CVE-2016-1363
📋 TL;DR
A buffer overflow vulnerability in Cisco Wireless LAN Controller (WLC) Software allows remote attackers to execute arbitrary code via crafted HTTP requests. This affects WLC devices running vulnerable software versions, potentially giving attackers full control of affected systems.
💻 Affected Systems
- Cisco Wireless LAN Controller (WLC)
📦 What is this software?
Wireless Lan Controller Software by Cisco
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, lateral movement within network, and persistent backdoor installation.
Likely Case
Remote code execution allowing attackers to gain administrative access, intercept network traffic, or disrupt wireless services.
If Mitigated
Limited impact if proper network segmentation and access controls prevent exploitation attempts.
🎯 Exploit Status
Exploitation requires sending crafted HTTP requests to vulnerable WLC devices.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 7.4.140.0(MD) or 8.0.115.0(ED) and later
Vendor Advisory: http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160420-htrd
Restart Required: Yes
Instructions:
1. Download appropriate firmware from Cisco support portal. 2. Backup current configuration. 3. Upload and install patched firmware. 4. Reboot controller. 5. Verify successful upgrade.
🔧 Temporary Workarounds
Network Access Control
allRestrict HTTP access to WLC management interfaces to trusted networks only.
Configure ACLs on network devices to block untrusted HTTP traffic to WLC management IPs
🧯 If You Can't Patch
- Isolate WLC devices in separate VLAN with strict access controls
- Implement network monitoring for suspicious HTTP traffic to WLC management interfaces
🔍 How to Verify
Check if Vulnerable:
Check WLC software version via web interface or CLI command 'show sysinfo'Check Version:
show sysinfo | include Software VersionVerify Fix Applied:
Verify version is 7.4.140.0(MD) or higher for 7.x, or 8.0.115.0(ED) or higher for 8.x📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP requests to WLC management interface
- Multiple failed HTTP requests followed by successful exploitation
Network Indicators:
- HTTP traffic with unusual patterns or payloads directed at WLC management IPs
SIEM Query:
source_ip=* AND dest_ip=WLC_IP AND protocol=HTTP AND (uri_contains=* OR payload_size>threshold)