CVE-2018-15436 in WebEx Training Center
Summary
by MITRE
A vulnerability in the web-based management interface of Cisco Webex Events Center, Cisco Webex Meeting Center, Cisco Webex Support Center, and Cisco Webex Training Center could allow an unauthenticated, remote attacker to conduct a cross-site scripting (XSS) attack against a user of the web-based management interface of the affected service. The vulnerability is due to insufficient validation of user-supplied input by the web-based management interface of the affected service. An attacker could exploit this vulnerability by persuading a user of the interface to click a malicious link. A successful exploit could allow the attacker to execute arbitrary script code in the context of the affected interface or access sensitive, browser-based information.
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 05/22/2023
This vulnerability exists within the web-based management interfaces of multiple Cisco Webex collaboration products including Events Center, Meeting Center, Support Center, and Training Center. The flaw represents a classic cross-site scripting vulnerability that stems from inadequate input validation mechanisms within the affected web applications. The vulnerability has been categorized under CWE-79 which specifically addresses cross-site scripting flaws, making it a well-documented and widely recognized security weakness in web application development. The attack vector requires an unauthenticated remote attacker to manipulate a user into clicking a malicious link, which aligns with the common social engineering techniques used in modern cyber attacks.
The technical implementation of this vulnerability occurs when the web-based management interface fails to properly sanitize or validate user-supplied input before processing or rendering it within the application's user interface. This insufficient validation creates an opening for attackers to inject malicious scripts that can execute within the victim's browser context. The vulnerability is particularly dangerous because it operates entirely within the web application layer, leveraging the trust relationship between the user's browser and the targeted management interface. When a user clicks on a malicious link, the script code becomes part of the page's execution context, potentially allowing attackers to access sensitive information, hijack user sessions, or perform actions on behalf of the authenticated user.
The operational impact of this vulnerability extends beyond simple script execution as it represents a significant threat to the confidentiality and integrity of the affected systems. Attackers could potentially access sensitive browser-based information, including session cookies, user credentials, or other authenticated data that might be accessible through the compromised interface. The vulnerability affects the management capabilities of Cisco Webex services, which could provide attackers with elevated privileges and access to critical system functions. From an attacker's perspective, this vulnerability fits within the ATT&CK framework under the T1059.007 technique for scripting, specifically targeting the web application layer. The attack chain typically involves initial reconnaissance, crafting of malicious payloads, and delivery through social engineering or compromised communication channels.
Organizations utilizing these Cisco Webex services face substantial risk from this vulnerability, as it allows remote exploitation without requiring authentication credentials. The attack surface is particularly concerning given that these are management interfaces that likely contain sensitive operational data and administrative controls. Mitigation strategies should focus on implementing proper input validation and output encoding mechanisms within the web applications. The recommended approach includes deploying web application firewalls, implementing content security policies, and ensuring that all user-supplied input is properly sanitized before being processed or displayed. Additionally, organizations should conduct regular security assessments and maintain updated patches for their Cisco Webex implementations. The vulnerability demonstrates the critical importance of input validation in web application security and aligns with industry best practices outlined in OWASP Top Ten, specifically addressing the prevention of cross-site scripting attacks. Security teams should also implement user awareness training to reduce the risk of successful social engineering attacks that exploit this vulnerability through malicious link delivery mechanisms.