CVE-2024-58313 in xbtitFM
Summary
by MITRE • 12/12/2025
xbtitFM 4.1.18 contains an insecure file upload vulnerability that allows authenticated attackers with administrative privileges to upload and execute arbitrary PHP code through the file_hosting feature. Attackers can bypass file type restrictions by modifying the Content-Type header to image/gif, adding GIF89a magic bytes, and using alternate PHP tags to upload web shells that execute system commands.
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Analysis
by VulDB Data Team • 12/30/2025
The vulnerability CVE-2024-58313 represents a critical insecure file upload flaw in xbtitFM version 4.1.18 that fundamentally compromises system security through improper input validation and restrictive bypass techniques. This vulnerability specifically affects the file_hosting feature within the application's administrative interface, creating a pathway for authenticated attackers to escalate their privileges and gain remote code execution capabilities. The flaw stems from inadequate validation of file types and content, allowing malicious actors to circumvent security controls through sophisticated manipulation techniques that exploit the application's trust in Content-Type headers and file signature validation mechanisms.
The technical exploitation of this vulnerability involves multiple layers of attack methodology that demonstrate advanced understanding of web application security bypass techniques. Attackers can manipulate the Content-Type header to appear as image/gif while embedding actual PHP code within the file payload, effectively bypassing standard file type restrictions. The inclusion of GIF89a magic bytes serves as a decoy signature that tricks the application's validation logic into accepting the malicious file as legitimate. Additionally, attackers employ alternate PHP tags such as <?php and <? to ensure compatibility across different server configurations, enabling successful execution of uploaded web shells that can perform arbitrary system commands. This multi-layered approach to bypassing security controls aligns with common attack patterns documented in the ATT&CK framework under the T1505.003 technique for Server-Side Includes and T1059.007 for Command and Scripting Interpreter.
The operational impact of this vulnerability extends far beyond simple code execution, creating a complete compromise scenario where attackers can establish persistent access to affected systems. Once a web shell is successfully uploaded and executed, adversaries can perform reconnaissance activities, escalate privileges, access sensitive data, and potentially use the compromised system as a launch point for lateral movement within network environments. The vulnerability's requirement for administrative privileges initially limits its exploitation scope but does not eliminate the severity of impact, as administrative accounts typically possess elevated permissions and access to critical system resources. This scenario particularly affects organizations using outdated or unpatched xbtitFM installations, where the administrative interface remains accessible and where privilege escalation through other means may have already occurred.
Organizations facing this vulnerability should implement immediate mitigation strategies that address both the root cause and potential exploitation vectors. The primary recommendation involves implementing strict file type validation that goes beyond Content-Type header inspection, including comprehensive MIME type checking and actual file signature verification using magic number detection. The application should enforce rigorous file extension validation combined with content-based verification to prevent the acceptance of files that appear to be images but contain executable code. Additionally, implementing proper file upload restrictions such as storing uploaded files outside the web root directory and removing write permissions from upload directories can significantly reduce the attack surface. Organizations should also consider implementing Web Application Firewall rules that monitor for suspicious file upload patterns and Content-Type header manipulations, aligning with CWE-434 standards for secure file upload handling and preventing the execution of uploaded files through proper access controls and privilege separation measures.