VNX-367 – Time-of-check Time-of-use (TOCTOU) Race Condition

Overview

VNX-367 maps to CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition. Detects source patterns associated with CWE-367 (Time-of-check Time-of-use (TOCTOU) Race Condition). Each finding should be manually reviewed for exploitability in context.

Severity: Medium | CWE: CWE-367 | Languages: c, cpp

Why This Matters

This weakness class (Time-of-check Time-of-use (TOCTOU) Race Condition) creates a concrete exploit surface: the rule searches for the concrete source-level patterns most commonly associated with CWE-367 and surfaces them for review. Each finding should be evaluated in context — the rule catches the pattern, not the context.

What Gets Flagged

// FLAGGED: contains 'access(' pattern
access(

Remediation

  1. Review each flagged line and determine whether the pattern represents a real instance of CWE-367 or a false positive.
  2. Replace the flagged construct with a documented safe alternative appropriate to your language and framework.
  3. For confirmed false positives, add a # vulnetix-ignore: VNX-367 comment on the line.
  4. Ensure equivalent test coverage exists to prevent regression.

References