CVE-2013-7380
📋 TL;DR
CVE-2013-7380 is a remote command injection vulnerability in Etherpad Lite's ep_imageconvert plugin that allows attackers to execute arbitrary commands on the server. This affects all Etherpad Lite installations using the vulnerable ep_imageconvert plugin version. The vulnerability is particularly dangerous because it can be exploited without authentication.
💻 Affected Systems
- Etherpad Lite
📦 What is this software?
Ep Imageconvert by Ep Imageconvert Project
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attackers to execute arbitrary commands with the privileges of the Etherpad Lite process, potentially leading to data theft, system takeover, or lateral movement within the network.
Likely Case
Remote code execution leading to installation of backdoors, cryptocurrency miners, or data exfiltration from the affected server.
If Mitigated
Limited impact if proper network segmentation, least privilege principles, and input validation are implemented, though the vulnerability still presents significant risk.
🎯 Exploit Status
The vulnerability is well-documented with public proof-of-concept code available, making exploitation straightforward for attackers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Update to latest Etherpad Lite version or remove ep_imageconvert plugin
Vendor Advisory: https://github.com/ether/etherpad-lite/security/advisories
Restart Required: Yes
Instructions:
1. Update Etherpad Lite to the latest version. 2. If using ep_imageconvert plugin, update it to the patched version. 3. Restart the Etherpad Lite service. 4. Verify the fix by testing the image conversion functionality.
🔧 Temporary Workarounds
Disable ep_imageconvert plugin
allRemove or disable the vulnerable ep_imageconvert plugin to eliminate the attack vector
npm uninstall ep_imageconvert
Remove ep_imageconvert from package.json and run npm install
Network isolation
linuxRestrict network access to Etherpad Lite instance to trusted networks only
iptables -A INPUT -p tcp --dport 9001 -s trusted_network -j ACCEPT
iptables -A INPUT -p tcp --dport 9001 -j DROP
🧯 If You Can't Patch
- Immediately disable or remove the ep_imageconvert plugin from all Etherpad Lite instances
- Implement strict network access controls to limit exposure and monitor for exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check if ep_imageconvert plugin is installed: npm list ep_imageconvertCheck Version:
npm list etherpad-lite && npm list ep_imageconvertVerify Fix Applied:
Verify ep_imageconvert plugin is removed or updated to patched version, and test image upload functionality📡 Detection & Monitoring
Log Indicators:
- Unusual command execution in system logs
- Image conversion requests with suspicious parameters
- Unexpected process spawns from Etherpad Lite
Network Indicators:
- HTTP POST requests to /p/:padId/upload with malicious payloads
- Outbound connections from Etherpad Lite server to suspicious IPs
SIEM Query:
source="etherpad.log" AND ("ep_imageconvert" OR "upload") AND (cmd.exe OR bash OR sh OR python)