CVE-2016-0148 in .NET Framework
Summary
by MITRE
Microsoft .NET Framework 4.6 and 4.6.1 mishandles library loading, which allows local users to gain privileges via a crafted application, aka ".NET Framework Remote Code Execution Vulnerability."
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Analysis
by VulDB Data Team • 07/13/2022
The vulnerability identified as CVE-2016-0148 represents a critical privilege escalation flaw within Microsoft .NET Framework versions 4.6 and 4.6.1 that stems from improper handling of library loading operations. This weakness enables local attackers to execute malicious code with elevated privileges, effectively bypassing standard security boundaries that typically protect system resources. The vulnerability manifests when the framework fails to properly validate and sanitize dynamic library loading operations, creating opportunities for malicious actors to manipulate the execution flow of legitimate applications.
The technical root cause of this vulnerability lies in the manner in which the .NET Framework processes assembly loading and resolution within the application domain. When applications attempt to load libraries dynamically, the framework's loading mechanism does not adequately verify the integrity and authenticity of the loaded assemblies. This flaw specifically impacts the assembly resolver component that governs how .NET applications locate and load required dependencies. Attackers can exploit this by crafting malicious assemblies that appear legitimate to the framework but contain malicious code designed to execute with elevated privileges.
From an operational impact perspective, this vulnerability creates a significant threat landscape for organizations running affected .NET Framework versions. Local attackers who already have access to a system can leverage this weakness to escalate their privileges from standard user level to administrative privileges without requiring additional authentication or exploitation vectors. The implications extend beyond simple privilege escalation as the vulnerability can be chained with other attack vectors to achieve full system compromise. The vulnerability affects Windows operating systems where these specific .NET Framework versions are installed, making it particularly concerning for enterprise environments where multiple applications depend on the framework.
The attack surface for CVE-2016-0148 encompasses any application that utilizes dynamic library loading functionality within the .NET Framework environment. This includes web applications, desktop applications, and services that rely on .NET Framework components. Security researchers have classified this vulnerability under CWE-427 Uncontrolled Search Path Element, which describes the improper handling of search paths during library loading operations. The vulnerability's classification aligns with ATT&CK technique T1068, which covers Local Port Forwarding and privilege escalation through system-level component manipulation.
Mitigation strategies for this vulnerability require immediate deployment of Microsoft security updates and patches that address the specific library loading flaw. Organizations should implement the latest .NET Framework updates from Microsoft that correct the assembly loading behavior and strengthen validation mechanisms. Additionally, system administrators should consider implementing application whitelisting policies that restrict which assemblies can be loaded dynamically within the framework. The principle of least privilege should be enforced by ensuring that applications run with minimal required permissions and that dynamic loading operations are restricted to trusted sources only. Regular security assessments and monitoring of system logs for suspicious assembly loading activities can help detect potential exploitation attempts. Organizations should also consider implementing endpoint detection and response solutions that can identify anomalous library loading behaviors indicative of this specific vulnerability.