openSIS 7.4 Local File Inclusion

`--------------------------------------------------------------  
openSIS <= 7.4 (Bottom.php) Local File Inclusion Vulnerability  
--------------------------------------------------------------  
  
  
[-] Software Link:  
  
https://opensis.com/  
  
  
[-] Affected Versions:  
  
Version 7.4 and prior versions.  
  
  
[-] Vulnerability Description:  
  
The vulnerable code is located in the /Bottom.php script:  
  
36. if(clean_param($_REQUEST['modfunc'],PARAM_ALPHA)=='print')  
37. {  
38. $_REQUEST = $_SESSION['_REQUEST_vars'];  
39. $_REQUEST['_openSIS_PDF'] = true;  
40. if(strpos($_REQUEST['modname'],'?')!==false)  
41. $modname =   
substr($_REQUEST['modname'],0,strpos($_REQUEST['modname'],'?'));  
42. else  
43. $modname = $_REQUEST['modname'];  
44. ob_start();  
45. include('modules/'.$modname);  
  
User input passed through the "modname" request parameter is not   
properly sanitized before being  
used in a call to the "include()" function at line 45. This can be   
exploited to include arbitrary  
local files and potentially access otherwise restricted functionalities   
or execute arbitrary PHP  
code with the permissions of the webserver.  
  
  
[-] Solution:  
  
No official solution is currently available.  
  
  
[-] Disclosure Timeline:  
  
[04/11/2019] - Vendor notified  
[04/11/2019] - Vendor acknowledgement  
[10/01/2020] - Vendor contacted again asking for updates  
[16/01/2020] - Vendor tried to fix the vulnerability by using   
"mysqli_real_escape_string()"  
[06/02/2020] - Vendor was informed about the inappropriate fix  
[25/04/2020] - Version 7.4 released, vulnerability still incorrectly   
fixed  
[22/05/2020] - CVE number assigned  
[30/06/2020] - Public disclosure  
  
  
[-] CVE Reference:  
  
The Common Vulnerabilities and Exposures project (cve.mitre.org)  
has assigned the name CVE-2020-13383 to this vulnerability.  
  
  
[-] Credits:  
  
Vulnerability discovered by Egidio Romano.  
  
  
[-] Original Advisory:  
  
http://karmainsecurity.com/KIS-2020-07  
  
  
`