CVE-2016-3239 in Windows
Summary
by MITRE
The Print Spooler service in Microsoft Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8.1, Windows Server 2012 Gold and R2, Windows RT 8.1, and Windows 10 Gold and 1511 allows local users to gain privileges via vectors involving filesystem write operations, aka "Windows Print Spooler Elevation of Privilege Vulnerability."
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 09/01/2022
The Windows Print Spooler service vulnerability CVE-2016-3239 represents a critical elevation of privilege flaw that affects multiple Microsoft Windows operating systems including Vista SP2 through Windows 10 version 1511. This vulnerability specifically targets the print spooler service which is responsible for managing print jobs and printer communications within the Windows operating system. The flaw enables local attackers to escalate their privileges from standard user level to SYSTEM level access, providing them with complete control over the affected system. The vulnerability stems from improper handling of filesystem write operations within the print spooler component, creating an exploitable condition that can be leveraged for privilege escalation attacks.
The technical implementation of this vulnerability involves the print spooler service's inadequate validation of file operations during the processing of print jobs. When local users interact with the print spooler service, they can manipulate the filesystem write operations to overwrite critical system files or modify registry entries that control privilege levels. This flaw falls under the Common Weakness Enumeration category CWE-276, which describes improper privilege management, and more specifically relates to CWE-73, which covers external control of filename or path. The vulnerability is particularly dangerous because it requires minimal privileges to exploit and can be triggered through normal user interactions with the print spooler service, making it an attractive target for attackers seeking to establish persistent access to compromised systems.
The operational impact of CVE-2016-3239 extends beyond simple privilege escalation, as it can serve as a foundational attack vector for more sophisticated exploitation campaigns. Attackers can leverage this vulnerability to install persistent backdoors, modify system configurations, or deploy additional malware without requiring administrator credentials. The vulnerability's presence in such a wide range of Windows versions means that organizations with legacy systems or those that have not yet deployed patches remain at significant risk. From an adversarial perspective, this vulnerability aligns with ATT&CK technique T1068, which covers local privilege escalation, and T1547, covering registry run keys and startup folder modifications. The flaw can be particularly devastating in enterprise environments where the print spooler service is actively used, as it provides a consistent attack surface that can be exploited across multiple systems.
Mitigation strategies for CVE-2016-3239 should include immediate deployment of Microsoft security patches, which address the underlying privilege management issues within the print spooler service. Organizations should also implement the principle of least privilege by disabling unnecessary print spooler functionality and restricting local user access to print-related services. Network segmentation and monitoring can help detect anomalous print spooler activities that might indicate exploitation attempts. Additionally, system administrators should regularly audit print queue configurations and monitor for unauthorized modifications to system files that could indicate successful exploitation. The vulnerability demonstrates the importance of maintaining up-to-date security patches and highlights the critical need for comprehensive vulnerability management programs that address both known and emerging threats in enterprise environments.