Talos Vulnerability Report


OS4Ed openSIS DownloadWindow.php SQL injection vulnerability

August 31, 2020
CVE Number



An exploitable SQL injection vulnerability exists in the DownloadWindow.php functionality of OS4Ed openSIS 7.3. A specially crafted HTTP request can lead to SQL injection. An attacker can make an authenticated HTTP request to trigger this vulnerability.

Tested Versions

OS4Ed openSIS 7.3

Product URLs


CVSSv3 Score

6.4 - CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N


CWE-89 - Improper Neutralization of Special Elements used in an SQL Command (‘SQL Injection’)


openSIS is a student information system and school management system. It is available in commercial and open-source versions. It allows schools to create schedules and track attendance, grades and transcripts.

The down_id parameter in the download page DownloadWindow.php is vulnerable to SQL injection.

Below is an example request that will trigger the vulnerability:

GET /opensis/DownloadWindow.php?down_id=1[SQLINJECTION]&filename=1&name=1 HTTP/1.1
Host: [IP]
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:74.0) Gecko/20100101 Firefox/74.0
Accept: */*
Accept-Language: en-GB,en;q=0.5
Accept-Encoding: gzip, deflate
X-Requested-With: XMLHttpRequest
DNT: 1
Connection: close
Referer: http://[IP]/opensis/Modules.php?modname=schoolsetup/Schools.php&modfunc=update
Cookie: miniSidebar=0; PHPSESSID=6chg16qcanbg3adrqlq6sm6fa3

The vulnerable code for this parameter is at line 33:

 28 include('RedirectRootInc.php');
 29 include 'Warehouse.php';
 30 include 'Data.php';
 31 if(isset($_REQUEST['down_id']) && $_REQUEST['down_id']!='')
 32 {
 33     $downfile_info= DBGet(DBQuery('SELECT * FROM user_file_upload WHERE ID='.$_REQUEST['down_id'].''));
 34         header("Cache-Control: public");
 35         header("Pragma: ");
 36         header("Expires: 0");
 37         header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
 38         header("Cache-Control: private",false); // required for certain browse


2020-06-02 - Vendor Disclosure
2020-08-13 - Vendor provided patch to Talos for testing
2020-08-17 - Talos confirmed patch resolved issue
2020-08-31 - Public Release


Discovered by Yuri Kramarz of Cisco Talos.