CVE-2018-7739
📋 TL;DR
CVE-2018-7739 is an authentication bypass vulnerability in antsle antman web management console that allows remote attackers to gain root access. Attackers can exploit insufficient input validation in the login process by injecting special characters in username/password parameters. This affects antsle antman versions before 0.9.1a.
💻 Affected Systems
- antsle antman
📦 What is this software?
Antman by Antsle
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with root-level access to the web management console, allowing full control over the antsle virtualization platform and hosted virtual machines.
Likely Case
Unauthorized access to the management console leading to data theft, service disruption, or deployment of malicious virtual machines.
If Mitigated
Limited impact if system is isolated from internet and has strict network segmentation, though authentication bypass still provides internal access.
🎯 Exploit Status
Multiple public exploit scripts available with simple HTTP POST requests containing crafted parameters.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.9.1a and later
Vendor Advisory: https://github.com/antsle/antman/releases
Restart Required: Yes
Instructions:
1. Backup current configuration. 2. Update antsle antman to version 0.9.1a or later. 3. Restart the antman service. 4. Verify authentication works correctly.
🔧 Temporary Workarounds
Network Isolation
linuxRestrict access to the antman web management console to trusted IP addresses only.
iptables -A INPUT -p tcp --dport [antman-port] -s [trusted-ip] -j ACCEPT
iptables -A INPUT -p tcp --dport [antman-port] -j DROP
Web Application Firewall
allDeploy WAF rules to block requests containing special characters in authentication parameters.
🧯 If You Can't Patch
- Disable the antman web management console interface entirely if not required
- Implement strict network segmentation and place the system in an isolated VLAN
🔍 How to Verify
Check if Vulnerable:
Check antman version: cat /opt/antman/version.txt or similar. If version is below 0.9.1a, system is vulnerable.Check Version:
cat /opt/antman/version.txt 2>/dev/null || echo 'Check antman installation directory'Verify Fix Applied:
Attempt authentication bypass with known exploit payloads. If login fails with invalid credentials, fix is likely applied.📡 Detection & Monitoring
Log Indicators:
- Failed login attempts with special characters in username/password fields
- Successful logins from unusual IP addresses
- ProcessBuilder execution errors in application logs
Network Indicators:
- HTTP POST requests to /login with URL-encoded special characters
- Multiple authentication attempts with varying parameter values
SIEM Query:
source="antman" AND (url="/login" AND (username="*%*" OR password="*%*"))🔗 References
- http://blog.codecatoctin.com/2018/02/antman-authentication-bypass.html
- https://www.exploit-db.com/exploits/44220/
- https://www.exploit-db.com/exploits/44262/
- http://blog.codecatoctin.com/2018/02/antman-authentication-bypass.html
- https://www.exploit-db.com/exploits/44220/
- https://www.exploit-db.com/exploits/44262/
