CVE-2018-8540 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 4.6, Microsoft .NET Framework 3.5, Microsoft .NET Framework 4.7/4.7.1/4.7.2, 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 3.5.1, Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2, Microsoft .NET Framework 4.5.2, Microsoft .NET Framework 4.7.1/4.7.2, Microsoft .NET Framework 4.7.2, Microsoft .NET Framework 4.6.2.
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
Analysis
by VulDB Data Team • 06/18/2023
The vulnerability identified as CVE-2018-8540 represents a critical remote code execution flaw within Microsoft .NET Framework implementations that stems from inadequate input validation mechanisms. This weakness specifically manifests when the framework fails to properly validate user-supplied data during processing operations, creating a pathway for malicious actors to inject arbitrary code into affected systems. The vulnerability affects multiple versions of the .NET Framework spanning from version 3.5 through the latest 4.7.2 releases, indicating a widespread impact across the framework's evolutionary timeline. Security researchers have categorized this issue under the Common Weakness Enumeration (CWE) category CWE-20, which specifically addresses improper input validation vulnerabilities that can lead to various injection attacks.
The technical exploitation of this vulnerability occurs through the manipulation of input parameters that the .NET Framework processes without adequate sanitization or validation checks. Attackers can leverage this flaw by crafting malicious input sequences that bypass the framework's validation mechanisms, ultimately allowing them to execute arbitrary code on the target system with the privileges of the affected application. The vulnerability's remote nature means that attackers do not require local system access to exploit the flaw, making it particularly dangerous in networked environments where .NET applications are deployed. This type of attack aligns with the MITRE ATT&CK framework's technique T1203, which covers legitimate credentials and remote service access through exploitation of software vulnerabilities.
The operational impact of CVE-2018-8540 extends beyond simple code execution, as successful exploitation can lead to complete system compromise and unauthorized access to sensitive data. Organizations running applications built on affected .NET Framework versions face significant risk of data breaches, system infiltration, and potential lateral movement within their network infrastructure. The widespread nature of affected versions means that numerous enterprise applications and services could be vulnerable, particularly those relying on legacy .NET implementations. This vulnerability particularly affects web applications, desktop applications, and server-side components that utilize Microsoft's .NET Framework for their core functionality.
Mitigation strategies for this vulnerability require immediate attention from system administrators and security teams. Microsoft has released security patches and updates that address the input validation flaws in affected framework versions, and organizations must prioritize the deployment of these patches across all affected systems. Additionally, network segmentation and firewall rules can provide temporary protection by limiting access to vulnerable applications and services. Implementing proper input validation at application level can serve as an additional defense layer, though this approach should not replace the official vendor patches. Security monitoring should be enhanced to detect anomalous behavior that might indicate exploitation attempts, and regular vulnerability assessments should be conducted to identify any remaining unpatched systems within the organization's infrastructure.