insecure-temp-files-anti-pattern

Insecure temporary file creation exposes three attack vectors: predictable file names enabling symlink attacks, insecure permissions allowing unauthorized access, and missing cleanup leaving sensitive data on disk. Attackers exploit these to read sensitive data, inject malicious content, or cause denial of service. AI-generated code frequently suggests simplistic file handling vulnerable to these attacks.

Never create temporary files without securing their location, naming, permissions, and lifecycle management.

Using a predictable name for a temporary file creates a race condition. An attacker can guess the file name and create a symbolic link (symlink) at that location pointing to a sensitive system file. When the application writes to its "temporary" file, it is actually overwriting the linked file.

Anti-modèle de sécurité pour les fichiers temporaires non sécurisés (CWE-377). À utiliser lors de la génération ou de la révision de code qui crée des fichiers temporaires, gère la mise en cache des fichiers ou traite les téléchargements via le stockage temporaire. Détecte les chemins prévisibles, les autorisations non sécurisées et les nettoyages manquants. Source : igbuend/grimbard.