CVE-2022-20695
📋 TL;DR
This vulnerability allows unauthenticated remote attackers to bypass authentication controls on Cisco Wireless LAN Controllers by using crafted credentials. It affects Cisco WLC devices with a specific non-default configuration, potentially granting administrative access. Organizations using vulnerable Cisco WLC configurations are at risk.
💻 Affected Systems
- Cisco Wireless LAN Controller (WLC)
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the wireless network infrastructure, allowing attacker to reconfigure network settings, intercept traffic, deploy malicious firmware, and pivot to other network segments.
Likely Case
Unauthorized administrative access to WLC management interface, enabling network reconnaissance, configuration changes, and potential credential harvesting.
If Mitigated
Limited impact due to proper network segmentation, strong authentication controls, and monitoring that would detect anomalous login attempts.
🎯 Exploit Status
Exploitation requires knowledge of the specific vulnerable configuration and crafting of authentication credentials.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Multiple fixed versions available - refer to Cisco advisory
Vendor Advisory: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-wlc-auth-bypass-JRNhV4fF
Restart Required: Yes
Instructions:
1. Review Cisco advisory for affected versions. 2. Download and apply appropriate firmware update. 3. Reboot affected WLC devices. 4. Verify patch installation and functionality.
🔧 Temporary Workarounds
Remove vulnerable configuration
allDisable the specific non-default configuration that makes the device vulnerable
Refer to Cisco advisory for specific configuration removal commands
Network segmentation
allRestrict management interface access to trusted networks only
Configure ACLs to limit management interface access to authorized IP ranges
🧯 If You Can't Patch
- Implement strict network access controls to limit WLC management interface exposure
- Enable detailed authentication logging and implement SIEM alerts for failed/successful login attempts
🔍 How to Verify
Check if Vulnerable:
Check Cisco advisory for specific configuration requirements and verify if your WLC has the vulnerable configuration enabledCheck Version:
show versionVerify Fix Applied:
Verify firmware version is updated to patched version and vulnerable configuration is removed📡 Detection & Monitoring
Log Indicators:
- Multiple failed authentication attempts followed by successful login from unusual IP
- Administrative login from unexpected source IP
Network Indicators:
- Unusual management interface traffic patterns
- Authentication requests with malformed credentials
SIEM Query:
source_ip NOT IN (trusted_management_ips) AND (event_type="authentication_success" AND device_type="cisco_wlc")