CVE-2013-7181 in FortiWeb
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in user/ldap_user/add in Fortinet FortiOS 5.0.3 allows remote attackers to inject arbitrary web script or HTML via the filter parameter.
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Analysis
by VulDB Data Team • 04/22/2025
The vulnerability identified as CVE-2013-7181 represents a critical cross-site scripting flaw within the Fortinet FortiOS 5.0.3 web interface, specifically affecting the user/ldap_user/add endpoint. This weakness resides in the application's handling of user input within the filter parameter, creating an avenue for malicious actors to execute arbitrary web scripts or HTML code within the context of other users' browsers. The vulnerability impacts the authentication and user management functionality of the Fortinet firewall appliance, which operates as a comprehensive network security solution. The flaw stems from insufficient input validation and output encoding mechanisms within the web administration interface, allowing attackers to inject malicious payloads that persist in the system's user management components. This particular endpoint is designed to facilitate the addition of LDAP users to the FortiOS system, making it a prime target for attackers seeking to compromise user sessions or escalate privileges within the security infrastructure.
The technical exploitation of this vulnerability follows established XSS attack patterns where the filter parameter fails to properly sanitize user-supplied input before rendering it in the web interface. When an attacker submits malicious content through this parameter, the system processes the input without adequate validation, subsequently displaying the crafted payload in the user interface. This allows for the execution of JavaScript code in the victim's browser context, potentially enabling session hijacking, credential theft, or redirection to malicious sites. The vulnerability is classified as a classic reflected XSS issue under CWE-79, which specifically addresses the failure to properly encode output data, and aligns with ATT&CK technique T1059.007 for the execution of malicious code through web interfaces. The attack vector requires remote access to the FortiOS web administration interface, typically through HTTP or HTTPS connections, and can be executed without authentication in many scenarios due to the nature of the web-based interface.
The operational impact of this vulnerability extends beyond simple script injection, as it compromises the integrity of the FortiOS user management system and potentially the entire network security infrastructure. An attacker could leverage this vulnerability to establish persistent access to the firewall's administrative interface, modify user permissions, or inject backdoor accounts that could persist across system reboots. The vulnerability affects the authentication and authorization mechanisms of the Fortinet appliance, potentially allowing attackers to escalate privileges and gain deeper access to network resources. Organizations relying on FortiOS for network security may experience significant operational disruption if attackers exploit this vulnerability to manipulate user accounts or gain unauthorized access to critical network controls. The impact is particularly severe in environments where FortiOS serves as a primary security gateway, as compromised user management functionality could lead to complete network infiltration and data exfiltration.
Mitigation strategies for CVE-2013-7181 should focus on immediate patching and input validation improvements. Fortinet released security updates addressing this vulnerability in subsequent FortiOS versions, and organizations must apply these patches immediately to eliminate the risk. Network administrators should implement additional security controls including web application firewalls that can detect and block malicious payloads targeting XSS vulnerabilities in the web interface. Input validation should be strengthened to reject potentially dangerous characters and patterns in the filter parameter, while output encoding should be implemented to prevent script execution in the browser context. Security monitoring should include detection of suspicious user interface interactions and unusual parameter values that might indicate attempted exploitation. Organizations should also consider implementing network segmentation to limit access to the FortiOS administration interface, restrict access based on IP addresses, and enforce strong authentication mechanisms including multi-factor authentication. Regular security assessments and vulnerability scanning should be conducted to identify similar issues in other web applications within the network infrastructure, as this vulnerability demonstrates the importance of proper input sanitization and output encoding practices in security-critical applications.