CVE-2016-10759
📋 TL;DR
This vulnerability in Precurio 2.1's Xinha plugin allows directory traversal attacks that can rename the .htaccess file, enabling attackers to upload and execute arbitrary PHP code. This leads to remote command execution on affected systems. Any organization running Precurio 2.1 with the Xinha plugin is vulnerable.
💻 Affected Systems
- Precurio
📦 What is this software?
Precurio by Precurio
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining full control over the server, data exfiltration, ransomware deployment, and lateral movement to other systems.
Likely Case
Remote code execution leading to web shell installation, data theft, and potential pivot to internal network resources.
If Mitigated
Attack blocked at perimeter with proper WAF rules and file upload restrictions, limiting impact to attempted exploitation logs.
🎯 Exploit Status
Exploitation requires access to the Xinha plugin interface but does not require administrative privileges. Public exploit code and detailed analysis are available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Later versions of Precurio (2.2+)
Vendor Advisory: https://blog.ripstech.com/2016/precurio-remote-command-execution-via-xinha-plugin/
Restart Required: No
Instructions:
1. Upgrade Precurio to version 2.2 or later. 2. Remove or disable the Xinha plugin if not required. 3. Apply vendor patches if available for version 2.1.
🔧 Temporary Workarounds
Disable Xinha Plugin
allRemove or disable the vulnerable Xinha plugin to prevent exploitation.
rm -rf /path/to/precurio/plugins/xinha/
mv /path/to/precurio/plugins/xinha/ /path/to/precurio/plugins/xinha.disabled/
Restrict .htaccess File Permissions
linuxSet immutable permissions on .htaccess files to prevent renaming.
chattr +i /path/to/precurio/.htaccess
chmod 444 /path/to/precurio/.htaccess
🧯 If You Can't Patch
- Implement strict WAF rules to block directory traversal patterns and PHP file uploads.
- Isolate the Precurio instance in a segmented network zone with strict outbound traffic controls.
🔍 How to Verify
Check if Vulnerable:
Check if Precurio version is 2.1 and Xinha plugin exists at /plugins/xinha/ExtendedFileManager/Classes/ExtendedFileManager.php.Check Version:
grep -r 'version' /path/to/precurio/config/ files or check admin interfaceVerify Fix Applied:
Verify Precurio version is 2.2+ or Xinha plugin is removed/disabled, and test directory traversal attempts are blocked.📡 Detection & Monitoring
Log Indicators:
- HTTP requests containing '../' patterns targeting ExtendedFileManager.php
- Unauthorized .htaccess file modification attempts
- Unexpected PHP file uploads in upload directories
Network Indicators:
- POST requests to /plugins/xinha/ExtendedFileManager/Classes/ExtendedFileManager.php with traversal payloads
- Outbound connections from Precurio server to unknown IPs post-exploitation
SIEM Query:
source="web_logs" AND (uri="*ExtendedFileManager.php*" AND (data="*../*" OR data="*.htaccess*"))