CVE-2018-8284 in .NET Framework
Summary
by MITRE
A remote code execution vulnerability exists when the Microsoft .NET Framework fails to validate input properly, aka ".NET Framework Remote Code Injection Vulnerability." This affects Microsoft .NET Framework 2.0, Microsoft .NET Framework 3.0, Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2, Microsoft .NET Framework 4.5.2, Microsoft .NET Framework 4.6, Microsoft .NET Framework 4.7/4.7.1/4.7.2, Microsoft .NET Framework 4.7.1/4.7.2, Microsoft .NET Framework 3.5, Microsoft .NET Framework 3.5.1, Microsoft .NET Framework 4.6/4.6.1/4.6.2, Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.1/4.7.2, Microsoft .NET Framework 4.7.2.
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Analysis
by VulDB Data Team • 04/05/2023
This vulnerability represents a critical remote code execution flaw in Microsoft's .NET Framework that stems from inadequate input validation mechanisms within the runtime environment. The vulnerability specifically affects multiple versions of the .NET Framework spanning from version 2.0 through the latest releases up to 4.7.2, creating a widespread attack surface across numerous enterprise environments. The flaw manifests when the framework fails to properly validate user-supplied input during processing operations, allowing malicious actors to inject arbitrary code that executes with the privileges of the affected application. This issue falls under CWE-20, which describes improper input validation, and aligns with ATT&CK technique T1059.001 for command and script injection, demonstrating how unvalidated input can lead to arbitrary code execution.
The technical exploitation of this vulnerability occurs through carefully crafted input that bypasses the framework's validation checks, enabling attackers to manipulate the execution flow of .NET applications. When applications built on affected .NET Framework versions process untrusted input without proper sanitization, attackers can leverage this weakness to execute malicious code remotely without requiring local system access. The impact extends beyond simple code execution as the vulnerability can be exploited to escalate privileges, access sensitive data, and potentially compromise entire application servers. This vulnerability particularly affects web applications, desktop applications, and services that rely on .NET Framework components, making it a prime target for attackers seeking persistent access to enterprise networks. The exploitation requires minimal privileges and can be automated through various attack vectors including web-based interfaces, file uploads, or API endpoints that process user input.
Organizations running affected .NET Framework versions face significant operational risks including potential data breaches, system compromise, and regulatory compliance violations. The widespread nature of .NET Framework deployments means that even organizations with strict security policies may be vulnerable if they have not applied the necessary patches. The vulnerability's remote exploitability eliminates the need for physical access or insider knowledge, making it particularly dangerous for cloud-hosted applications and services. Security teams must conduct comprehensive inventory assessments to identify all systems running affected .NET Framework versions, as the vulnerability can exist in both development and production environments. The risk assessment should consider not only direct application impacts but also indirect consequences such as supply chain attacks, credential theft, and potential lateral movement within network infrastructures.
Mitigation strategies should prioritize immediate patch deployment through Microsoft's security updates, specifically addressing the vulnerabilities in the affected .NET Framework versions. Organizations should implement network segmentation to limit exposure of .NET applications to untrusted networks, while also applying application-level input validation measures as defensive controls. The implementation of web application firewalls and intrusion detection systems can help detect and block exploitation attempts. Additionally, organizations should establish robust monitoring procedures to identify unusual application behavior that might indicate exploitation attempts. Regular security assessments and vulnerability scanning should be conducted to ensure all .NET Framework installations are properly patched and that no legacy versions remain in production. The remediation process must also include thorough testing of patched applications to prevent regression issues and ensure continued functionality. Organizations should also consider implementing runtime application self-protection measures and application whitelisting to reduce the attack surface and prevent unauthorized code execution.