sepehr
8d95f34fcc
- Add debounced state updates for title and content (500ms delay) - Immediate UI updates with delayed history saving - Prevent one-letter-per-undo issue - Add cleanup for debounce timers on unmount
79 lines
4.6 KiB
Markdown
79 lines
4.6 KiB
Markdown
## Threat Model for qs (querystring parsing library)
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### 1. Library Overview
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- **Library Name:** qs
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- **Brief Description:** A JavaScript library for parsing and stringifying URL query strings, supporting nested objects and arrays. It is widely used in Node.js and web applications for processing query parameters[2][6][8].
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- **Key Public APIs/Functions:** `qs.parse()`, `qs.stringify()`
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### 2. Define Scope
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This threat model focuses on the core parsing and stringifying functionality, specifically the handling of nested objects and arrays, option validation, and cycle management in stringification.
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### 3. Conceptual System Diagram
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```
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Caller Application → qs.parse(input, options) → Parsing Engine → Output Object
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│
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└→ Options Handling
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Caller Application → qs.stringify(obj, options) → Stringifying Engine → Output String
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│
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└→ Options Handling
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└→ Cycle Tracking
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```
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**Trust Boundaries:**
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- **Input string (parse):** May come from untrusted sources (e.g., user input, network requests)
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- **Input object (stringify):** May contain cycles, which can lead to infinite loops during stringification
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- **Options:** Provided by the caller
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- **Cycle Tracking:** Used only during stringification to detect and handle circular references
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### 4. Identify Assets
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- **Integrity of parsed output:** Prevent malicious manipulation of the output object structure, especially ensuring builtins/globals are not modified as a result of parse[3][4][8].
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- **Confidentiality of processed data:** Avoid leaking sensitive information through errors or output.
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- **Availability/performance for host application:** Prevent crashes or resource exhaustion in the consuming application.
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- **Security of host application:** Prevent the library from being a vector for attacks (e.g., prototype pollution, DoS).
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- **Reputation of library:** Maintain trust by avoiding supply chain attacks and vulnerabilities[1].
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### 5. Identify Threats
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| Component / API / Interaction | S | T | R | I | D | E |
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|---------------------------------------|----|----|----|----|----|----|
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| Public API Call (`parse`) | – | ✓ | – | ✓ | ✓ | ✓ |
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| Public API Call (`stringify`) | – | ✓ | – | ✓ | ✓ | – |
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| Options Handling | ✓ | ✓ | – | ✓ | – | ✓ |
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| Dependency Interaction | – | – | – | – | ✓ | – |
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**Key Threats:**
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- **Tampering:** Malicious input can, if not prevented, alter parsed output (e.g., prototype pollution via `__proto__`, modification of builtins/globals)[3][4][8].
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- **Information Disclosure:** Error messages may expose internal details or sensitive data.
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- **Denial of Service:** Large or malformed input can exhaust memory or CPU.
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- **Elevation of Privilege:** Prototype pollution can lead to unintended privilege escalation in the host application[3][4][8].
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### 6. Mitigation/Countermeasures
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| Threat Identified | Proposed Mitigation |
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|---------------------------------------------------|---------------------|
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| Tampering (malicious input, prototype pollution) | Strict input validation; keep `allowPrototypes: false` by default; use `plainObjects` for output; ensure builtins/globals are never modified by parse[4][8]. |
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| Information Disclosure (error messages) | Generic error messages without stack traces or internal paths. |
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| Denial of Service (memory/CPU exhaustion) | Enforce `arrayLimit` and `parameterLimit` with safe defaults; enable `throwOnLimitExceeded`; limit nesting depth[7]. |
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| Elevation of Privilege (prototype pollution) | Keep `allowPrototypes: false`; validate options against allowlist; use `plainObjects` to avoid prototype pollution[4][8]. |
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### 7. Risk Ranking
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- **High:** Denial of Service via array parsing or malformed input (historical vulnerability)
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- **Medium:** Prototype pollution via options or input (if `allowPrototypes` enabled)
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- **Low:** Information disclosure in errors
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### 8. Next Steps & Review
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1. **Audit option validation logic.**
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2. **Add depth limiting to nested parsing and stringification.**
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3. **Implement fuzz testing for parser and stringifier edge cases.**
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4. **Regularly review dependencies for vulnerabilities.**
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5. **Keep documentation and threat model up to date.**
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6. **Ensure builtins/globals are never modified as a result of parse.**
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7. **Support round-trip consistency between parse and stringify as a non-security goal, with the right options[5][9].**
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