CVE-2016-3225 in Windows
Summary
by MITRE
The SMB server component 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 a crafted application that forwards an authentication request to an unintended service, aka "Windows SMB Server Elevation of Privilege Vulnerability."
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Analysis
by VulDB Data Team • 05/05/2025
This vulnerability resides within the Server Message Block protocol implementation in various microsoft windows operating systems including vista sp2 server 2008 sp2 and r2 sp1 windows 7 sp1 windows 81 windows server 2012 gold and r2 windows rt 81 and windows 10 gold and 1511. the flaw enables local attackers to escalate their privileges by crafting a malicious application that can forward authentication requests to unintended services. this represents a critical elevation of privilege vulnerability that directly impacts the security model of windows systems.
the technical mechanism involves the smb server component failing to properly validate authentication requests when they are forwarded to other services. specifically when a legitimate authentication request is processed by the smb server it may inadvertently forward this request to an unintended service or endpoint. this misdirection occurs due to insufficient validation of the target service or endpoint in the authentication forwarding process. the vulnerability stems from improper handling of service principal names and authentication contexts during the smb protocol processing. according to cwe standards this maps to cwe 264 permissions privileges and access controls with specific focus on cwe 284 improper access control.
the operational impact of this vulnerability is significant as it allows local users to escalate their privileges from standard user level to system level access. an attacker with local access can exploit this weakness to execute arbitrary code with elevated privileges without requiring additional authentication mechanisms. the vulnerability is particularly concerning because it leverages legitimate system functionality to achieve privilege escalation, making detection more challenging. this type of vulnerability aligns with attack techniques described in the mitre att&ck framework under privilege escalation tactics particularly those involving windows management instrumentation and service manipulation.
the exploitation requires a local account on the target system and involves crafting a specific application that can manipulate the smb authentication forwarding mechanism. attackers can potentially leverage this vulnerability to establish persistent access, escalate to system level privileges, and potentially move laterally within a network. the vulnerability affects multiple windows versions simultaneously, indicating a widespread issue in the smb protocol implementation across the windows ecosystem. organizations should consider implementing immediate mitigations including disabling unnecessary smb services, applying security patches, and monitoring for suspicious authentication patterns that may indicate exploitation attempts.
mitigation strategies should include applying the relevant microsoft security updates that address this specific vulnerability, disabling smbv1 protocol if not required for legacy systems, and implementing network segmentation to limit local access privileges. the vulnerability demonstrates the importance of proper authentication context validation in protocol implementations and highlights the need for robust input validation in server-side components. organizations should also implement monitoring for unusual authentication forwarding patterns and consider network-based intrusion detection systems to identify potential exploitation attempts. given the nature of the vulnerability and its potential for privilege escalation, this represents a critical security concern requiring immediate attention and remediation across affected systems.