CVE-2024-7917 in DouPHP
Summary
by MITRE • 08/19/2024
A vulnerability, which was classified as critical, has been found in DouPHP 1.7 Release 20220822. Affected by this issue is some unknown functionality of the file /admin/system.php of the component Favicon Handler. The manipulation of the argument site_favicon leads to unrestricted upload. The attack may be launched remotely. The exploit has been disclosed to the public and may be used.
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Analysis
by VulDB Data Team • 08/21/2024
CVE-2024-7917 represents a critical unrestricted file upload vulnerability affecting DouPHP version 1.7 Release 20220822, specifically within the Favicon Handler component located in the /admin/system.php file. This vulnerability stems from inadequate input validation and sanitization mechanisms that fail to properly restrict file types and content when processing the site_favicon parameter. The flaw allows attackers to upload malicious files without proper authorization, creating a significant security risk for affected systems. The vulnerability is classified as critical due to its remote exploitability and the potential for arbitrary code execution or full system compromise. The issue falls under CWE-434 Unrestricted Upload of File with Dangerous Type, which is a well-documented weakness in web applications where user-supplied files are not properly validated before being stored or executed. The ATT&CK framework categorizes this as a File Upload technique under the T1197 technique, where adversaries leverage web application vulnerabilities to upload malicious files that can be executed on the server. The attack vector is remote, meaning that exploitation does not require physical access to the target system, making it particularly dangerous for web applications that are publicly accessible. When an attacker successfully exploits this vulnerability, they can upload web shells, malicious scripts, or other harmful file types that can be executed by the web server, potentially leading to complete system compromise, data exfiltration, or further network infiltration. The disclosure of the exploit to the public significantly increases the risk of widespread exploitation, as malicious actors can immediately leverage this vulnerability against unpatched systems. This vulnerability directly impacts the integrity and availability of the web application, as it allows unauthorized modification of the system's file structure and execution environment.
The technical implementation of this vulnerability occurs when the application processes the site_favicon parameter without adequate validation of the uploaded file's MIME type, file extension, or content. The Favicon Handler component appears to accept file uploads without proper restrictions, allowing attackers to submit files with extensions such as .php, .jsp, .asp, or other executable formats. This lack of proper file validation creates a pathway for attackers to bypass security controls and execute arbitrary code on the server. The vulnerability is particularly concerning because favicon files are typically expected to be small image files with specific formats such as .ico, .png, or .gif, but the application fails to enforce these restrictions. The absence of proper content type checking, file size limits, and extension validation creates multiple attack surfaces for malicious file uploads. The exploitation process involves crafting a malicious file with a valid favicon extension but containing malicious code, which is then uploaded through the vulnerable parameter. This flaw demonstrates a fundamental weakness in the application's security architecture and input handling mechanisms. The vulnerability's impact extends beyond simple file upload capabilities, as successful exploitation can lead to persistent backdoors, data theft, service disruption, and lateral movement within the network. The lack of proper file validation also means that attackers can upload files that bypass standard security scanning mechanisms, making detection more difficult and increasing the potential for long-term system compromise.
Organizations utilizing DouPHP 1.7 Release 20220822 must implement immediate mitigations to address this critical vulnerability. The primary remediation involves implementing strict file validation controls that enforce proper MIME type checking, file extension restrictions, and content verification for all file upload operations. The application should reject any file that does not conform to predefined acceptable formats and sizes, with additional checks for file content to prevent file type confusion attacks. Security measures should include implementing a whitelist approach for allowed file types, ensuring that only legitimate favicon formats are accepted. Additionally, uploaded files should be stored in a separate directory with restricted permissions, and files should be renamed to prevent predictable paths. The system should also implement proper input sanitization and validation for the site_favicon parameter, including length limits, character set restrictions, and comprehensive content analysis. Organizations should also consider implementing web application firewalls to detect and block malicious upload attempts, and conduct regular security assessments to identify similar vulnerabilities in other application components. The mitigation strategy should align with industry standards such as OWASP Top Ten 2021's A01:2021 - Broken Access Control and A04:2021 - Insecure Design, which specifically address the need for proper input validation and secure file handling practices. Regular security updates and patches should be implemented immediately, and system administrators should monitor for any signs of exploitation attempts or unauthorized access to the application's file upload functionality. The vulnerability also highlights the importance of proper security testing during development and deployment phases to identify and remediate such critical flaws before they can be exploited by malicious actors in the wild.