CVE-2012-0163 in .NET Framework
Summary
by MITRE
Microsoft .NET Framework 1.0 SP3, 1.1 SP1, 2.0 SP2, 3.5, 3.5.1, 4, and 4.5 does not properly validate function parameters, which allows remote attackers to execute arbitrary code via (1) a crafted XAML browser application (aka XBAP), (2) a crafted ASP.NET application, or (3) a crafted .NET Framework application, aka ".NET Framework Parameter Validation Vulnerability."
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Analysis
by VulDB Data Team • 01/05/2025
The CVE-2012-0163 vulnerability represents a critical parameter validation flaw within Microsoft .NET Framework versions spanning from 1.0 SP3 through 4.5. This vulnerability stems from insufficient input validation mechanisms that fail to properly sanitize function parameters during execution. The flaw specifically affects the framework's handling of XAML browser applications, ASP.NET applications, and native .NET applications, creating multiple attack vectors for remote code execution. The vulnerability operates at the core of the framework's security model, where unvalidated parameters can be manipulated to bypass security boundaries and execute malicious code with elevated privileges. This issue directly relates to CWE-20, which describes improper input validation, and demonstrates how fundamental security controls can be compromised when parameter validation is inadequate.
The technical exploitation of this vulnerability occurs through the manipulation of function parameters in .NET Framework applications, particularly when processing XAML content or handling ASP.NET requests. Attackers can craft malicious XAML browser applications that, when executed in a browser environment, trigger the validation bypass and allow arbitrary code execution. Similarly, ASP.NET applications can be targeted through specially crafted requests that exploit the same parameter validation weaknesses. The vulnerability also extends to native .NET applications where the framework's parameter handling routines fail to properly validate input before processing. These attack vectors leverage the trust model inherent in .NET Framework applications, where legitimate code execution paths can be subverted through parameter manipulation. The exploitation requires minimal privileges and can result in complete system compromise, as the malicious code executes within the context of the affected application.
The operational impact of CVE-2012-0163 is severe and far-reaching across enterprise environments that utilize affected .NET Framework versions. Organizations running web applications, internal business systems, and desktop applications are all at risk when these vulnerable frameworks are present. The vulnerability can be exploited remotely without user interaction, making it particularly dangerous for publicly accessible web applications. Security teams face significant challenges in identifying all potentially affected systems, as the vulnerability spans multiple framework versions and application types. The impact extends beyond immediate code execution to include potential data breaches, system compromise, and lateral movement within networks. This vulnerability aligns with ATT&CK technique T1059, which covers command and scripting interpreter usage, and T1068, which addresses exploit for privilege escalation, making it a critical target for defensive measures.
Mitigation strategies for CVE-2012-0163 focus on immediate patching and application hardening measures. Microsoft released security updates addressing this vulnerability through the regular security bulletin process, requiring organizations to apply the appropriate framework updates. System administrators should prioritize patch deployment across all affected .NET Framework installations, particularly in production environments where web applications are hosted. Additional defensive measures include implementing network segmentation to limit access to vulnerable applications, disabling unnecessary XAML browser application functionality, and monitoring for suspicious application behavior. Organizations should also consider implementing application whitelisting policies to restrict execution of untrusted code and strengthen input validation controls within their applications. The vulnerability highlights the importance of maintaining current security patches and demonstrates how fundamental framework components require continuous security attention to prevent exploitation. Regular security assessments and vulnerability scanning should be implemented to identify any remaining vulnerable systems and ensure comprehensive protection against similar parameter validation issues.