CVE-2007-5737 in Korean GHBoard
Summary
by MITRE
Unrestricted file upload vulnerability in component/upload.jsp in Korean GHBoard allows remote attackers to upload arbitrary files via unspecified vectors, probably involving a direct request.
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Analysis
by VulDB Data Team • 12/09/2024
The vulnerability described in CVE-2007-5737 represents a critical unrestricted file upload flaw within the Korean GHBoard web application's component/upload.jsp module. This type of vulnerability falls under the category of insecure file handling practices that can lead to severe security implications for web applications. The vulnerability allows remote attackers to bypass normal file upload restrictions and execute arbitrary code on the target system. The issue stems from insufficient validation of file types and content during the upload process, creating an attack vector that can be exploited without authentication. According to CWE-434, this vulnerability maps directly to unrestricted file upload weaknesses where the application accepts files without proper security checks, making it susceptible to malicious file execution. The attack typically involves sending a crafted request directly to the upload endpoint, potentially bypassing any client-side validation mechanisms that might be in place. The vulnerability is particularly dangerous because it can enable attackers to upload web shells, malicious scripts, or other harmful content that can then be executed by the web server.
The technical implementation of this vulnerability exploits the lack of proper input validation and sanitization within the upload.jsp component. Attackers can manipulate the file upload process by sending malicious files directly to the server without going through normal application workflows. This direct request approach bypasses typical security controls that might be implemented in the user interface or application logic. The vulnerability demonstrates poor security architecture practices where the application does not enforce strict file type validation, size limits, or content inspection mechanisms. The absence of proper file extension checking, MIME type validation, and content analysis creates multiple attack surfaces for exploitation. From an attack perspective, this vulnerability aligns with ATT&CK technique T1190 which describes the use of web shells and malicious file uploads to maintain persistent access to compromised systems. The vulnerability can be exploited through various vectors including direct HTTP requests, automated tools, or manual manipulation of upload parameters.
The operational impact of CVE-2007-5737 extends far beyond simple unauthorized file uploads. Successful exploitation can result in complete system compromise, allowing attackers to execute arbitrary commands, escalate privileges, and establish persistent backdoors. The vulnerability can lead to data breaches, system infiltration, and unauthorized access to sensitive information stored within the application. Organizations using affected versions of Korean GHBoard face significant risks including potential regulatory violations, financial losses, and reputational damage. The vulnerability can be exploited by attackers with minimal technical expertise, making it particularly dangerous in environments where security controls are weak. The impact is amplified when the web application runs with elevated privileges or has access to sensitive databases and system resources. Organizations may experience service disruption, data loss, and potential compliance violations under regulations such as gdpr, hipaa, or pci dss standards. The vulnerability also represents a significant risk to network infrastructure as it can serve as an initial access point for broader attacks within the network environment. Security teams must consider the potential for lateral movement and privilege escalation when assessing the impact of this vulnerability.
Mitigation strategies for CVE-2007-5737 require comprehensive security measures that address both the immediate vulnerability and broader architectural weaknesses. Organizations should implement strict file type validation by maintaining allowlists of permitted extensions and rejecting all others. The application must perform thorough content inspection beyond simple extension checking, including magic number validation and MIME type verification. Proper input sanitization and file name sanitization should be implemented to prevent directory traversal attacks and other related vulnerabilities. Access controls should be enforced to restrict upload functionality to authenticated users with appropriate privileges only. The upload directory should be configured with restricted permissions and separated from executable code directories to prevent accidental execution of uploaded files. Security patches and updates should be applied immediately to address known vulnerabilities in the Korean GHBoard application. Regular security testing including penetration testing and vulnerability scanning should be conducted to identify similar issues. Network segmentation and monitoring should be implemented to detect suspicious upload activities and unauthorized file access attempts. The implementation of web application firewalls and intrusion detection systems can provide additional layers of protection against exploitation attempts. Organizations should also establish proper incident response procedures to quickly address any exploitation attempts and minimize potential damage from successful attacks.