CVE-2013-3601 in Coursemill Learning Management System
Summary
by MITRE
Coursemill Learning Management System (LMS) 6.6 does not properly restrict JSP function calls, which allows remote authenticated users to perform arbitrary JSP operations by leveraging the Student role and providing an op parameter.
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Analysis
by VulDB Data Team • 08/15/2024
The Coursemill Learning Management System version 6.6 contains a critical security flaw that stems from improper input validation and privilege escalation mechanisms within its web application framework. This vulnerability specifically affects the system's handling of JSP function calls, creating a pathway for authenticated attackers to execute arbitrary code on the server. The flaw is particularly concerning because it can be exploited by users holding the Student role, which typically should have limited access to system functions. The vulnerability manifests through the improper restriction of JSP operations when processing an op parameter, allowing maliciously crafted requests to bypass normal access controls and execute unauthorized operations.
The technical implementation of this vulnerability resides in the application's parameter handling logic within the JSP processing layer. When the system receives an op parameter through user input, it fails to properly validate or sanitize the input before executing corresponding JSP functions. This lack of input filtering creates a direct path for code injection attacks where an authenticated student can manipulate the parameter to trigger unauthorized JSP operations. The vulnerability demonstrates poor secure coding practices and violates fundamental security principles of input validation and privilege separation. According to CWE guidelines, this represents a weakness in input validation and improper restriction of operations within a software system, specifically categorized under CWE-20 for improper input validation and CWE-79 for cross-site scripting vulnerabilities.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it allows for complete system compromise when exploited by a malicious student user. An attacker with student credentials can leverage this flaw to execute arbitrary JSP code, potentially leading to data theft, system modification, or even complete server takeover. The vulnerability creates a persistent backdoor that can be used for ongoing unauthorized access to the learning management system's resources. The attack surface is particularly dangerous because it requires minimal privileges to exploit, making it an attractive target for attackers who may have gained student-level access through legitimate means or social engineering. This vulnerability also enables potential lateral movement within the network if the LMS server has access to other systems or databases.
Mitigation strategies for this vulnerability must address both immediate remediation and long-term architectural improvements. The most critical immediate action is to implement proper input validation and parameter sanitization for all JSP operations, ensuring that the op parameter cannot be manipulated to execute unauthorized functions. Organizations should apply the vendor-provided patch or upgrade to a version that resolves this vulnerability. Implementing proper access controls and role-based permissions is essential, ensuring that student users cannot access administrative functions through parameter manipulation. Network segmentation and monitoring should be enhanced to detect suspicious JSP activity patterns. According to ATT&CK framework, this vulnerability aligns with techniques such as privilege escalation and code injection, making it important to implement defensive measures against these attack patterns. The vulnerability also highlights the need for comprehensive security testing including input validation checks and privilege verification procedures. Organizations should conduct regular security assessments to identify similar weaknesses in their LMS implementations and other web applications. Additionally, implementing web application firewalls and logging mechanisms can help detect and prevent exploitation attempts. The remediation process should include thorough code review to identify other potential parameter handling vulnerabilities and establish secure coding practices that prevent similar issues in future development cycles.