CVE-2025-29420
📋 TL;DR
PerfreeBlog v4.0.11 contains a directory traversal vulnerability in the getThemeFilesByName function that allows attackers to read arbitrary files on the server. This affects all installations running the vulnerable version. Attackers can potentially access sensitive configuration files, source code, or other system files.
💻 Affected Systems
- PerfreeBlog
📦 What is this software?
Perfreeblog by Perfree
⚠️ Risk & Real-World Impact
Worst Case
Complete server compromise through reading sensitive files like configuration files containing database credentials, SSH keys, or other authentication secrets, potentially leading to full system takeover.
Likely Case
Information disclosure of sensitive files including configuration files, source code, and potentially user data stored in accessible directories.
If Mitigated
Limited impact with proper file permissions and web server configuration restricting access to sensitive directories.
🎯 Exploit Status
The vulnerability appears to be unauthenticated based on the CWE-22 classification and directory traversal nature. Exploitation requires minimal technical skill.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: No
Instructions:
No official patch available. Monitor PerfreeBlog GitHub repository or vendor channels for security updates. Consider upgrading to newer versions if available.
🔧 Temporary Workarounds
Input Validation and Sanitization
allImplement proper input validation to prevent directory traversal sequences like '../' in file name parameters
Modify getThemeFilesByName function to validate and sanitize input parameters
Web Server Configuration
allConfigure web server to restrict access to sensitive directories and files
Configure appropriate directory restrictions in nginx/apache configuration
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to block directory traversal patterns
- Restrict file system permissions to limit what the web server user can access
🔍 How to Verify
Check if Vulnerable:
Check if running PerfreeBlog v4.0.11. Test by attempting to access files outside the intended directory using traversal sequences.Check Version:
Check PerfreeBlog version in admin panel or configuration filesVerify Fix Applied:
Test that directory traversal attempts are blocked and return appropriate error responses.📡 Detection & Monitoring
Log Indicators:
- Multiple requests with '../' patterns in URL parameters
- Access attempts to sensitive file paths like /etc/passwd, configuration files
Network Indicators:
- HTTP requests containing directory traversal sequences in parameters
SIEM Query:
web.url:*../* AND (web.url:*passwd* OR web.url:*config* OR web.url:*env*)