CVE-2013-6963 in WebEx Training Center
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in the registration component in Cisco WebEx Training Center allows remote attackers to inject arbitrary web script or HTML via a crafted URL, aka Bug ID CSCul36207.
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Analysis
by VulDB Data Team • 12/22/2024
The vulnerability identified as CVE-2013-6963 represents a critical cross-site scripting flaw within Cisco WebEx Training Center's registration component. This security weakness resides in the web application's handling of user-supplied input through URL parameters, creating an avenue for malicious actors to execute arbitrary web scripts or HTML code within the context of authenticated users' browsers. The vulnerability specifically affects the registration functionality of the WebEx Training Center platform, which is widely used for online training and web conferencing sessions.
The technical implementation of this XSS vulnerability stems from inadequate input validation and output encoding within the registration component. When users navigate to specially crafted URLs containing malicious script payloads, the application fails to properly sanitize or escape these inputs before rendering them in web pages. This insufficient sanitization allows attackers to inject JavaScript code or HTML elements that execute in the victim's browser context. The flaw operates at the application layer where user-provided data flows through the system without adequate security controls to prevent code injection attacks. According to CWE classification, this represents a CWE-79: Improper Neutralization of Input During Web Page Generation, which is a fundamental weakness in web application security.
The operational impact of this vulnerability extends beyond simple script execution, as it can enable attackers to perform a range of malicious activities within the compromised user sessions. Remote attackers could potentially steal session cookies, redirect users to phishing sites, deface web pages, or even escalate privileges within the application. The vulnerability is particularly concerning because it affects the registration component, which is likely accessed by numerous users during training enrollment processes. This creates a scalable attack vector where a single malicious URL could compromise multiple users simultaneously. The bug ID CSCul36207 indicates this was recognized as a significant security concern within Cisco's internal tracking systems, highlighting the potential for widespread impact.
Mitigation strategies for CVE-2013-6963 should focus on implementing robust input validation and output encoding mechanisms throughout the WebEx Training Center application. Organizations should deploy proper parameter validation to ensure that URL parameters containing user input are thoroughly sanitized before being processed or displayed. The implementation of Content Security Policy headers can provide an additional layer of protection against script execution. Security patches from Cisco should be applied immediately to address the root cause of the vulnerability. According to ATT&CK framework, this vulnerability maps to T1059.007: Command and Scripting Interpreter: JavaScript, which is relevant for threat actors seeking to establish persistent access through client-side attacks. Organizations should also implement web application firewalls to detect and block suspicious URL patterns, and conduct regular security assessments to identify similar vulnerabilities in other components of their web infrastructure.