CVE-2022-26929 in .NET Framework
Summary
by MITRE • 09/13/2022
.NET Framework Remote Code Execution Vulnerability.
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Analysis
by VulDB Data Team • 01/03/2025
The CVE-2022-26929 vulnerability represents a critical remote code execution flaw within the Microsoft .NET Framework that poses significant risks to enterprise environments relying on affected software stacks. This vulnerability stems from improper handling of certain data types during deserialization processes within the framework's runtime components. The flaw specifically affects versions of the .NET Framework that process serialized objects through insecure deserialization mechanisms, creating pathways for attackers to execute arbitrary code on targeted systems. The vulnerability is particularly concerning as it can be exploited remotely without authentication, making it an attractive target for automated attack campaigns targeting vulnerable infrastructure.
The technical exploitation of this vulnerability occurs through carefully crafted malicious payloads that leverage the deserialization process to trigger code execution. When the .NET Framework processes malformed serialized data, the runtime fails to properly validate input parameters, allowing attackers to inject malicious code that executes with the privileges of the affected application. This flaw operates at the core of the framework's object serialization and deserialization mechanisms, which are fundamental components used across numerous enterprise applications. The vulnerability is categorized under CWE-502, which specifically addresses "Deserialization of Untrusted Data" as a critical security weakness that enables attackers to manipulate object instantiation processes.
The operational impact of CVE-2022-26929 extends far beyond simple remote code execution, as it can lead to complete system compromise and data breaches within affected organizations. Attackers can leverage this vulnerability to establish persistent backdoors, escalate privileges, and move laterally through network environments. The remote nature of the exploit means that attackers can target vulnerable systems from anywhere on the internet, without requiring physical access or prior authentication credentials. Organizations running web applications, enterprise services, or any software that utilizes the affected .NET Framework versions face immediate risk, as the vulnerability affects common application patterns including web services, database applications, and enterprise software solutions. The flaw's impact is amplified by its ability to bypass standard security controls, as the malicious code executes within the legitimate application context, making detection more challenging for security monitoring systems.
Mitigation strategies for this vulnerability must be implemented immediately across all affected systems and include multiple layers of defensive measures. Organizations should prioritize applying Microsoft's security patches and updates as soon as they become available, as these address the core deserialization flaw in the .NET Framework. Network segmentation and firewall rules should be configured to restrict unnecessary access to .NET Framework applications, particularly those exposed to untrusted networks or internet-facing services. Implementing runtime application self-protection measures and application whitelisting can help prevent exploitation of the vulnerability even if other defenses fail. Security monitoring should be enhanced to detect unusual deserialization patterns and suspicious network traffic related to affected applications. Additionally, organizations should conduct comprehensive vulnerability assessments to identify all systems running vulnerable .NET Framework versions and establish incident response procedures specifically addressing this type of remote code execution threat. The vulnerability aligns with ATT&CK technique T1059.001 for command and scripting interpreter and T1566.001 for spearphishing attachment, indicating that exploitation typically involves automated attack frameworks and social engineering components that leverage the remote execution capability to establish persistent access to compromised systems.