CVE-2017-0039 in Windows
Summary
by MITRE
Microsoft Windows Vista SP2 and Server 2008 SP2 mishandle dynamic link library (DLL) loading, which allows local users to gain privileges via a crafted application, aka "Library Loading Input Validation Remote Code Execution Vulnerability."
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Analysis
by VulDB Data Team • 12/24/2024
The vulnerability identified as CVE-2017-0039 represents a critical flaw in Microsoft Windows Vista SP2 and Windows Server 2008 SP2 operating systems that stems from improper dynamic link library loading mechanisms. This issue falls under the category of library loading input validation flaws, which are categorized as CWE-778 by the Common Weakness Enumeration system. The vulnerability specifically manifests when the operating system fails to properly validate the paths of dynamically loaded libraries, creating opportunities for malicious code execution through crafted applications that manipulate the DLL loading process.
The technical implementation of this vulnerability exploits the Windows operating system's search order for dynamic link libraries, where the system attempts to locate and load required DLL files in a predictable sequence. When a malicious application is executed, it can manipulate this search order by placing a specially crafted DLL file in a location that Windows will prioritize during the loading process. This allows an attacker to inject malicious code into the legitimate application's memory space, effectively bypassing security mechanisms designed to prevent unauthorized code execution. The vulnerability operates at the kernel level, making it particularly dangerous as it can be leveraged to escalate privileges from a standard user account to SYSTEM level access, which provides complete control over the affected system.
The operational impact of CVE-2017-0039 is significant as it enables local privilege escalation attacks that can be executed without requiring network connectivity or specialized attack infrastructure. Attackers can exploit this vulnerability by creating a malicious application that loads a specially crafted DLL file, which then executes with elevated privileges. This vulnerability aligns with ATT&CK technique T1068, which describes the use of local privilege escalation techniques to gain SYSTEM-level access. The attack vector is particularly concerning because it can be triggered by simply running a malicious application, making it difficult to defend against through traditional network-based security measures. The vulnerability affects systems that are running older versions of Windows that have not received the necessary security updates, particularly those that have not installed the specific patches released by Microsoft to address this issue.
Mitigation strategies for CVE-2017-0039 primarily focus on immediate patch deployment as the most effective solution, with Microsoft releasing security updates that correct the DLL loading validation mechanisms. Organizations should implement comprehensive patch management protocols to ensure all systems receive the necessary updates promptly. Additional mitigations include implementing application whitelisting policies that restrict which applications can execute on the system, thereby preventing malicious applications from being launched. The principle of least privilege should be enforced by ensuring that users operate with minimal required permissions, reducing the potential impact of successful exploitation. Network segmentation and monitoring solutions can help detect anomalous behavior patterns that may indicate exploitation attempts. Security configurations should also include disabling unnecessary services and features that might contribute to the vulnerability's exploitation potential. System administrators should regularly audit application execution logs and monitor for suspicious DLL loading activities that could indicate attempted exploitation of this vulnerability.