CVE-2023-29635 in White-Jotter
Summary
by MITRE • 05/01/2023
File upload vulnerability in Antabot White-Jotter v0.2.2, allows remote attackers to execute malicious code via the file parameter to function coversUpload.
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Analysis
by VulDB Data Team • 12/11/2025
The CVE-2023-29635 vulnerability represents a critical file upload flaw in Antabot White-Jotter version 0.2.2 that exposes the application to remote code execution attacks. This vulnerability specifically targets the coversUpload function which processes file uploads through the file parameter, creating an attack surface where malicious actors can bypass normal file validation mechanisms. The flaw stems from insufficient input sanitization and validation of uploaded files, allowing attackers to upload potentially harmful content that can be executed within the application's context.
This vulnerability falls under the CWE-434 category, which specifically addresses "Unrestricted Upload of File with Dangerous Type," representing a well-known security weakness where applications fail to properly validate file types and content during upload processes. The attack vector leverages the function's lack of proper file extension checking, content type validation, and file size limitations, enabling adversaries to upload malicious files such as php shells, javascript payloads, or other executable content. The vulnerability is particularly concerning because it allows remote code execution without requiring authentication, making it accessible to any attacker who can reach the application's endpoint.
The operational impact of this vulnerability extends beyond simple code execution to encompass complete system compromise and data breach potential. When an attacker successfully uploads malicious code, they can gain persistent access to the server, potentially escalating privileges to execute arbitrary commands, steal sensitive data, or use the compromised system as a launch point for further attacks within the network. The vulnerability affects the application's integrity and availability, as attackers can modify or delete content, disrupt services, and establish backdoors for long-term access. This weakness also creates opportunities for attackers to leverage the compromised system for lateral movement and privilege escalation attacks, as outlined in the ATT&CK framework under T1059 for command and scripting interpreter and T1078 for valid accounts.
Mitigation strategies for CVE-2023-29635 should focus on implementing comprehensive input validation, restrictive file upload policies, and proper content verification mechanisms. Organizations must enforce strict file type restrictions, implement robust file content analysis, and utilize whitelisting approaches for accepted file extensions and MIME types. The application should validate file content through multiple methods including magic number checking, file signature validation, and sandboxed execution environments. Additionally, proper access controls, secure file storage mechanisms, and regular security assessments should be implemented to prevent similar vulnerabilities. The fix should include updating to a patched version of Antabot White-Jotter or implementing compensating controls such as web application firewalls, upload validation layers, and monitoring systems to detect and prevent unauthorized file uploads. Security teams should also consider implementing automated vulnerability scanning and continuous monitoring to identify and remediate similar weaknesses in other applications and systems throughout the organization's infrastructure.