CVE-2020-18766
📋 TL;DR
CVE-2020-18766 is a cross-site scripting vulnerability in AntSword v2.0.7 that allows remote attackers to execute arbitrary system commands. This affects users running the vulnerable version of AntSword, a penetration testing tool. Attackers can exploit this to gain unauthorized access and control over affected systems.
💻 Affected Systems
- AntSword
📦 What is this software?
Antsword by Antsword Project
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining full control, data exfiltration, and lateral movement within the network.
Likely Case
Unauthorized command execution leading to data theft, system manipulation, and potential persistence mechanisms being installed.
If Mitigated
Limited impact with proper input validation and output encoding preventing successful exploitation.
🎯 Exploit Status
The vulnerability is well-documented in the GitHub issues with technical details that could be weaponized.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v2.0.8 and later
Vendor Advisory: https://github.com/AntSwordProject/antSword/issues/147
Restart Required: Yes
Instructions:
1. Download latest version from official AntSword repository. 2. Replace existing installation. 3. Restart AntSword service. 4. Verify version is v2.0.8 or higher.
🔧 Temporary Workarounds
Network Isolation
linuxRestrict access to AntSword interface to trusted IP addresses only
iptables -A INPUT -p tcp --dport [antSword-port] -s [trusted-ip] -j ACCEPT
iptables -A INPUT -p tcp --dport [antSword-port] -j DROP
Web Application Firewall
allDeploy WAF with XSS protection rules to filter malicious payloads
🧯 If You Can't Patch
- Disable or remove AntSword from production systems immediately
- Implement strict network segmentation to isolate AntSword instances
🔍 How to Verify
Check if Vulnerable:
Check AntSword version in web interface or configuration files for v2.0.7Check Version:
Check AntSword web interface or config.json for version informationVerify Fix Applied:
Verify version is v2.0.8 or higher and test XSS payloads are properly sanitized📡 Detection & Monitoring
Log Indicators:
- Unusual command execution patterns
- XSS payload patterns in HTTP requests
- Unauthorized access attempts to AntSword interface
Network Indicators:
- Traffic to AntSword default ports from unexpected sources
- Malicious JavaScript payloads in HTTP requests
SIEM Query:
source="antSword" AND (http_request CONTAINS "<script>" OR http_request CONTAINS "javascript:")