CVE-2018-5688 in ILIAS
Summary
by MITRE
ILIAS before 5.2.4 has XSS via the cmd parameter to the displayHeader function in setup/classes/class.ilSetupGUI.php in the Setup component.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 05/29/2025
The vulnerability identified as CVE-2018-5688 represents a cross-site scripting flaw within the ILIAS learning management system that affects versions prior to 5.2.4. This security weakness resides in the setup component of the application where user input is not properly sanitized before being rendered in web pages. The vulnerability specifically impacts the displayHeader function located in setup/classes/class.ilSetupGUI.php, making it possible for attackers to inject malicious scripts into the application's user interface through the cmd parameter.
The technical nature of this vulnerability aligns with CWE-79 which categorizes cross-site scripting flaws as weaknesses that occur when an application includes untrusted data in web pages without proper validation or escaping. The flaw exists because the cmd parameter passed to the displayHeader function does not undergo adequate input sanitization or output encoding before being incorporated into the HTML response. This creates an opportunity for malicious actors to execute arbitrary JavaScript code within the context of other users' browsers who visit affected pages.
The operational impact of this vulnerability is significant as it allows attackers to perform various malicious activities through the compromised session. An attacker could potentially steal session cookies, redirect users to malicious websites, deface the application interface, or even escalate privileges within the system. The vulnerability's location within the setup component suggests it may be exploitable during initial system configuration or maintenance activities when administrators are actively working with the application. This makes it particularly dangerous as it could be leveraged during critical system administration tasks when users might be less vigilant about unusual behavior.
The attack vector for this vulnerability typically involves an attacker constructing a malicious URL containing crafted JavaScript code within the cmd parameter and delivering it to a victim who is logged into the ILIAS system. When the victim visits the crafted page, the malicious script executes in their browser context, potentially leading to unauthorized actions or data theft. This vulnerability demonstrates the importance of implementing proper input validation and output encoding practices throughout all application components, particularly in administrative interfaces where elevated privileges may be available.
Organizations using affected versions of ILIAS should immediately upgrade to version 5.2.4 or later to remediate this vulnerability. Additionally, implementing proper parameter validation, input sanitization, and output encoding measures can provide defense-in-depth protection against similar issues. Security teams should also consider monitoring for suspicious user activities and implementing web application firewalls to detect and block malicious payloads targeting such vulnerabilities. The ATT&CK framework categorizes this type of vulnerability under T1203 - Exploitation for Client Execution, highlighting the need for comprehensive application security controls.