CVE-2015-6408 in Unity Connection
Summary
by MITRE
Cross-site request forgery (CSRF) vulnerability in Cisco Unity Connection 11.5(0.98) allows remote attackers to hijack the authentication of arbitrary users, aka Bug ID CSCux24578.
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Analysis
by VulDB Data Team • 06/30/2022
Cisco Unity Connection 11.5(0.98) contains a critical cross-site request forgery vulnerability that enables remote attackers to exploit the authentication mechanisms of arbitrary users without their knowledge or consent. This vulnerability falls under the CWE-352 category, which specifically addresses cross-site request forgery flaws in web applications. The issue manifests when the application fails to properly validate and enforce the authenticity of requests originating from authenticated users, creating a pathway for malicious actors to perform unauthorized actions on behalf of legitimate users. The vulnerability is particularly concerning because it operates at the authentication layer, allowing attackers to hijack active sessions and execute commands with the privileges of targeted users. The bug ID CSCux24578 indicates this was a recognized issue within Cisco's internal tracking system, highlighting the organization's awareness of the flaw before public disclosure. The operational impact of this vulnerability extends beyond simple data theft, as attackers could potentially modify user configurations, access sensitive communications, or escalate privileges within the unified communications environment. This CSRF flaw specifically affects the web-based administration interface of Cisco Unity Connection, which is commonly used for managing voicemail systems, user accounts, and telephony settings in enterprise environments.
The technical exploitation of this CSRF vulnerability occurs when an attacker crafts malicious web pages or emails that contain embedded requests to the Unity Connection application. These requests appear to originate from authenticated users because they include valid session tokens or authentication cookies that are automatically transmitted by browsers when accessing the target application. The flaw exists because the application does not implement proper anti-CSRF token validation mechanisms or does not adequately verify the origin of incoming requests. Modern web applications should employ anti-CSRF tokens that are unique per session and validated on each request, but Cisco Unity Connection 11.5(0.98) fails to enforce this critical security control. Attackers can leverage this weakness through social engineering campaigns, where victims are tricked into clicking malicious links or visiting compromised websites that automatically submit requests to the Unity Connection system. The vulnerability is particularly dangerous in enterprise environments where Unity Connection systems manage critical communication infrastructure, as successful exploitation could lead to complete compromise of voicemail systems and unauthorized access to sensitive business communications.
Organizations utilizing Cisco Unity Connection 11.5(0.98) face significant operational risks from this CSRF vulnerability, as it represents a fundamental flaw in the application's authentication and authorization mechanisms. The attack surface is broad since the vulnerability affects the web interface used for administrative functions, potentially allowing attackers to modify user accounts, access voicemail messages, or disrupt communication services. According to ATT&CK framework category T1531, this vulnerability enables privilege escalation and lateral movement within the network, as compromised Unity Connection systems can serve as entry points for further attacks. The impact on business continuity is substantial, as attackers could disable voicemail services, modify critical communication settings, or access sensitive information stored in the unified communications platform. Organizations may also face regulatory compliance issues if sensitive data is accessed or modified through this vulnerability, particularly in industries with strict data protection requirements. The vulnerability affects not only individual user accounts but also the overall integrity of the communication infrastructure, potentially disrupting business operations and creating security gaps that could be exploited for more sophisticated attacks.
Mitigation strategies for this CSRF vulnerability should include immediate implementation of Cisco's security patches and updates, as well as network-level protections such as web application firewalls that can detect and block suspicious cross-site requests. Organizations should also implement additional security controls including proper session management, anti-CSRF token implementation, and origin validation checks within the application layer. Network segmentation can help limit the potential impact of successful exploitation by restricting access to the Unity Connection system from unauthorized network segments. Security monitoring should be enhanced to detect unusual patterns in authentication requests or administrative activities that might indicate CSRF attacks. The implementation of multi-factor authentication for administrative access can provide additional protection layers, though this does not directly address the CSRF vulnerability itself. Regular security assessments and vulnerability scanning should be conducted to identify similar flaws in other applications within the organization's infrastructure, as this vulnerability demonstrates the importance of proper input validation and authentication controls. Organizations should also consider implementing security awareness training to help users recognize social engineering attempts that could leverage this CSRF vulnerability, as user education remains a critical component of overall security posture. The remediation process should include comprehensive testing to ensure that patches do not introduce compatibility issues with existing systems while maintaining the security improvements necessary to address the CSRF flaw.