CVE-2016-0087 in Windows
Summary
by MITRE
Microsoft Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, and Windows 7 SP1 do not properly validate handles, which allows local users to gain privileges via a crafted application, aka "Windows Elevation of Privilege Vulnerability."
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Analysis
by VulDB Data Team • 11/03/2024
This vulnerability represents a critical privilege escalation flaw in Microsoft Windows operating systems that affects Vista SP2, Windows Server 2008 SP2 and R2 SP1, and Windows 7 SP1. The issue stems from improper handle validation mechanisms within the Windows kernel, creating a pathway for local attackers to elevate their privileges from standard user level to system administrator level. The vulnerability is classified as a Windows Elevation of Privilege Vulnerability under the Common Weakness Enumeration framework as CWE-264, which specifically addresses permissions, privileges, and access controls. Attackers can exploit this weakness by crafting a malicious application that manipulates handle validation processes, bypassing normal security boundaries that should prevent unauthorized privilege escalation.
The technical exploitation occurs through manipulation of kernel-level handle validation routines where the operating system fails to properly verify the legitimacy of handle operations. When a malicious application attempts to perform operations on kernel objects, the system should validate that the requesting process has appropriate permissions and that the handle being used is valid. In this case, the validation mechanism is insufficient, allowing attackers to craft handle operations that appear legitimate to the kernel but actually result in privilege elevation. This flaw operates at the kernel level and requires local access, meaning an attacker must already have a user account on the target system to exploit it, though the ultimate impact allows for complete system compromise.
The operational impact of CVE-2016-0087 is severe as it provides attackers with the ability to gain SYSTEM-level privileges, which represents the highest level of access within Windows systems. Once successfully exploited, attackers can perform any action on the compromised system including installing malware, modifying system files, creating new user accounts, accessing sensitive data, and disabling security features. The vulnerability affects a broad range of Windows versions making it particularly dangerous in enterprise environments where these older operating systems may still be in use. From an adversary tactics perspective, this vulnerability aligns with the ATT&CK technique T1068, which involves exploiting vulnerabilities to gain elevated privileges, and T1059, which covers the execution of malicious code through legitimate system processes.
Mitigation strategies for this vulnerability include immediate deployment of Microsoft security patches released in their January 2016 security updates, which address the handle validation flaw through kernel-level code modifications. Organizations should prioritize patching across all affected Windows versions, particularly focusing on servers and systems with elevated privileges. Additional defensive measures include implementing least privilege principles to limit user account permissions, disabling unnecessary services and applications, and monitoring for unusual handle operations in system logs. Network segmentation and intrusion detection systems can help identify potential exploitation attempts, while regular security audits should verify that systems remain patched and that no unauthorized privilege escalation has occurred. The vulnerability demonstrates the critical importance of maintaining up-to-date security patches and the potential consequences of running unsupported operating system versions in enterprise environments.