Description
Copier is a library and CLI app for rendering project templates. Prior to version 9.11.2, Copier suggests that it's safe to generate a project from a safe template, i.e. one that doesn't use unsafe features like custom Jinja extensions which would require passing the `--UNSAFE,--trust` flag. As it turns out, a safe template can currently include arbitrary files/directories outside the local template clone location by using symlinks along with `_preserve_symlinks: false` (which is Copier's default setting). Version 9.11.2 patches the issue.
Problem types
CWE-61: UNIX Symbolic Link (Symlink) Following
Product status
References
github.com/...copier/security/advisories/GHSA-xjhm-gp88-8pfx
github.com/...ommit/b3a7b3772d17cf0e7a4481978188c9f536c8d8f6