CVE-2014-9430 in Smoothwall
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in httpd/cgi-bin/vpn.cgi/vpnconfig.dat in Smoothwall Express 3.0 SP3 allows remote attackers to inject arbitrary web script or HTML via the COMMENT parameter in an Add action.
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Analysis
by VulDB Data Team • 04/10/2022
The CVE-2014-9430 vulnerability represents a critical cross-site scripting flaw discovered in Smoothwall Express 3.0 SP3 firewall software, specifically within the httpd/cgi-bin/vpn.cgi component that handles vpnconfig.dat configuration files. This vulnerability exists in the web interface's handling of user input through the COMMENT parameter during Add actions, creating a persistent security weakness that enables remote attackers to execute malicious scripts in the context of authenticated users' browsers. The flaw resides in the improper sanitization of user-supplied data before it is rendered back to web clients, making it a classic example of insecure input handling that violates fundamental web security principles.
The technical implementation of this vulnerability demonstrates a clear failure in output encoding and input validation mechanisms within the Smoothwall firewall's web administration interface. When administrators or users submit configuration data through the VPN management interface, the COMMENT parameter is not adequately sanitized or escaped before being stored and subsequently displayed in the web interface. This creates an environment where malicious actors can inject HTML tags, JavaScript code, or other malicious payloads that will execute when other users view the affected configuration data. The vulnerability specifically affects the Add action within the VPN configuration management, where the COMMENT field serves as the attack vector for XSS exploitation. This flaw aligns with CWE-79 which categorizes cross-site scripting vulnerabilities as weaknesses in input validation and output encoding, and represents a direct violation of the principle of least privilege in web application security.
The operational impact of CVE-2014-9430 extends beyond simple script injection, as it provides attackers with the capability to establish persistent footholds within the network infrastructure managed by Smoothwall Express. An attacker who successfully exploits this vulnerability can execute arbitrary code in the browser context of authenticated users, potentially leading to session hijacking, credential theft, or redirection to malicious sites. The vulnerability affects the administrative interface of the firewall, which means that successful exploitation could allow attackers to gain unauthorized access to critical network security configurations, potentially enabling them to modify firewall rules, access sensitive network data, or establish backdoor access points. This makes the vulnerability particularly dangerous in enterprise environments where Smoothwall Express serves as a primary network security gateway. The attack can be executed remotely without requiring authentication to the system itself, making it especially concerning for organizations with limited network segmentation.
Mitigation strategies for CVE-2014-9430 should focus on immediate patching of the Smoothwall Express 3.0 SP3 software to the latest available version that contains proper input validation and output encoding fixes. Organizations should implement comprehensive input sanitization measures that validate and escape all user-supplied data before it is processed or stored in configuration files. The implementation of Content Security Policy headers can provide additional protection against XSS attacks by restricting the sources from which scripts can be loaded and executed. Network administrators should also consider implementing web application firewalls that can detect and block malicious payloads attempting to exploit XSS vulnerabilities. Regular security audits and penetration testing should be conducted to identify similar input validation weaknesses in other network management interfaces. According to ATT&CK framework, this vulnerability maps to T1059.007 for script execution and T1566 for social engineering techniques, highlighting the need for both technical controls and user awareness training. Organizations should also consider implementing principle of least privilege for administrative interfaces and ensure that only necessary personnel have access to VPN configuration management functions to minimize potential attack surface.