CVE-2017-8297
📋 TL;DR
CVE-2017-8297 is a critical path traversal vulnerability in Simple PHP File Manager that allows attackers to read arbitrary files on the server by manipulating directory traversal sequences. This affects all installations of simple-file-manager before 2017-04-26. The vulnerability is particularly dangerous because it requires no authentication and can be exploited remotely.
💻 Affected Systems
- simple-file-manager (Simple PHP File Manager)
📦 What is this software?
Simple File Manager by Simple File Manager Project
⚠️ Risk & Real-World Impact
Worst Case
Complete server compromise through reading sensitive files like /etc/passwd, configuration files, or database credentials, potentially leading to remote code execution or data exfiltration.
Likely Case
Unauthorized access to sensitive files, configuration disclosure, and potential privilege escalation by reading system files.
If Mitigated
Limited impact if proper file permissions are set and the application runs with minimal privileges, though sensitive information could still be exposed.
🎯 Exploit Status
Exploitation requires only basic HTTP knowledge and can be performed with simple curl commands or browser requests.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version from 2017-04-26 or later
Vendor Advisory: https://github.com/jcampbell1/simple-file-manager/commit/de52e7ee61a842d8fdf791f2a5b7c91b6c5cdb56
Restart Required: No
Instructions:
1. Download the patched version from GitHub. 2. Replace the vulnerable index.php file with the patched version. 3. Verify the fix by testing directory traversal attempts.
🔧 Temporary Workarounds
Disable or Remove Simple File Manager
allCompletely remove the vulnerable file manager if not essential
rm /path/to/simple-file-manager/index.php
Restrict Access with Web Server Rules
linuxUse web server configuration to block access to the vulnerable endpoint
# Apache: <Location /simple-file-manager> Deny from all </Location>
# Nginx: location /simple-file-manager { deny all; }
🧯 If You Can't Patch
- Implement strict input validation to filter directory traversal sequences (../, ..\)
- Run the application with minimal privileges and restrict file system access using chroot or containerization
🔍 How to Verify
Check if Vulnerable:
Attempt to access a file outside the web root using: curl 'http://target/simple-file-manager/index.php?action=download&file=../../../../etc/passwd'Check Version:
Check the file modification date of index.php or look for the commit hash in the file commentsVerify Fix Applied:
Test the same directory traversal attempt after patching - it should return an error or empty response instead of file contents.📡 Detection & Monitoring
Log Indicators:
- HTTP requests containing '..' or '../' sequences to index.php
- Unusual file access patterns from the file manager
Network Indicators:
- HTTP GET requests with directory traversal sequences in parameters
- Unexpected file downloads from the file manager endpoint
SIEM Query:
source="web_server_logs" AND uri="*index.php*" AND (query="*..%2F*" OR query="*../*")