CVE-2023-43650
📋 TL;DR
JumpServer's password reset verification code lacks rate limiting, allowing attackers to brute-force the 6-digit code within its 1-minute validity window. This vulnerability enables unauthorized password resets for any user account. All JumpServer instances with password reset functionality enabled are affected.
💻 Affected Systems
- JumpServer
📦 What is this software?
Jumpserver by Fit2cloud
Jumpserver by Fit2cloud
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of JumpServer bastion host leading to lateral movement into internal networks, credential theft, and persistent access to critical infrastructure.
Likely Case
Unauthorized password reset for administrative or high-privilege accounts, resulting in account takeover and potential data exfiltration.
If Mitigated
Limited impact with proper network segmentation and monitoring, though authentication bypass remains possible.
🎯 Exploit Status
Simple brute-force script can exploit this vulnerability. Public proof-of-concept exists in security advisories.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.28.20 or 3.7.1
Vendor Advisory: https://github.com/jumpserver/jumpserver/security/advisories/GHSA-mwx4-8fwc-2xvw
Restart Required: Yes
Instructions:
1. Backup current configuration and data. 2. Stop JumpServer services. 3. Update to version 2.28.20 (for v2.x) or 3.7.1 (for v3.x). 4. Restart JumpServer services. 5. Verify functionality.
🔧 Temporary Workarounds
Disable password reset functionality
allTemporarily disable the password reset feature to prevent exploitation
Modify JumpServer configuration to disable password reset functionality
🧯 If You Can't Patch
- Implement network-level rate limiting at firewall/WAF for password reset endpoints
- Enable detailed logging and monitoring for password reset attempts with alert thresholds
🔍 How to Verify
Check if Vulnerable:
Check JumpServer version: if below 2.28.20 (for v2.x) or below 3.7.1 (for v3.x), system is vulnerableCheck Version:
jumpserverctl version or check web interface admin panelVerify Fix Applied:
Verify version is 2.28.20 or higher (v2.x) or 3.7.1 or higher (v3.x). Test password reset with multiple failed attempts to confirm rate limiting is enforced.📡 Detection & Monitoring
Log Indicators:
- Multiple failed password reset verification attempts from single IP
- Successful password reset followed by unusual login patterns
Network Indicators:
- High volume of POST requests to /api/v1/authentication/password/reset/
- Brute-force patterns to verification code endpoints
SIEM Query:
source="jumpserver" AND (uri_path="/api/v1/authentication/password/reset/" OR event_type="password_reset") | stats count by src_ip | where count > 10