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CVE-2020-13381 describes multiple unpatched SQL injection vulnerabilities in openSIS version 7.4 and prior. The vulnerabilities affect parameters such as event_id in /CalendarModal.php, course_id in /modules/scheduling/MassSchedule.php, and student in /modules/attendance/AddAbsences.php. In addition, unsafe use of the eval() function in /functions/DbGetFnc.php may allow arbitrary PHP code execution. These issues remain unpatched as of the last update, despite partial remediation in version 7.4 for other related vulnerabilities.
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This repository contains a single Metasploit module (modules/exploits/unix/webapp/opensis_chain_exec.rb) targeting openSIS versions 7.4 and below. The exploit leverages a chain of vulnerabilities (incorrect access control, local file inclusion, and SQL injection leading to unsafe eval usage) to achieve unauthenticated remote code execution. The module is written in Ruby and uses the Metasploit framework's HTTP client to interact with the target web application. The attack is performed in several steps: retrieving a session cookie, injecting a malicious SQL payload via /CpSessionSet.php/index.php, setting session variables via /ForExport.php/index.php, and finally executing arbitrary PHP code through /Bottom.php/index.php. The module supports arbitrary PHP payloads, making it weaponized and suitable for post-exploitation activities. The targeted CVEs are 2020-13381, 2020-13382, and 2020-13383. The exploit is operational and can be used to gain code execution as the webserver user on vulnerable openSIS installations.
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