CVE-2020-29597 in IncomCMS
Summary
by MITRE • 12/08/2020
IncomCMS 2.0 has a modules/uploader/showcase/script.php insecure file upload vulnerability. This vulnerability allows unauthenticated attackers to upload files into the server.
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Analysis
by VulDB Data Team • 11/24/2024
The vulnerability identified as CVE-2020-29597 affects IncomCMS version 2.0 and represents a critical insecure file upload flaw within the modules/uploader/showcase/script.php component. This vulnerability resides in the content management system's file handling mechanism, specifically within the showcase module's script execution path. The flaw permits unauthenticated attackers to bypass authentication requirements and execute arbitrary file uploads on the target server, creating a significant security risk for organizations utilizing this particular version of the CMS.
The technical implementation of this vulnerability stems from insufficient input validation and access control mechanisms within the file upload functionality. The script.php file fails to properly validate file types, extensions, or content, allowing attackers to upload malicious files such as web shells, scripts, or other harmful payloads. This weakness directly maps to CWE-434, which categorizes insecure file upload vulnerabilities where applications accept files without proper validation, and aligns with ATT&CK technique T1190, which describes the exploitation of vulnerabilities to gain initial access through web application attacks. The vulnerability exists due to inadequate sanitization of user-supplied data and lack of proper file type restrictions, enabling attackers to upload files with potentially dangerous extensions or content.
The operational impact of this vulnerability is severe and multifaceted, as it provides attackers with a direct path to execute arbitrary code on the affected server. Successful exploitation allows threat actors to establish persistent backdoors, gain remote command execution capabilities, and potentially escalate privileges within the system. The vulnerability affects the confidentiality, integrity, and availability of the web application and underlying infrastructure, as attackers can modify content, steal sensitive data, or disrupt services. Organizations using IncomCMS 2.0 may face data breaches, unauthorized access to sensitive information, and potential compromise of their entire web infrastructure. The unauthenticated nature of the attack means that any external party can exploit this vulnerability without requiring valid credentials, making it particularly dangerous for publicly accessible web applications.
Mitigation strategies for CVE-2020-29597 should focus on immediate remediation and long-term security enhancements. Organizations must first apply the latest security patches or updates provided by the IncomCMS vendor to address this specific vulnerability. Additionally, implementing strict file type validation, restricting upload directories, and configuring proper access controls are essential measures. Security professionals should deploy web application firewalls to monitor and block suspicious file upload attempts, while also implementing proper file extension filtering and content validation checks. The principle of least privilege should be enforced by ensuring upload directories have minimal necessary permissions, and all uploaded files should be scanned for malicious content before execution. Regular security assessments, including penetration testing and vulnerability scanning, should be conducted to identify similar weaknesses in the application architecture. Organizations should also consider implementing automated monitoring systems to detect unauthorized file upload activities and establish incident response procedures to address potential exploitation attempts.