CVE-2022-29729
📋 TL;DR
This vulnerability affects Verizon 4G LTE Network Extender devices with a weak default admin password generation algorithm. Unauthenticated attackers can access generated passwords via the webUI login page, potentially gaining administrative control. All users of affected devices with default configurations are at risk.
💻 Affected Systems
- Verizon 4G LTE Network Extender
📦 What is this software?
4g Lte Network Extender Firmware by Verizon
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the network extender allowing attackers to intercept communications, modify device settings, or use the device as an entry point into the network.
Likely Case
Unauthorized administrative access to the network extender, enabling configuration changes, service disruption, or credential harvesting.
If Mitigated
Limited impact if strong custom passwords are already configured and default password generation is disabled.
🎯 Exploit Status
Exploitation requires network access to the device's web interface. The vulnerability is well-documented in public advisories.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.verizon.com/
Restart Required: No
Instructions:
1. Contact Verizon support for firmware updates. 2. Check Verizon's security advisories for patch availability. 3. Apply any available firmware updates through the device's administrative interface.
🔧 Temporary Workarounds
Change Default Admin Password
allImmediately change the default admin password to a strong, unique password that is not generated by the vulnerable algorithm.
Access webUI > Administration > Change Password
Restrict Network Access
allLimit access to the device's web interface to trusted networks only using firewall rules.
🧯 If You Can't Patch
- Change admin password immediately to a strong, unique password
- Disable remote administration if not required
- Implement network segmentation to isolate the device
🔍 How to Verify
Check if Vulnerable:
Access the device's webUI login page and check if default password generation is enabled or if weak passwords are in use.Check Version:
Check firmware version in device webUI under System Information or similar sectionVerify Fix Applied:
Verify that a strong custom password is set and cannot be guessed via the vulnerable algorithm.📡 Detection & Monitoring
Log Indicators:
- Multiple failed login attempts
- Successful admin login from unusual IP addresses
- Configuration changes from unauthorized users
Network Indicators:
- Unusual traffic to/from the network extender's administrative interface
- Port scanning targeting the device's web port
SIEM Query:
source="network_extender" AND (event_type="login_failure" OR event_type="admin_access")