CVE-2022-1034 in showdoc
Summary
by MITRE • 03/22/2022
There is a Unrestricted Upload of File vulnerability in ShowDoc v2.10.3 in GitHub repository star7th/showdoc prior to 2.10.4.
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Analysis
by VulDB Data Team • 03/25/2022
The vulnerability identified as CVE-2022-1034 represents a critical unrestricted file upload flaw in ShowDoc version 2.10.3 and earlier, affecting the widely used documentation management system. This vulnerability exists within the GitHub repository star7th/showdoc and specifically targets the file upload functionality that lacks proper validation mechanisms. The issue stems from insufficient input sanitization and access control measures that allow authenticated users to upload arbitrary files to the server without adequate restrictions. The vulnerability impacts the application's security posture by creating potential attack vectors for remote code execution and persistent malicious payload delivery.
The technical flaw manifests through the absence of proper file type validation and content verification within the upload handler component. Attackers can exploit this weakness by uploading malicious files such as php shells, javascript payloads, or other executable content that bypasses the application's intended security controls. The vulnerability is classified as CWE-434 Unrestricted Upload of File, which directly maps to the ATT&CK technique T1195.001 for Content Injection and T1059.007 for Command and Scripting Interpreter. The flaw allows for privilege escalation when authenticated users upload files, as the application processes these uploads without proper verification of file extensions, MIME types, or actual file content. This weakness enables attackers to potentially execute arbitrary code on the target server, leading to full system compromise.
The operational impact of CVE-2022-1034 extends beyond simple data exposure to encompass complete system compromise and persistent backdoor establishment. Attackers can leverage this vulnerability to gain unauthorized access to sensitive documentation, user credentials, and system resources. The vulnerability affects organizations using ShowDoc for collaborative documentation, making it particularly dangerous in enterprise environments where sensitive business information is stored. The attack surface includes not only the web application itself but also any underlying infrastructure that depends on the documentation system. This vulnerability can facilitate lateral movement within networks and enable attackers to establish persistent access through uploaded malware or reverse shells, significantly increasing the risk of prolonged unauthorized access and data exfiltration.
Mitigation strategies for CVE-2022-1034 should focus on immediate remediation through the installation of ShowDoc version 2.10.4 or later, which includes proper file validation and upload restrictions. Organizations should implement comprehensive file type validation using allowlists rather than denylists, enforce strict MIME type checking, and implement proper file content verification mechanisms. The security architecture should incorporate multiple layers of protection including web application firewalls, upload directory permissions restrictions, and regular security scanning of uploaded content. Additional protective measures include implementing least privilege access controls, monitoring upload activities, and establishing automated file analysis systems to detect malicious content. Organizations should also conduct regular security assessments of their documentation systems and ensure proper patch management processes are in place to prevent similar vulnerabilities from being introduced in future versions. The implementation of these controls aligns with security frameworks such as NIST SP 800-53 and ISO 27001 requirements for secure application development and file handling practices.