🛡️ Sentinel: [CRITICAL/HIGH] Fix prototype pollution in Lua labels#44
🛡️ Sentinel: [CRITICAL/HIGH] Fix prototype pollution in Lua labels#44ericbfriday wants to merge 1 commit into
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Severity: HIGH
Vulnerability: Using object literals `{}` to store user-supplied string keys (like Lua labels) allows prototype pollution if a user uses keys like `__proto__`.
Impact: An attacker or script processing untrusted inputs could manipulate or pollute the parser's environment.
Fix: Used a secure initialization like `Object.create ? Object.create(null) : {}` for dictionaries to prevent prototype pollution while providing a fallback.
Verification: Code review verified fix and test suite passes.
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Pull request overview
This PR addresses a prototype-pollution risk in Lua label tracking by changing the internal label dictionary to use a null-prototype object, and adds a Sentinel note documenting the vulnerability pattern.
Changes:
- Initializes
FullFlowContextlabel storage withObject.create(null). - Adds
.jules/sentinel.mdguidance about avoiding prototype-backed dictionaries for user-controlled keys.
Reviewed changes
Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.
| File | Description |
|---|---|
luaparse.js |
Updates label-scope dictionary initialization for safer user-controlled label keys. |
.jules/sentinel.md |
Documents the prototype pollution vulnerability and prevention guidance. |
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| FullFlowContext.prototype.pushScope = function (isLoop) { | ||
| var scope = { | ||
| labels: {}, | ||
| labels: Object.create ? Object.create(null) : {}, |
| FullFlowContext.prototype.pushScope = function (isLoop) { | ||
| var scope = { | ||
| labels: {}, | ||
| labels: Object.create ? Object.create(null) : {}, |
| ## 2024-05-24 - Prototype Pollution in Lua Labels | ||
| **Vulnerability:** Using object literals `{}` to store user-supplied string keys (like Lua labels) allows prototype pollution if a user uses keys like `__proto__`. | ||
| **Learning:** Dictionary objects storing arbitrary user input should not inherit from `Object.prototype`. | ||
| **Prevention:** Use a secure initialization like `Object.create ? Object.create(null) : {}` for dictionaries to prevent prototype pollution while providing a fallback. |
🚨 Severity: HIGH
💡 Vulnerability: Using object literals
{}to store user-supplied string keys (like Lua labels) allows prototype pollution if a user uses keys like__proto__.🎯 Impact: An attacker or script processing untrusted inputs could manipulate or pollute the parser's environment.
🔧 Fix: Used a secure initialization like
Object.create ? Object.create(null) : {}for dictionaries to prevent prototype pollution while providing a fallback.✅ Verification: Code review verified fix and all tests run smoothly without regressions.
PR created automatically by Jules for task 14786177567990790542 started by @ericbfriday