CVE-2017-0004 in Windows
Summary
by MITRE
The Local Security Authority Subsystem Service (LSASS) in Microsoft Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, and Windows 7 SP1 allows remote attackers to cause a denial of service (reboot) via a crafted authentication request, aka "Local Security Authority Subsystem Service Denial of Service Vulnerability."
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Analysis
by VulDB Data Team • 04/20/2025
The vulnerability identified as CVE-2017-0004 represents a critical denial of service weakness within the Local Security Authority Subsystem Service component of Microsoft Windows operating systems. This flaw specifically affects Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, and Windows 7 SP1 systems, making it a widespread issue across multiple server and desktop platforms. The vulnerability operates through a crafted authentication request that triggers an abnormal system reboot, effectively disrupting normal operations and availability of affected systems. This type of vulnerability falls under the CWE-119 category of improper restriction of operations within a recognized security boundary, as it involves unauthorized manipulation of system services that should normally be protected from external interference.
The technical exploitation of this vulnerability occurs through the manipulation of authentication requests that are processed by the LSASS service, which is responsible for enforcing security policies and managing authentication credentials within Windows environments. When a malicious actor submits a specially crafted authentication request, the LSASS service fails to properly validate or handle the malformed input, leading to an uncontrolled system reboot. This behavior demonstrates a lack of proper input validation and error handling within the security subsystem, allowing attackers to trigger system instability through legitimate authentication mechanisms. The vulnerability's impact is particularly severe because LSASS is a critical system service that must remain operational for proper authentication and authorization functions to work correctly.
The operational consequences of this vulnerability extend beyond simple service disruption, as it can be exploited to create persistent availability issues that affect entire network domains. Organizations relying on Windows authentication services for domain operations face significant risks when this vulnerability is exploited, as the resulting reboots can disrupt user access, application availability, and overall network stability. The attack vector requires minimal privileges and can be executed remotely, making it particularly dangerous in enterprise environments where authentication services are frequently accessed. This vulnerability directly impacts the availability component of the CIA triad and can be categorized under ATT&CK technique T1499.004 for endpoint denial of service, as it specifically targets system services to prevent normal operation.
Mitigation strategies for CVE-2017-0004 should focus on immediate patch deployment through Microsoft's security updates, which address the underlying validation issues within the LSASS service. Organizations should also implement network segmentation to limit access to authentication services and monitor for unusual authentication patterns that might indicate exploitation attempts. Additional defensive measures include configuring firewalls to restrict authentication traffic to trusted sources and implementing intrusion detection systems that can identify malformed authentication requests. The vulnerability highlights the importance of maintaining up-to-date security patches and demonstrates how flaws in core system services can create widespread operational impacts. Security teams should also consider implementing monitoring solutions that can detect abnormal reboot patterns and authentication service behavior that might indicate exploitation of this or similar vulnerabilities.