CVE-2011-1984 in Windows
Summary
by MITRE
WINS in Microsoft Windows Server 2003 SP2 and Server 2008 SP2, R2, and R2 SP1 allows local users to gain privileges by sending crafted packets over the loopback interface, aka "WINS Local Elevation of Privilege Vulnerability."
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Analysis
by VulDB Data Team • 01/12/2025
The WINS local elevation of privilege vulnerability identified as CVE-2011-1984 represents a critical security flaw within the Windows Internet Name Service implementation across multiple server operating systems. This vulnerability specifically affects Microsoft Windows Server 2003 Service Pack 2, Windows Server 2008 Service Pack 2, Windows Server 2008 R2, and Windows Server 2008 R2 Service Pack 1 installations. The vulnerability stems from improper validation of packets received through the loopback interface, creating a pathway for local attackers to escalate their privileges within the system.
The technical exploitation mechanism relies on the WINS service's handling of specially crafted network packets that are transmitted through the loopback interface, which is typically considered a trusted internal communication channel. When the WINS service processes these malformed packets, it fails to properly validate the packet structure and content, leading to potential memory corruption or privilege escalation conditions. This flaw operates at the kernel level within the Windows networking stack, making it particularly dangerous as successful exploitation can grant attackers SYSTEM level privileges, effectively compromising the entire server environment.
From an operational perspective, this vulnerability presents significant risk to organizations maintaining Windows Server infrastructure, particularly those with multiple server roles or environments where local access might be compromised. The attack vector requires local system access, making it somewhat more constrained than remote exploits, but still highly problematic as it can be leveraged by malicious insiders or attackers who have already gained initial access to a system. The impact extends beyond simple privilege escalation as compromised WINS services can potentially disrupt network name resolution and affect other services dependent on proper WINS functionality. This vulnerability aligns with CWE-121, which addresses stack-based buffer overflow conditions, and demonstrates characteristics consistent with privilege escalation vulnerabilities in network services.
The exploitation of this vulnerability can lead to complete system compromise, allowing attackers to execute arbitrary code with elevated privileges, access sensitive data, modify system configurations, and potentially establish persistence mechanisms. Organizations running affected versions of Windows Server should prioritize patching and implementation of network segmentation measures to limit local access to critical systems. Mitigation strategies should include disabling unnecessary WINS services, implementing proper access controls, and deploying network monitoring solutions to detect anomalous packet patterns on the loopback interface. This vulnerability also highlights the importance of secure coding practices in system-level services and demonstrates how seemingly benign network protocols can become attack vectors when proper input validation is lacking. The ATT&CK framework categorizes this vulnerability under privilege escalation techniques, specifically focusing on service execution and kernel exploits that leverage system-level vulnerabilities to gain unauthorized access to elevated privileges.