CVE-2011-4887 in SecureSphere Web Application Firewall
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in the Violations Table in the management GUI in the MX Management Server in Imperva SecureSphere Web Application Firewall (WAF) 9.0 allows remote attackers to inject arbitrary web script or HTML via the username field.
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Analysis
by VulDB Data Team • 03/19/2018
The CVE-2011-4887 vulnerability represents a critical cross-site scripting flaw within the Imperva SecureSphere Web Application Firewall's management interface. This vulnerability specifically targets the Violations Table component of the MX Management Server, which serves as the administrative portal for configuring and monitoring the WAF's security policies. The flaw exists in version 9.0 of the SecureSphere product, making it a significant concern for organizations relying on this particular version of the web application firewall solution. The vulnerability's presence in the management GUI creates a particularly dangerous scenario since administrative interfaces typically contain sensitive configuration data and control mechanisms that could be exploited by malicious actors.
The technical implementation of this vulnerability stems from insufficient input validation and output encoding within the username field processing of the Violations Table functionality. When a user submits data through the username field, the application fails to properly sanitize or escape the input before rendering it in the web interface. This allows an attacker to inject malicious scripts or HTML content that gets executed in the context of other users' browsers who view the affected table. The vulnerability operates under the common weakness enumeration CWE-79 which specifically addresses cross-site scripting flaws where untrusted data is incorporated into web pages without proper validation or encoding. The flaw essentially permits attackers to execute arbitrary code within the browser of authenticated users, potentially leading to complete session hijacking or unauthorized administrative actions.
The operational impact of this vulnerability extends beyond simple script injection, creating substantial risks for organizations using Imperva SecureSphere 9.0. Attackers could leverage this vulnerability to steal administrative sessions, modify security policies, or gain unauthorized access to sensitive network configurations. The compromised management interface would allow threat actors to manipulate the WAF's core security functions, potentially disabling protection mechanisms or redirecting traffic through malicious endpoints. From an attacker's perspective, this represents a prime vector for privilege escalation attacks, as the management interface typically requires elevated privileges to access. The vulnerability's remote nature means attackers do not need physical access to the network or direct system compromise to exploit it, making it particularly dangerous for organizations with remote management capabilities.
Mitigation strategies for CVE-2011-4887 should focus on immediate patching of the affected SecureSphere 9.0 implementation, as this represents a critical security flaw requiring prompt attention. Organizations should implement additional input validation measures at the application level, ensuring all user-supplied data undergoes strict sanitization before being processed or displayed. The implementation of Content Security Policy headers can provide additional protection layers against script execution, while regular security assessments of administrative interfaces should be conducted to identify similar vulnerabilities. Network segmentation and access controls should be strengthened around the management interfaces to limit exposure, and monitoring systems should be configured to detect unusual activity patterns that might indicate exploitation attempts. From a defensive standpoint, this vulnerability aligns with ATT&CK technique T1071.004 which covers application layer protocol manipulation, and T1566 which addresses credential access through various attack vectors including web-based exploitation methods. Organizations should also consider implementing web application firewalls specifically designed to detect and prevent XSS attacks, as well as conducting regular security training for administrators to recognize potential exploitation attempts.