Critical Vulnerability Information Vulnerability Description Type: Unrestricted File Upload Affected File: profile.php Version: Library System Project V1.0 Affected Product Product Name: Library System Affected Version: V1.0 Download Link: GitHub Technical Details Root Cause 1. Insufficient File Upload Validation: - Bypasses restrictions in via the parameter. - Lacks validation for file extensions and content types. 2. Accessible Upload Path: - Files stored in web-accessible directories (e.g., ) without execution permission restrictions. Attack Vector 1. Local AntSword Webshell: - Uses AntSword client to connect and send malicious POST requests to execute commands. 2. Remote Command Execution: - Executes system commands and file operations via Webshell. POC (Proof of Concept) 1. POST Request to Upload AntSword Webshell: - Sample code and request headers detail how to upload a Webshell. 2. AntSword Connection Request: - Sample code demonstrates connecting to the Webshell via AntSron. 3. AntSword Client Configuration: - URL and password settings for connecting to the Webshell. Impact Full System Control: Ability to execute arbitrary system commands. Sensitive Data Exposure: Includes database credentials, cookies, etc. Privilege Escalation & Lateral Movement: Exploiting server vulnerabilities for privilege escalation or internal network attacks. Persistent Backdoor: Creation of additional backdoors to maintain long-term control. Mitigation Measures Immediate Fixes 1. Block Malicious Uploads: - Prohibit script uploads in web server configuration. 2. Block AntSword-Specific Requests: - Add WAF rules to intercept requests containing or parameters. Long-Term Solutions 1. Enhance File Upload Validation: - Whitelist validation: Allow only image uploads (e.g., , ). - Content inspection: Use extension to check magic numbers. - Random renaming: Use random filenames when storing uploaded files. 2. Restrict Directory Execution Permissions: - Set upload directory to non-executable (e.g., ). 3. Monitor Suspicious Requests: - Log requests containing dangerous functions. - Deploy tools to monitor file execution in web directories. Proof of Concept Screenshots Successful upload of AntSword Webshell. Execution of system commands via AntSword. ``` This information provides a detailed description, technical details, attack vectors, impact, and mitigation measures for the Unrestricted File Upload vulnerability in Library System Project V1.0.