adds comprehensive test coverage in `src/api/twitter-verify.test.ts`.
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Summary of ChangesHello @Dexploarer, 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 significantly enhances the security of tweet URL validation by resolving a high-severity vulnerability. The previous regex-based approach was susceptible to bypasses due to being unanchored. The updated implementation now leverages the Highlights
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| const match = parsed.pathname.match(/^\/(\w+)\/status\/(\d+)$/); | ||
| if (!match) return null; |
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The regular expression used to extract the screen name and tweet ID from the tweet URL is too restrictive. It only matches URLs of the form /username/status/1234567890 with no trailing slash, query parameters, or fragments. However, real-world tweet URLs often include trailing slashes, query parameters (e.g., ?s=20), or fragments, which will cause this function to return null for otherwise valid URLs.
Recommended solution:
Update the regex to allow for optional trailing slashes and ignore query parameters/fragments. For example:
const match = parsed.pathname.match(/^\/(\w+)\/status\/(\d+)(?:\/)?$/);Or, better yet, split the pathname and extract the relevant segments, ignoring any extra path components or trailing slashes. This will make the function more robust and user-friendly.
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Code Review
This pull request effectively addresses a high-severity security vulnerability related to an unanchored regex for tweet URL validation. The fix is robust, using the native URL API for parsing and implementing strict checks on both the hostname and pathname. The addition of comprehensive unit tests is excellent and ensures the vulnerability is resolved and won't regress. I have one minor suggestion to improve performance and code style by refactoring the list of valid hosts.
| const validHosts = ["twitter.com", "www.twitter.com", "x.com", "www.x.com"]; | ||
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| if (!validHosts.includes(hostname)) { | ||
| return null; | ||
| } |
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For better performance and to adhere to best practices, it's recommended to define validHosts as a constant outside the parseTweetUrl function. This prevents the array from being recreated on every function call. Additionally, using a Set for validHosts provides a more performant lookup (O(1)) compared to an array's includes method (O(n)).
| const validHosts = ["twitter.com", "www.twitter.com", "x.com", "www.x.com"]; | |
| if (!validHosts.includes(hostname)) { | |
| return null; | |
| } | |
| const validHosts = new Set(["twitter.com", "www.twitter.com", "x.com", "www.x.com"]); | |
| if (!validHosts.has(hostname)) { | |
| return null; | |
| } |
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Vulnerability: The regex used to validate tweet URLs (
/(?:twitter\.com|x\.com)\/(\w+)\/status\/(\d+)/) was unanchored, allowing URLs likehttps://evil.com/twitter.com/user/status/123to bypass validation.Fix:
new URL()parsing.twitter.com,x.com, andwwwvariants).^/(\w+)/status/(\d+)$.parseTweetUrlfor testing.src/api/twitter-verify.test.tscovering valid and invalid cases.Verification:
bun test src/api/twitter-verify.test.tswhich confirmed that the new implementation correctly rejects the exploit vector.PR created automatically by Jules for task 12309087947173640439 started by @Dexploarer