detecting-race-conditions
Detects race condition vulnerabilities including TOCTOU, double-checked locking issues, and shared state problems. Use when analyzing concurrent operations, file access patterns, or investigating timing-related vulnerabilities.
When & Why to Use This Skill
This Claude skill is a specialized security analysis tool designed to identify and mitigate race condition vulnerabilities in software. It performs deep inspections of concurrent operations, file access patterns, and shared state management to detect critical flaws such as Time-of-Check to Time-of-Use (TOCTOU), improper double-checked locking, and non-atomic operations. By tracing execution paths and evaluating synchronization primitives, it helps developers ensure thread safety and prevent timing-related exploits in high-concurrency environments.
Use Cases
- Security Auditing: Identifying TOCTOU vulnerabilities in file system operations to prevent unauthorized privilege escalation or file access bypass.
- Concurrency Debugging: Analyzing multi-threaded applications to locate unprotected shared variables and non-atomic operations that lead to intermittent data corruption.
- Automated Code Review: Verifying the implementation of locks and synchronization primitives to ensure they correctly protect critical sections and follow proper lock ordering.
- Vulnerability Assessment: Evaluating the exploitability of timing-related bugs by analyzing race windows and potential attack vectors in complex system architectures.
| name | detecting-race-conditions |
|---|---|
| description | Detects race condition vulnerabilities including TOCTOU, double-checked locking issues, and shared state problems. Use when analyzing concurrent operations, file access patterns, or investigating timing-related vulnerabilities. |
Race Condition Detection
Detection Workflow
- Identify critical operations: Find file access sequences (check then use), shared state access patterns, synchronization primitives
- Trace execution paths: Use
xrefs_toto identify potential interleaving points and race windows - Check synchronization: Verify locks protect critical sections, check for atomic operations, assess lock ordering
- Assess exploitability: Can attacker control timing? Is there a useful race window? What's the impact?
Key Patterns
- TOCTOU (Time-of-Check to Time-of-Use)
- Double-checked locking issues
- Unprotected shared variables
- Non-atomic operations on shared data
- Signal handler issues
Output Format
Report with: id, type, subtype, severity, confidence, location, vulnerability, check operation, use operation, race window, exploitability, attack scenario, impact, mitigation.
Severity Guidelines
- CRITICAL: Race allowing privilege escalation
- HIGH: Race allowing file access bypass
- MEDIUM: Race causing data corruption
- LOW: Race with minor impact
See Also
patterns.md- Detailed detection patterns and exploitation scenariosexamples.md- Example analysis cases and code samplesreferences.md- CWE references and mitigation strategies