UNIX Symbolic Link (Symlink) Following

Summary

Plexis Archiver is a collection of Plexus components to create archives or extract archives to a directory with a unified `Archiver`/`UnArchiver` API. In versions prior to 4.8.0, using "AbstractUnArchiver" for extracting an archive might lead to arbitrary file creation and possibly remote code execution. When extracting an archive with an entry that already exists in the destination directory as a symbolic link whose target does not exist - the `resolveFile()` function will return the symlink's source instead of its target, which will pass the verification that ensures the file will not be extracted outside of the destination directory. Later `Files.newOutputStream()`, which follows symlinks by default, will actually write the entry's content to the symlink's target.