CVE-2024-46886
📋 TL;DR
This vulnerability is an open redirect flaw in Siemens web servers where improper input validation allows attackers to redirect legitimate users to malicious URLs. Affected users must click a crafted link for exploitation to succeed. Siemens industrial control system devices with vulnerable web servers are impacted.
💻 Affected Systems
- Siemens SIMATIC, SINUMERIK, SINAMICS products with affected web servers
⚠️ 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
Users could be redirected to phishing sites that steal credentials or deliver malware, potentially leading to full system compromise if combined with other vulnerabilities.
Likely Case
Phishing attacks where users are tricked into visiting malicious sites that steal session cookies or credentials.
If Mitigated
Limited impact with proper user awareness training and network segmentation preventing access to malicious external sites.
🎯 Exploit Status
Exploitation requires user interaction (clicking a link) but no authentication. Attack complexity is low once a malicious link is crafted.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Varies by product - see Siemens advisory for specific fixed versions
Vendor Advisory: https://cert-portal.siemens.com/productcert/html/ssa-876787.html
Restart Required: Yes
Instructions:
1. Review Siemens advisory SSA-876787. 2. Identify affected products in your environment. 3. Apply vendor-provided updates for each affected product. 4. Restart devices as required. 5. Verify fixes are applied.
🔧 Temporary Workarounds
Network segmentation
allIsolate affected devices from untrusted networks and limit user access
User awareness training
allTrain users not to click suspicious links, especially in industrial control environments
🧯 If You Can't Patch
- Implement strict network segmentation to isolate affected devices from user networks
- Deploy web application firewall rules to block redirect patterns and monitor for exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check device versions against Siemens advisory SSA-876787. Use Siemens TIA Portal or device web interfaces to verify versions.Check Version:
Varies by device - typically through web interface or Siemens engineering toolsVerify Fix Applied:
Verify installed firmware/software versions match or exceed the patched versions listed in Siemens advisory.📡 Detection & Monitoring
Log Indicators:
- Unusual redirect patterns in web server logs
- Multiple failed redirect attempts
- Requests with suspicious URL parameters
Network Indicators:
- HTTP redirects to external domains from industrial devices
- Unusual outbound connections from ICS devices
SIEM Query:
source="web_server_logs" AND (url="*redirect=*" OR url="*url=*" OR url="*goto=*") AND dest_domain NOT IN (allowed_domains)