The remote Debian host is missing a security-related update.
Enrico Zini discovered a vulnerability in Syntastic, an addon module for the Vim editor that runs a file through external checkers and displays any resulting errors. Config files were looked up in the current working directory which could result in arbitrary shell code execution if a malformed source code file is opened.
Upgrade the vim-syntastic packages. For the stable distribution (stretch), this problem has been fixed in version 3.7.0-1+deb9u2.