Описание
Smarty: Symlink path traversal out of trusted directories
When Smarty's Security policy is enabled, secure_dir (and the configured template/trusted directories) restrict which local files a template may read via {include} and {fetch}. The trust check in Security::_checkDir() resolved the requested path with Smarty::_realpath(), which normalizes the path as a string only and does not follow symbolic links. A symlink placed inside a trusted directory therefore passed the trust check, while the underlying file_get_contents() followed it to an arbitrary file outside the sandbox (e.g. /etc/passwd).
Impact
An attacker able to (a) cause a symlink to exist inside a trusted directory (e.g. a user-upload area located within the template path) and (b) cause a template to reference that path can read arbitrary files readable by the PHP process, escaping the secure_dir boundary. Confidentiality impact only.
Patches
Fixed in 5.8.2. Security::_checkDir() now resolves the requested file with native realpath() and re-validates the canonical, symlink-free path against the trusted directories (which are canonicalized the same way, so legitimate symlinked deployment paths such as a Capistrano current symlink or macOS /var → /private/var keep working). It falls back to string normalization only when the file does not yet exist on disk.
Workarounds
Ensure no untrusted symlinks can be created within any directory listed in secure_dir/the trusted template directories; restrict write access to those directories to trusted processes only.
References
- Fix commit: 99c048c
- CWE-22
Ссылки
- https://github.com/smarty-php/smarty/security/advisories/GHSA-f6wf-28g6-769x
- https://github.com/smarty-php/smarty/commit/99c048ce7a590c519b79fbd38ad0143a08183a1f
- https://github.com/smarty-php/smarty/commit/a1ccdb0518021a559b4066c37b76a42c86bbce90
- https://github.com/smarty-php/smarty/releases/tag/v4.5.7
- https://github.com/smarty-php/smarty/releases/tag/v5.8.2
Пакеты
smarty/smarty
>= 5.0.0, < 5.8.2
5.8.2
smarty/smarty
< 4.5.7
4.5.7
Связанные уязвимости
Smarty is a template engine for PHP, facilitating the separation of presentation (HTML/CSS) from application logic. Prior to 5.8.2 (and 4.5.7 on the 4.x line), Security::_checkDir() does not fully resolve symbolic links before validating that a requested path lies within a configured secure directory. An attacker able to place or reference a symlink within a directory Smarty treats as trusted (e.g., a template or config directory) could use it to point outside the intended secure directory, bypassing the containment check and reading arbitrary files accessible to the PHP process. This issue is fixed in versions 5.8.2 and 4.5.7.
Smarty is a template engine for PHP, facilitating the separation of pr ...