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openSIS 7.4 Local File Inclusion

openSIS 7.4 Local File Inclusion
Posted Jun 30, 2020
Authored by EgiX | Site karmainsecurity.com

openSIS versions 7.4 and below suffer from a local file inclusion vulnerability.

tags | exploit, local, file inclusion
advisories | CVE-2020-13383
SHA-256 | e7161d7a2b2b5f3b74f9ce9373cde1c623bb264344142c67862680b20c2bfee5

openSIS 7.4 Local File Inclusion

Change Mirror Download
--------------------------------------------------------------
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


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