CVE-2023-27246 in MK-Auth
Summary
by MITRE • 03/28/2023
An arbitrary file upload vulnerability in the Virtual Disk of MK-Auth 23.01K4.9 allows attackers to execute arbitrary code via uploading a crafted .htaccess file.
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Analysis
by VulDB Data Team • 11/16/2025
The vulnerability CVE-2023-27246 represents a critical arbitrary file upload flaw within the MK-Auth 23.01K4.9 virtual disk implementation that exposes systems to remote code execution attacks. This vulnerability specifically targets the authentication system's handling of file uploads, creating a pathway for malicious actors to gain unauthorized access and control over affected systems. The flaw manifests when the system fails to properly validate or sanitize file uploads, particularly those with .htaccess file extensions that are commonly used for web server configuration and access control.
The technical exploitation of this vulnerability leverages the inherent permissions and processing mechanisms within the MK-Auth virtual disk environment. When a crafted .htaccess file is uploaded, it can be processed by the web server in a manner that allows arbitrary code execution, effectively bypassing normal security boundaries. This type of vulnerability aligns with CWE-434 which specifically addresses insecure file upload handling, where the system accepts files without proper validation, potentially allowing attackers to upload malicious content that can be executed by the web server. The vulnerability demonstrates a classic lack of input validation and sanitization in the file upload process, where the system does not adequately verify the file type, content, or intended use of uploaded files.
The operational impact of this vulnerability extends beyond simple unauthorized access, as it provides attackers with the capability to execute arbitrary code on the target system. This allows for complete system compromise, data exfiltration, and potential lateral movement within network environments. The vulnerability affects systems using MK-Auth 23.01K4.9 virtual disk implementations, which are commonly deployed in enterprise environments for authentication and access control. The attack surface is particularly concerning as it can be exploited remotely without requiring prior authentication, making it an attractive target for automated exploitation campaigns. From an ATT&CK framework perspective, this vulnerability maps to techniques such as T1190 for exploiting vulnerabilities in web applications and T1059 for executing commands through compromised systems, demonstrating how a single vulnerability can enable multiple attack phases.
Mitigation strategies for CVE-2023-27246 must address both immediate remediation and long-term security hardening measures. Organizations should implement strict file type validation and content inspection mechanisms that prevent upload of potentially dangerous file extensions, particularly .htaccess files that can be executed by web servers. The system should enforce proper file name sanitization, implement Content Security Policies, and restrict upload directories to prevent execution of uploaded files. Additionally, access controls should be reviewed and strengthened to limit upload privileges to only authorized users. The vulnerability highlights the importance of proper input validation and the need for comprehensive security testing of file upload functionality. Regular security assessments and vulnerability scanning should be implemented to identify similar issues in other components of the authentication system. System administrators should also monitor for suspicious file upload activities and implement logging mechanisms that can detect and alert on potential exploitation attempts, as this vulnerability can be used as a foothold for more extensive attacks within the network infrastructure.