Project: WASC Threat Classification

Threat Type: Weakness

Reference ID: WASC-17


Improper Filesystem Permissions

Improper filesystem permissions are a threat to the confidentiality, integrity and availability of a web application. The problem arises when incorrect filesystem permissions are set on files, folders, and symbolic links. When improper permissions are set, an attacker may be able to access restricted files or directories and modify or delete their contents. For example, if an anonymous user account has write permission to a file, then an attacker may be able to modify the contents of the file influencing the web application in undesirable ways. An attacker may also exploit improper symlinks to escalate their privileges and/or access unauthorized files; for example, a symlink that points to a directory outside of the web root.