I would like to report Path Traversal in simplehttpserver. It allows to list any file in another folder of web root.

Module

module name: simplehttpserverversion:v0.2.1npm page: https://www.npmjs.com/package/simplehttpserver

Module Description

‘simpehttpserver’ is an simple imitation of python’s SimpleHTTPServer and is intended for testing, development and debugging purposes

Module Stats

[319] downloads in the last week

Vulnerability

Vulnerability Description

simpehttpserver is simply get the path name of url and add it to the web root.If there is a symlink file in the directory. You can access files outside the web root directory.

Steps To Reproduce:

create symlink file
$ ln -s …/…/ symdir

install simplehttpserver
$ npm install simplehttpserver -g

start program
$ simplehttpserver ./

{F340863}

Patch

Disable symlink file access in webserver.

Supporting Material/References:

Configuration I’ve used to find this vulnerability:

macos 10.13.6
nodejs v10.9.0
npm 6.4.1
chrome 68.0.3440.106

Wrap up

• I contacted the maintainer to let them know: [N]
• I opened an issue in the related repository: [N]

Impact

This vulnerability allows malicious user to list file in the folder. This might expose vectors to attack system with Remote Code Execution, reveals files with usernames and passwords and many other possibilites.