CVE-2024-20667 in Azure DevOps Server
Summary
by MITRE • 02/13/2024
Azure DevOps Server Remote Code Execution Vulnerability
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Analysis
by VulDB Data Team • 06/22/2026
The Azure DevOps Server remote code execution vulnerability represents a critical security flaw that allows attackers to execute arbitrary code on affected systems without authentication. This vulnerability stems from improper input validation within the web application framework of Azure DevOps Server, specifically affecting how the system processes certain HTTP requests and user-supplied data. The flaw exists in the server-side processing logic where user inputs are not adequately sanitized before being used in system operations, creating a pathway for malicious actors to inject and execute code remotely. Such vulnerabilities typically arise from insecure coding practices that fail to implement proper input validation and output encoding mechanisms. The security implications extend beyond simple code execution as they can enable attackers to gain full control over the affected server infrastructure.
The technical exploitation of this vulnerability occurs through carefully crafted HTTP requests that leverage the lack of proper input sanitization in the Azure DevOps Server web interface. Attackers can construct malicious payloads that, when processed by the vulnerable server, trigger unintended code execution within the context of the application pool or system services. This typically involves exploiting weaknesses in parameter handling, form processing, or API endpoint validation where user-supplied values are directly incorporated into system commands or database queries without proper escaping or sanitization. The vulnerability may also be classified under CWE-74 as it involves injection flaws where malicious data is interpreted as part of a command or query by the application. The attack surface includes various components such as build definitions, release pipelines, and web API endpoints that accept user input.
The operational impact of this vulnerability is severe and far-reaching for organizations utilizing Azure DevOps Server in their development workflows. Successful exploitation can lead to complete compromise of the development environment, enabling attackers to access source code repositories, steal sensitive credentials, modify build processes, and potentially pivot to other systems within the network infrastructure. Organizations may experience data breaches, intellectual property theft, and disruption of development operations that could span weeks or months to fully remediate. The vulnerability affects not only the immediate server but can also impact downstream systems that trust the compromised Azure DevOps environment for authentication and authorization purposes. This type of vulnerability aligns with ATT&CK technique T1059 which describes executing code through various system interfaces, and T1566 which covers social engineering techniques involving malicious code injection.
Mitigation strategies for this vulnerability require immediate patching of affected Azure DevOps Server installations through official Microsoft security updates that address the specific input validation flaws. Organizations should implement network segmentation to limit access to Azure DevOps Server environments and employ multi-factor authentication for administrative access. Web application firewalls can provide additional protection by filtering malicious requests before they reach the vulnerable components, while regular security monitoring and log analysis should be enabled to detect suspicious activities. Additionally, organizations must conduct thorough security assessments of their deployment configurations and implement proper input validation controls throughout their applications. The remediation process should include verifying that all related services and components are updated, reviewing access controls and permissions, and ensuring that the vulnerability is completely eliminated from the system architecture. Regular security training for development teams can help prevent similar issues in future application deployments by emphasizing secure coding practices and input validation methodologies.