CVE-2018-8202 in .NET Framework
Summary
by MITRE
An elevation of privilege vulnerability exists in .NET Framework which could allow an attacker to elevate their privilege level, aka ".NET Framework Elevation of Privilege 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
The CVE-2018-8202 vulnerability represents a critical elevation of privilege flaw within Microsoft's .NET Framework ecosystem that fundamentally compromises system security boundaries. This vulnerability stems from improper handling of security checks during the execution of managed code, specifically affecting multiple versions of the .NET Framework spanning from version 2.0 through the latest 4.7.2 releases. The flaw allows authenticated attackers with limited system access to escalate their privileges and gain unauthorized administrative rights, creating a significant attack surface that could lead to complete system compromise.
The technical root cause of this vulnerability lies in the insufficient validation of security contexts within the .NET Framework's runtime execution environment. When applications execute code that requires elevated privileges, the framework fails to properly enforce security boundaries, allowing malicious code to bypass normal access controls. This issue manifests particularly when applications utilize certain reflection APIs or dynamic code generation features that interact with the security subsystem. The vulnerability is classified under CWE-284 which specifically addresses improper access control, making it a direct violation of fundamental security principles that should prevent unauthorized privilege escalation. Attackers can exploit this weakness by crafting malicious code that leverages the flawed security checks to execute with elevated privileges.
The operational impact of CVE-2018-8202 extends beyond simple privilege escalation, as it can enable attackers to perform a wide range of malicious activities including data exfiltration, system modification, and persistent backdoor installation. Systems running affected .NET Framework versions become vulnerable to attacks that can originate from both local and remote execution contexts, making the attack surface particularly broad. Organizations with web applications, enterprise services, or any systems that rely on .NET Framework components face significant risk, as the vulnerability can be exploited through various attack vectors including web applications, email attachments, or malicious software downloads. The impact is particularly severe in environments where .NET Framework applications handle sensitive data or provide administrative functions, as the vulnerability can be leveraged to bypass security controls that should protect against unauthorized access.
Mitigation strategies for CVE-2018-8202 require immediate implementation of Microsoft's security patches and updates, as the vulnerability has been addressed through the regular security update cycle. Organizations should prioritize patching all affected .NET Framework versions and implement runtime monitoring to detect suspicious privilege escalation attempts. Security controls should include regular vulnerability assessments, application whitelisting, and monitoring for anomalous behavior that might indicate exploitation attempts. Additionally, organizations should consider implementing the principle of least privilege, ensuring that applications and users operate with minimal necessary permissions to reduce the potential impact of successful exploitation. The ATT&CK framework categorizes this vulnerability under privilege escalation techniques, specifically highlighting the use of application execution flaws to gain elevated system access. Organizations should also implement network segmentation and endpoint protection measures to limit the potential lateral movement that could occur if an attacker successfully exploits this vulnerability, as the elevated privileges gained through this flaw could enable comprehensive system compromise and data access.