CVE-2023-1105
📋 TL;DR
This vulnerability allows attackers to control file paths in FlatPress blog software, potentially leading to arbitrary file read or write operations. It affects all FlatPress installations prior to version 1.3 where users can submit file uploads or manipulate file parameters.
💻 Affected Systems
- FlatPress
📦 What is this software?
Flatpress by Flatpress
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution via file upload manipulation leading to complete system compromise
Likely Case
Arbitrary file read/write allowing sensitive data exposure or website defacement
If Mitigated
Limited impact with proper file permission restrictions and input validation
🎯 Exploit Status
Exploit details available in public bounty reports with working proof-of-concept
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.3
Vendor Advisory: https://github.com/flatpressblog/flatpress/commit/5d5c7f6d8f072d14926fc2c3a97cdd763802f170
Restart Required: No
Instructions:
1. Download FlatPress 1.3 or later from official repository. 2. Backup current installation. 3. Replace vulnerable files with patched versions. 4. Verify file permissions remain secure.
🔧 Temporary Workarounds
Disable file uploads
allTemporarily disable file upload functionality in FlatPress configuration
Edit fp-config.php and set file upload permissions to false
Web Application Firewall rules
allBlock malicious file path patterns in request parameters
Add WAF rules to detect and block path traversal patterns like ../, absolute paths
🧯 If You Can't Patch
- Implement strict input validation on all file-related parameters
- Restrict web server permissions to prevent file writes outside designated directories
🔍 How to Verify
Check if Vulnerable:
Check if FlatPress version is below 1.3 in admin panel or fp-config.phpCheck Version:
Check fp-config.php for version number or visit /fp-admin/ panelVerify Fix Applied:
Verify version is 1.3+ and test file upload functionality with malicious path inputs📡 Detection & Monitoring
Log Indicators:
- Unusual file path patterns in access logs
- Failed file write attempts outside expected directories
- Multiple file upload attempts with path traversal sequences
Network Indicators:
- HTTP requests containing ../ sequences in file parameters
- POST requests to file upload endpoints with manipulated paths
SIEM Query:
source="web_logs" AND (uri="*../*" OR params="*../*") AND dest_port=80🔗 References
- https://github.com/flatpressblog/flatpress/commit/5d5c7f6d8f072d14926fc2c3a97cdd763802f170
- https://huntr.dev/bounties/4089a63f-cffd-42f3-b8d8-e80b6bd9c80f
- https://github.com/flatpressblog/flatpress/commit/5d5c7f6d8f072d14926fc2c3a97cdd763802f170
- https://huntr.dev/bounties/4089a63f-cffd-42f3-b8d8-e80b6bd9c80f
