CVE-2013-6962 in WebEx Meeting Center
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in the mobile-browser subsystem in Cisco WebEx Meeting Center allows remote attackers to inject arbitrary web script or HTML via a crafted URL, aka Bug ID CSCul36228.
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Analysis
by VulDB Data Team • 12/22/2024
The vulnerability identified as CVE-2013-6962 represents a critical cross-site scripting flaw within Cisco WebEx Meeting Center's mobile-browser subsystem. This weakness enables remote attackers to execute malicious web scripts or HTML code through carefully constructed URLs, potentially compromising user sessions and data integrity. The vulnerability specifically affects the mobile browsing functionality of the WebEx platform, which serves as a crucial component for remote collaboration and meeting participation. The issue manifests when the system fails to properly sanitize user input in URL parameters, creating an attack vector that can be exploited without requiring authentication or privileged access. The bug ID CSCul36228 indicates this was recognized and tracked within Cisco's internal vulnerability management system, highlighting the organization's awareness of the security risk. This type of vulnerability undermines the fundamental security assumptions of web applications by allowing attackers to inject malicious code that executes in the context of authenticated users' browsers.
The technical implementation of this XSS vulnerability stems from insufficient input validation and output encoding mechanisms within the mobile browser component of WebEx Meeting Center. When users navigate to specially crafted URLs containing malicious script payloads, the system processes these inputs without adequate sanitization, allowing the injected code to be rendered as part of the web page content. This flaw operates at the application layer, specifically targeting the mobile web rendering engine that handles URL navigation and content display. The vulnerability can be exploited across different mobile platforms that support WebEx's mobile browser functionality, making it particularly dangerous given the widespread use of mobile devices for business meetings and collaboration. Attackers can leverage this weakness to steal session cookies, redirect users to malicious sites, or perform actions on behalf of authenticated users. The vulnerability's classification aligns with CWE-79 which defines cross-site scripting as the injection of malicious code into web applications, and it maps to ATT&CK technique T1059.008 for script injection attacks. The exploitation requires only a single malicious URL to be shared with a target, making it highly effective for social engineering campaigns.
The operational impact of this vulnerability extends beyond simple data theft or session hijacking, as it can lead to complete compromise of user environments and corporate networks. Attackers can use the XSS payload to establish persistent access through cookie theft, redirect users to phishing sites, or even deploy additional malware. In enterprise environments where WebEx is extensively used for business meetings, this vulnerability creates a significant attack surface that could be leveraged to gain access to sensitive corporate information. The mobile nature of the vulnerability adds complexity to defense strategies since users may access WebEx from various unsecured networks, including public Wi-Fi hotspots. Organizations relying on WebEx for critical business communications face potential disruption of their collaboration processes, as attackers could use this vulnerability to intercept meeting content or manipulate meeting participants. The vulnerability also impacts user trust in the platform, potentially leading to reduced adoption rates or forced migration to alternative collaboration tools. The risk is compounded by the fact that mobile users may be less cautious about URL verification compared to desktop users, making the attack surface even larger.
Organizations should implement immediate mitigations including updating to patched versions of Cisco WebEx Meeting Center, deploying web application firewalls to detect and block suspicious URL patterns, and implementing strict URL validation policies. Network administrators should monitor for suspicious traffic patterns and implement content security policies that prevent execution of unauthorized scripts. User education programs should emphasize the importance of verifying URLs before clicking, particularly when accessing collaboration platforms from mobile devices. The vulnerability demonstrates the importance of input sanitization and output encoding in web applications, principles that should be reinforced across all development practices. Organizations should also consider implementing browser security controls such as sandboxing mobile browser components and using secure coding practices to prevent similar issues in custom applications. The incident highlights the necessity of regular security assessments for third-party collaboration tools, particularly those with mobile browser capabilities. Security teams should also establish incident response procedures specifically designed to address mobile browser-based vulnerabilities, as the attack vectors and exploitation methods differ significantly from traditional desktop web applications. The vulnerability serves as a reminder that mobile platforms often receive less security scrutiny than desktop applications, creating potential gaps in overall security posture that attackers can exploit.