CVE-2024-21767
📋 TL;DR
CVE-2024-21767 allows remote attackers to bypass access controls on Commend WS203VICM intercom systems by sending specially crafted malicious requests. This affects organizations using vulnerable versions of the Commend WS203VICM intercom system, potentially allowing unauthorized access to intercom functionality.
💻 Affected Systems
- Commend WS203VICM
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of intercom system allowing unauthorized access control, audio/video interception, and potential lateral movement to connected systems.
Likely Case
Unauthorized access to intercom functions, potential eavesdropping on communications, and manipulation of door access controls.
If Mitigated
Limited impact with proper network segmentation and access controls, potentially only affecting isolated intercom functions.
🎯 Exploit Status
The vulnerability description suggests remote exploitation without authentication, indicating relatively simple exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Specific version not provided in references, but vendor has released security updates.
Vendor Advisory: https://clibrary-online.commend.com/en/cyber-security/security-advisories.html
Restart Required: Yes
Instructions:
1. Check vendor advisory for specific patch version. 2. Download firmware update from Commend support portal. 3. Apply firmware update following vendor instructions. 4. Restart the WS203VICM device. 5. Verify update was successful.
🔧 Temporary Workarounds
Network Segmentation
allIsolate WS203VICM systems from untrusted networks and internet access.
Access Control Lists
allImplement strict firewall rules to limit access to WS203VICM management interfaces.
🧯 If You Can't Patch
- Segment WS203VICM systems on isolated VLANs with no internet access
- Implement strict network access controls allowing only trusted IP addresses to communicate with WS203VICM systems
🔍 How to Verify
Check if Vulnerable:
Check device firmware version against vendor advisory. If version is older than patched version, system is vulnerable.Check Version:
Check device web interface or use vendor-specific CLI commands (vendor documentation required)Verify Fix Applied:
Verify firmware version matches or exceeds the patched version specified in vendor advisory.📡 Detection & Monitoring
Log Indicators:
- Unusual authentication attempts
- Unexpected configuration changes
- Multiple failed access attempts followed by successful access
Network Indicators:
- Unusual traffic patterns to WS203VICM management ports
- Requests with malformed parameters to intercom endpoints
SIEM Query:
source_ip="*" AND destination_port="[WS203VICM_PORT]" AND (http_method="POST" OR http_method="GET") AND (url_contains="malicious_pattern" OR parameter_contains="bypass")