CVE-2024-6592
📋 TL;DR
This CVE describes an authentication bypass vulnerability in WatchGuard's Single Sign-On system. Attackers can exploit incorrect authorization in protocol communication between the Authentication Gateway and SSO clients to bypass authentication mechanisms. This affects organizations using WatchGuard SSO on Windows and macOS platforms.
💻 Affected Systems
- WatchGuard Authentication Gateway
- WatchGuard Single Sign-On Client for Windows
- WatchGuard Single Sign-On Client for macOS
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of SSO-protected systems allowing unauthorized access to all applications and resources behind the SSO gateway.
Likely Case
Unauthorized access to enterprise applications and data through bypassed authentication, potentially leading to data theft or lateral movement.
If Mitigated
Limited impact if network segmentation, additional authentication layers, or monitoring detects anomalous authentication attempts.
🎯 Exploit Status
Exploitation requires network access to the SSO gateway and client communication, but no authentication is needed once the vulnerability is triggered.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Authentication Gateway: 12.10.3 or later; Windows SSO Client: 12.8 or later; macOS SSO Client: 12.5.5 or later
Vendor Advisory: https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2024-00014
Restart Required: Yes
Instructions:
1. Download updated versions from WatchGuard support portal. 2. Update Authentication Gateway first. 3. Update all SSO clients. 4. Restart all affected systems. 5. Verify communication is functioning properly.
🔧 Temporary Workarounds
Network Segmentation
allIsolate SSO gateway and clients from untrusted networks to reduce attack surface.
Multi-Factor Authentication
allImplement additional authentication factors for critical applications to add defense in depth.
🧯 If You Can't Patch
- Implement strict network access controls to limit who can communicate with SSO components.
- Enable detailed logging and monitoring for authentication events and investigate any anomalies immediately.
🔍 How to Verify
Check if Vulnerable:
Check version numbers of Authentication Gateway and SSO clients against affected versions listed in advisory.Check Version:
On Windows: Check program version in Control Panel > Programs and Features. On macOS: Check application version in About dialog or via terminal commands specific to the SSO client.Verify Fix Applied:
Confirm all components are updated to patched versions and test authentication flows work correctly.📡 Detection & Monitoring
Log Indicators:
- Failed authentication attempts followed by successful access without proper credentials
- Unusual authentication patterns or source IPs
- Protocol communication errors between gateway and clients
Network Indicators:
- Unencrypted or malformed authentication protocol traffic
- Authentication bypass attempts in network captures
SIEM Query:
source="watchguard_sso" AND (event_type="authentication" AND result="success" AND user="unknown" OR source_ip NOT IN allowed_networks)