CVE-2016-0016 in Windows
Summary
by MITRE
Microsoft Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8, Windows 8.1, Windows Server 2012 Gold and R2, Windows RT Gold and 8.1, and Windows 10 Gold and 1511 mishandle DLL loading, which allows local users to gain privileges via a crafted application, aka "DLL Loading Remote Code Execution Vulnerability."
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Analysis
by VulDB Data Team • 06/27/2024
The vulnerability identified as CVE-2016-0016 represents a critical security flaw in multiple Microsoft Windows operating systems that affects the dynamic link library (dll) loading mechanism. This issue stems from how the operating system handles the resolution and loading of dynamic link libraries, creating an opportunity for malicious actors to exploit the system's trust model and escalate privileges. The vulnerability impacts a broad range of Windows versions including Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8, Windows 8.1, Windows Server 2012 Gold and R2, Windows RT Gold and 8.1, and Windows 10 Gold and 1511, indicating a widespread exposure across the Windows ecosystem. This flaw specifically relates to the manner in which the system searches for and loads dll files, creating a path traversal vulnerability that can be manipulated by local users to execute arbitrary code with elevated privileges.
The technical implementation of this vulnerability exploits the Windows DLL search order mechanism, which follows a specific sequence when resolving dll dependencies. When an application attempts to load a dll, Windows searches through a predefined path sequence including the current working directory, system directories, and other locations. The flaw occurs when the system fails to properly validate or restrict the loading of dll files from untrusted locations, allowing an attacker to place a malicious dll in a directory that gets searched before the legitimate system dlls. This behavior aligns with CWE-426, which describes the weakness of allowing untrusted data to influence the search path used to load libraries, and can be categorized under the broader ATT&CK technique T1059.001 for command and scripting interpreter usage. The vulnerability specifically enables a local privilege escalation attack where an attacker can craft a malicious application that, when executed, causes the system to load a malicious dll instead of the intended legitimate one, thereby gaining elevated privileges.
The operational impact of CVE-2016-0016 is significant as it provides local attackers with a pathway to achieve privilege escalation without requiring remote network access or complex exploitation techniques. This vulnerability can be leveraged by malware or attackers who have already gained access to a system to elevate their privileges from standard user level to administrative rights, which would otherwise require more sophisticated attack vectors. The exploitability of this vulnerability is enhanced by the fact that it can be triggered through seemingly benign applications, making detection more challenging. The attack typically requires the attacker to place a malicious dll in a strategic location within the system's search path, such as the current working directory of an application or a directory that is searched before system directories. This vulnerability also has implications for security monitoring and incident response as it can be used to bypass security controls that rely on proper dll loading behavior, potentially allowing attackers to maintain persistence and avoid detection mechanisms that monitor for suspicious dll loading activities.
Mitigation strategies for CVE-2016-0016 should focus on both immediate patching and operational security enhancements. Microsoft released security updates that address the vulnerability by modifying the dll loading behavior and implementing stricter validation of the search paths used by the operating system. Organizations should prioritize applying the relevant security patches to all affected Windows systems, particularly those running the vulnerable versions mentioned in the CVE description. Additionally, implementing security measures such as enabling Windows Defender Application Control or AppLocker policies can help prevent unauthorized dll loading by restricting which applications and dlls can execute on the system. System administrators should also consider implementing the principle of least privilege and ensuring that applications run with minimal required permissions. Network segmentation and monitoring for unusual dll loading patterns can provide additional layers of defense, while regular security audits should verify that no malicious dll files have been placed in system directories or application search paths. The vulnerability demonstrates the importance of proper input validation and secure coding practices, particularly in system components that handle library loading and path resolution, aligning with security standards that emphasize secure development lifecycle practices and proper privilege management.