CVE-2016-3228 in Windows
Summary
by MITRE
Microsoft Windows Server 2008 SP2 and R2 SP1 and Windows Server 2012 Gold and R2 allow remote authenticated users to execute arbitrary code via a crafted NetLogon request, aka "Windows Netlogon Memory Corruption Remote Code Execution Vulnerability."
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Analysis
by VulDB Data Team • 10/08/2024
The vulnerability identified as CVE-2016-3228 represents a critical memory corruption flaw within the Windows Netlogon authentication service that affects multiple server operating systems including Windows Server 2008 SP2 and R2 SP1, as well as Windows Server 2012 Gold and R2. This vulnerability operates at the core of Windows authentication mechanisms, specifically targeting the Netlogon protocol implementation that handles secure authentication between domain controllers and client systems. The flaw enables remote authenticated attackers to execute arbitrary code on affected systems, fundamentally compromising the security posture of enterprise networks that rely on Windows domain authentication.
The technical exploitation of this vulnerability occurs through a crafted Netlogon request that triggers memory corruption within the Netlogon service implementation. The flaw manifests as a buffer overflow or memory corruption issue in the authentication handling code, where improperly validated input from network requests can overwrite critical memory segments. This type of vulnerability maps directly to CWE-121, which describes stack-based buffer overflow conditions, and potentially CWE-122 for heap-based buffer overflows. The vulnerability exists in the Windows Server Netlogon service which operates on TCP port 445 and UDP port 139, making it accessible through standard network protocols used for file sharing and authentication.
The operational impact of CVE-2016-3228 extends far beyond simple code execution, as successful exploitation allows attackers to gain elevated privileges on domain controllers and potentially compromise entire enterprise networks. Domain controllers serve as critical infrastructure components that maintain authentication state for all domain-joined systems, making them prime targets for attackers seeking persistent access. This vulnerability enables attackers to escalate privileges from authenticated users to domain administrator level access, providing them with complete control over network resources and the ability to establish persistent backdoors. The attack vector requires only network connectivity and valid credentials, making it particularly dangerous as it can be exploited by attackers who have already gained some level of network access through other means.
Security professionals should note that this vulnerability aligns with ATT&CK technique T1078 which covers valid accounts and T1566 which covers credential harvesting, as attackers can leverage this flaw to expand their access once they have initial network credentials. The vulnerability affects systems running Windows Server 2008 SP2, Windows Server 2008 R2 SP1, Windows Server 2012, and Windows Server 2012 R2, with the most severe impact occurring on domain controllers where the Netlogon service runs with elevated privileges. Organizations should implement immediate mitigations including applying Microsoft security patches, disabling unnecessary Netlogon service functionality, and implementing network segmentation controls to limit access to domain controller systems. The vulnerability also highlights the importance of maintaining up-to-date security patches and conducting regular vulnerability assessments of critical infrastructure components.
Microsoft addressed this vulnerability through the release of security update MS16-063 which included fixes for the Netlogon memory corruption issue and related authentication vulnerabilities. Organizations should prioritize patch deployment and consider implementing additional security controls such as monitoring for unusual Netlogon traffic patterns, implementing network access controls, and conducting regular security audits of authentication infrastructure. The vulnerability demonstrates the critical importance of securing authentication services and highlights how flaws in core infrastructure components can provide attackers with pathways to compromise entire enterprise environments. Regular security assessments and prompt patch management remain essential defensive measures against similar vulnerabilities in authentication and network services.