CVE-2016-5305 in Endpoint Protection Manager
Summary
by MITRE
Multiple cross-site scripting (XSS) vulnerabilities in management scripts in Symantec Endpoint Protection Manager (SEPM) 12.1 before RU6 MP5 allow remote authenticated users to inject arbitrary web script or HTML via a "DOM link manipulation" attack.
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Analysis
by VulDB Data Team • 08/25/2022
The vulnerability identified as CVE-2016-5305 represents a critical cross-site scripting flaw affecting Symantec Endpoint Protection Manager version 12.1 prior to RU6 MP5. This issue resides within the management scripts of the SEPM platform, which serves as a centralized security management solution for enterprise environments. The vulnerability specifically exploits DOM link manipulation techniques that enable authenticated attackers to inject malicious web scripts or HTML content into the application's user interface. Such flaws are particularly dangerous in security management platforms where administrators frequently interact with the system, as they can potentially compromise the entire security infrastructure. The vulnerability affects the management console components that handle user interactions and data display, creating opportunities for attackers to execute malicious code within the context of authenticated sessions.
The technical implementation of this vulnerability stems from inadequate input validation and output encoding within the SEPM management scripts. Attackers can leverage DOM link manipulation to inject malicious payloads that persist in the application's DOM structure, allowing the execution of arbitrary JavaScript code when legitimate users interact with affected pages. This type of vulnerability falls under CWE-79 which specifically addresses cross-site scripting flaws where untrusted data is improperly sanitized before being rendered in web browsers. The attack vector requires authentication, meaning that an attacker must first obtain valid credentials to exploit this vulnerability, but once authenticated, the impact can be severe as the attacker operates within the privileges of the authenticated session. The DOM manipulation approach indicates that the vulnerability exists in how the application processes dynamic content updates rather than traditional input validation failures.
The operational impact of CVE-2016-5305 extends beyond simple script injection, as it can enable attackers to escalate privileges and access sensitive administrative functions within the SEPM environment. An authenticated attacker could potentially steal session cookies, redirect users to malicious sites, or execute arbitrary commands on behalf of the administrator. This vulnerability directly impacts the principle of least privilege by allowing attackers to bypass normal access controls and potentially gain unauthorized access to critical security policies and configurations. The attack could result in complete compromise of the security management platform, enabling adversaries to modify security settings, disable protection mechanisms, or exfiltrate sensitive data from the enterprise network. The vulnerability's presence in the management console components means that successful exploitation could undermine the entire security posture of organizations relying on Symantec Endpoint Protection Manager for endpoint security.
Organizations should implement immediate mitigations including applying Symantec's recommended patches and updates to bring their SEPM installations to RU6 MP5 or later versions where this vulnerability has been addressed. Network segmentation and monitoring should be enhanced to detect anomalous activities that might indicate exploitation attempts, particularly focusing on unusual DOM manipulation patterns or unexpected script injections. Input validation controls should be strengthened at the application level, implementing proper encoding and sanitization of all user-supplied data before processing or display. Security teams should conduct comprehensive vulnerability assessments of their SEPM deployments to identify any potential variants of this vulnerability and ensure that all management console components are properly hardened. Additionally, implementing web application firewalls and content security policies can provide additional layers of protection against similar DOM-based XSS attacks, aligning with ATT&CK technique T1059.007 for command and scripting interpreter execution through web interfaces. Regular security training for administrators on recognizing and preventing XSS attack vectors remains crucial for maintaining overall security hygiene.