CVE-2008-4542 in Unity
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in Cisco Unity 4.x before 4.2(1)ES162, 5.x before 5.0(1)ES56, and 7.x before 7.0(2)ES8 allows remote authenticated administrators to inject arbitrary web script or HTML by entering it in the database (aka data store).
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Analysis
by VulDB Data Team • 08/19/2019
The vulnerability described in CVE-2008-4542 represents a critical cross-site scripting flaw affecting Cisco Unity communication platforms across multiple version branches. This vulnerability specifically impacts Cisco Unity versions 4.x prior to 4.2(1)ES162, 5.x prior to 5.0(1)ES56, and 7.x prior to 7.0(2)ES8, creating a significant security risk for organizations relying on these unified communication systems. The flaw resides in the platform's handling of data stored in the database, where authenticated administrative users can inject malicious web scripts or HTML content that persists within the system's data store. This vulnerability falls under the CWE-79 category of Cross-Site Scripting, specifically categorized as a reflected XSS variant where user input is improperly sanitized before being rendered back to other users. The attack vector requires an authenticated administrator to execute the payload, but the impact extends beyond the immediate user due to the nature of XSS vulnerabilities. The vulnerability is particularly concerning because it operates within the administrative interface where users have elevated privileges, potentially allowing attackers who gain administrative access to establish persistent malicious scripts that could compromise all users interacting with the system. The database storage component of this vulnerability represents a sophisticated attack surface since it allows for persistent XSS payloads that can survive system restarts and are not limited to a single session or page view.
The operational impact of this vulnerability extends far beyond simple script injection, as it provides attackers with the capability to execute arbitrary code within the context of other users' browsers. When an authenticated administrator inputs malicious content into the database fields, this content becomes part of the system's persistent data store and can be rendered to other users who access the platform, particularly through administrative interfaces or reporting features. The vulnerability enables attackers to perform session hijacking, steal authentication cookies, redirect users to malicious sites, or even execute malicious scripts that could exfiltrate sensitive data from the organization. This type of vulnerability aligns with ATT&CK technique T1059.007 for Command and Scripting Interpreter, where attackers can leverage the platform to execute malicious scripts against other users. The persistence aspect of the vulnerability, combined with the administrative privileges required to exploit it, creates a particularly dangerous scenario where an attacker with access to an admin account can establish long-term malicious presence within the organization's communication infrastructure.
Mitigation strategies for this vulnerability must address both immediate patching requirements and broader security architectural improvements. Organizations should immediately upgrade to the patched versions specified in the CVE advisory, specifically moving beyond the mentioned release thresholds for each affected version branch. The patching process should include comprehensive testing to ensure that the updates do not disrupt existing communication services, as Cisco Unity platforms are critical infrastructure components for enterprise communications. Additionally, network segmentation and access controls should be implemented to limit administrative access to the platform, reducing the attack surface for privilege escalation. Security monitoring should include detection of unusual administrative activities and input validation monitoring within database fields, as the vulnerability requires authenticated access but can be exploited through legitimate administrative functions. Organizations should also implement web application firewalls and input sanitization measures to detect and prevent malicious script injection attempts. The vulnerability demonstrates the importance of proper input validation and output encoding in web applications, as recommended by OWASP Top 10 security practices and aligning with the principle of defense in depth that requires multiple layers of security controls to protect against various attack vectors. Regular security assessments and penetration testing should be conducted to identify similar vulnerabilities in other communication platforms and ensure that security controls remain effective against evolving threat landscapes.