CVE-2022-2396 in Simple e-Learning System
Summary
by MITRE • 07/14/2022
A vulnerability classified as problematic was found in SourceCodester Simple e-Learning System 1.0. Affected by this vulnerability is an unknown functionality of the file /vcs/claire_blake. The manipulation of the argument Bio with the input ">alert(document.cookie) leads to cross site scripting. The attack can be launched remotely. The exploit has been disclosed to the public and may be used.
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Analysis
by VulDB Data Team • 07/23/2022
This vulnerability represents a critical cross site scripting flaw in the SourceCodester Simple e-Learning System version 1.0 that allows remote attackers to execute malicious scripts in the context of victim browsers. The vulnerability specifically affects the /vcs/claire_blake file where user input is improperly handled, creating an entry point for malicious code injection. The exploit demonstrates the classic XSS attack pattern where an attacker can inject JavaScript code through the Bio parameter, with the payload ">alert(document.cookie) serving as a proof of concept that reveals the system's susceptibility to client-side code execution. The vulnerability is classified as remotely exploitable, meaning attackers can leverage this flaw without requiring physical access to the target system or network.
The technical implementation of this vulnerability stems from inadequate input validation and output sanitization within the application's data handling mechanisms. When user-provided data flows through the Bio parameter without proper encoding or filtering, it becomes susceptible to injection attacks. This type of vulnerability directly maps to CWE-79, which defines Cross-Site Scripting as a weakness where untrusted data is incorporated into web page content without proper validation or encoding. The flaw demonstrates poor secure coding practices that fail to distinguish between trusted and untrusted data inputs, allowing malicious payloads to be executed in the context of legitimate user sessions.
The operational impact of this vulnerability extends beyond simple script execution, as it provides attackers with the ability to access sensitive session information, steal cookies, and potentially hijack user sessions. The disclosure of document.cookie through the alert function reveals that attackers can access and exfiltrate authentication tokens or session identifiers that would otherwise remain protected. This vulnerability creates opportunities for session hijacking, credential theft, and further escalation attacks within the targeted environment. The remote exploit capability means that attackers can target users from any location without requiring local network access, making this vulnerability particularly dangerous in web-based applications.
Security professionals should implement comprehensive input validation and output encoding mechanisms to prevent similar vulnerabilities from occurring in the future. The recommended mitigations include implementing proper content security policies, sanitizing all user inputs before processing, and employing secure coding practices that follow OWASP Top Ten guidelines. Organizations should also consider implementing web application firewalls to detect and block malicious payloads, while conducting regular security assessments to identify and remediate similar vulnerabilities in their web applications. The disclosure of this exploit highlights the importance of timely patch management and vulnerability disclosure practices that help protect users from known security flaws. This vulnerability serves as a reminder of the critical need for robust application security measures and proper input handling in modern web applications.