CVE-2024-52321
📋 TL;DR
Multiple SHARP routers have an improper authentication vulnerability in their configuration backup function. Remote unauthenticated attackers can retrieve backup files containing sensitive information like credentials and network configurations. All users of affected SHARP router models are potentially impacted.
💻 Affected Systems
- SHARP routers (specific models not detailed in references)
⚠️ 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
Attackers obtain administrative credentials, network configurations, and sensitive data, leading to full network compromise, data theft, or router takeover.
Likely Case
Attackers harvest configuration files containing passwords and network details to facilitate further attacks or reconnaissance.
If Mitigated
Limited exposure if routers are behind firewalls or not internet-facing, reducing attack surface.
🎯 Exploit Status
Exploitation likely involves accessing a specific URL to download backup files without authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Firmware updates as per vendor advisory
Vendor Advisory: https://k-tai.sharp.co.jp/support/info/info083.html
Restart Required: Yes
Instructions:
1. Check SHARP support site for affected models. 2. Download latest firmware from vendor. 3. Upload and apply firmware update via router admin interface. 4. Reboot router.
🔧 Temporary Workarounds
Disable Remote Access
allPrevent external access to router admin interface.
Network Segmentation
allPlace routers in isolated network segments to limit exposure.
🧯 If You Can't Patch
- Block access to router backup endpoints via firewall rules.
- Monitor network traffic for unauthorized access attempts to router admin interfaces.
🔍 How to Verify
Check if Vulnerable:
Attempt to access router backup URL (e.g., /backup.cfg) without authentication; if file downloads, system is vulnerable.Check Version:
Check firmware version in router admin interface under System or Status.Verify Fix Applied:
After patching, repeat check; backup should require authentication or be disabled.📡 Detection & Monitoring
Log Indicators:
- Unauthenticated HTTP requests to backup-related URLs in router logs.
- Unusual download patterns from router IP.
Network Indicators:
- HTTP GET requests to paths like /backup, /config, or /cfg from untrusted sources.
SIEM Query:
source_ip=router_ip AND (url_path CONTAINS 'backup' OR url_path CONTAINS 'config') AND http_status=200