CVE-2025-3593: My-blog-layui RCE Vulnerability

CVE-2025-3593 Overview

A critical unrestricted file upload vulnerability has been identified in ZHENFENG13/code-projects My-Blog-layui version 1.0. This vulnerability affects the Upload function within the /admin/upload/authorImg/ endpoint. The manipulation of the File argument allows attackers to upload arbitrary files without proper validation, potentially leading to remote code execution on vulnerable systems.

Critical Impact

Attackers can remotely upload malicious files to the server, potentially gaining code execution capabilities and full system compromise.

Affected Products

• zhenfeng13 my-blog-layui version 1.0

Discovery Timeline

• April 14, 2025 - CVE-2025-3593 published to NVD
• October 10, 2025 - Last updated in NVD database

Technical Details for CVE-2025-3593

Vulnerability Analysis

This vulnerability is classified as an Unrestricted Upload of File with Dangerous Type (CWE-434) combined with Improper Access Control (CWE-284). The Upload function in My-Blog-layui fails to properly validate uploaded files, allowing attackers to bypass intended security restrictions. The vulnerability is network-accessible, meaning remote attackers can exploit it without physical access to the target system. While authentication is required (low privileges), no user interaction is necessary for exploitation, making it particularly dangerous in environments where the blog platform is exposed to untrusted users.

Root Cause

The root cause of CVE-2025-3593 lies in insufficient input validation within the file upload handling mechanism. The /admin/upload/authorImg/ endpoint accepts file uploads through the File parameter without properly checking file types, extensions, or content. This allows malicious actors to upload executable files such as web shells, PHP scripts, or other dangerous file types that can be executed by the web server.

Attack Vector

The attack is initiated remotely via the network. An authenticated attacker can craft a malicious HTTP request to the /admin/upload/authorImg/ endpoint, submitting a dangerous file through the File parameter. Upon successful upload, the attacker may be able to execute the uploaded file depending on the server configuration and web application architecture. The exploit has been publicly disclosed, and the vendor was contacted about this disclosure but did not respond.

The vulnerability mechanism involves the following flow: an attacker with low-level privileges accesses the author image upload functionality, submits a malicious file (such as a PHP web shell) instead of a legitimate image, and the server accepts the file without proper validation. Technical details and proof-of-concept information are available in the GitHub vulnerability documentation.

Detection Methods for CVE-2025-3593

Indicators of Compromise

• Unexpected files with executable extensions (.php, .jsp, .aspx) in the /admin/upload/authorImg/ directory or related upload directories
• HTTP POST requests to /admin/upload/authorImg/ containing suspicious file content or non-image MIME types
• Unusual process execution originating from the web server's upload directories
• Web access logs showing requests to newly uploaded files with executable extensions

Detection Strategies

• Monitor file system activity for newly created files in upload directories with dangerous extensions
• Implement web application firewall (WAF) rules to detect and block file upload attempts with executable content
• Configure intrusion detection systems to alert on suspicious HTTP POST payloads to the affected endpoint
• Review web server logs for anomalous requests to the /admin/upload/authorImg/ endpoint

Monitoring Recommendations

• Enable file integrity monitoring on web application upload directories
• Configure alerts for any files created with executable extensions in upload paths
• Monitor for outbound connections from the web server that may indicate a successful web shell deployment
• Implement centralized logging for all file upload activities and administrative actions

How to Mitigate CVE-2025-3593

Immediate Actions Required

• Restrict access to the /admin/upload/authorImg/ endpoint to trusted administrators only
• Implement strict file type validation on the server side, allowing only legitimate image formats (e.g., .jpg, .png, .gif)
• Consider disabling the affected upload functionality until a patch is available
• Audit existing uploaded files for any suspicious or unexpected content

Patch Information

No official patch is currently available from the vendor. According to the vulnerability disclosure, the vendor (zhenfeng13) was contacted about this issue but did not respond. Users are advised to implement workarounds and monitor for any future security updates. For more information, refer to VulDB entry #304648.

Workarounds

• Implement server-side file type validation checking both file extension and MIME type/magic bytes
• Configure the web server to prevent execution of uploaded files by disabling script execution in upload directories
• Rename uploaded files to remove original extensions and store original names in a database
• Consider implementing a content delivery approach that serves uploaded images through a separate, non-executable domain

# Example: Apache configuration to prevent script execution in upload directory
<Directory "/path/to/my-blog-layui/upload">
    # Disable script execution
    Options -ExecCGI
    php_admin_flag engine off
    
    # Only allow specific image MIME types
    <FilesMatch "\.(?i:php|phtml|php3|php4|php5|pl|cgi|asp|aspx|jsp)$">
        Require all denied
    </FilesMatch>
</Directory>