CVE-2024-43687
📋 TL;DR
This is a stored cross-site scripting (XSS) vulnerability in Microchip TimeProvider 4100 banner configuration modules. Attackers can inject malicious scripts that execute when users view the banner, potentially compromising user sessions or performing unauthorized actions. Affects TimeProvider 4100 versions from 1.0 through 2.4.6.
💻 Affected Systems
- Microchip TimeProvider 4100 Grandmaster
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal administrator credentials, hijack sessions, install malware on administrator systems, or pivot to internal network resources.
Likely Case
Session hijacking, credential theft, or defacement of the management interface.
If Mitigated
Limited to banner interface only with no access to underlying system functions.
🎯 Exploit Status
Requires authentication to access banner configuration, but XSS payloads are simple to craft once authenticated.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.4.7
Restart Required: Yes
Instructions:
1. Download firmware version 2.4.7 from Microchip support portal. 2. Backup current configuration. 3. Apply firmware update via web interface or CLI. 4. Reboot device. 5. Verify version shows 2.4.7.
🔧 Temporary Workarounds
Restrict Banner Configuration Access
allLimit access to banner configuration interface to only necessary administrators using network controls.
Input Validation at Proxy
allImplement web application firewall or reverse proxy with XSS filtering for banner configuration endpoints.
🧯 If You Can't Patch
- Isolate TimeProvider management interface to separate VLAN with strict access controls.
- Implement browser security headers (Content-Security-Policy) via reverse proxy to mitigate XSS impact.
🔍 How to Verify
Check if Vulnerable:
Check web interface version under System > About. If version is between 1.0 and 2.4.6 inclusive, system is vulnerable.Check Version:
Via web interface: System > About page. Via CLI: show versionVerify Fix Applied:
After patching, verify version shows 2.4.7 and test banner configuration with basic XSS payloads like <script>alert('test')</script> to confirm sanitization.📡 Detection & Monitoring
Log Indicators:
- Unusual banner configuration changes
- Multiple failed login attempts followed by banner updates
- Script tags or JavaScript in banner configuration logs
Network Indicators:
- HTTP requests containing script tags to banner configuration endpoints
- Unusual outbound connections from administrator workstations after banner access
SIEM Query:
source="timeprovider_logs" AND (event="banner_config" AND (message="*script*" OR message="*javascript*" OR message="*onload*"))