CVE-2023-37482
📋 TL;DR
This vulnerability allows unauthenticated remote attackers to determine valid usernames on affected Siemens devices by analyzing login response time differences. Attackers can exploit this timing side-channel to enumerate valid user accounts, which could facilitate credential stuffing or targeted attacks. Siemens industrial control systems and network devices with vulnerable web server login functionality are affected.
💻 Affected Systems
- Siemens industrial control systems and network devices with vulnerable web server
⚠️ 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 enumerate all valid usernames, then perform credential stuffing or targeted attacks leading to unauthorized access, data theft, or system compromise.
Likely Case
Attackers identify valid administrative or service accounts, enabling focused brute-force attacks against those accounts.
If Mitigated
Attackers can enumerate usernames but cannot gain access due to strong passwords, account lockouts, or multi-factor authentication.
🎯 Exploit Status
Exploitation requires network access to login endpoint and ability to measure response time differences with precision.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Siemens advisory SSA-195895 for specific fixed versions
Vendor Advisory: https://cert-portal.siemens.com/productcert/html/ssa-195895.html
Restart Required: Yes
Instructions:
1. Check Siemens advisory SSA-195895 for affected products. 2. Apply vendor-provided firmware updates. 3. Restart affected devices after patching.
🔧 Temporary Workarounds
Implement network segmentation
allRestrict access to device login interfaces to trusted networks only
Enable account lockout policies
allConfigure account lockout after failed login attempts to mitigate brute-force attacks
🧯 If You Can't Patch
- Implement network access controls to restrict login endpoint access
- Monitor login attempts for unusual patterns and implement intrusion detection
🔍 How to Verify
Check if Vulnerable:
Test login endpoint with timing analysis tools; check device version against Siemens advisoryCheck Version:
Device-specific; typically via web interface or CLI commands per Siemens documentationVerify Fix Applied:
Verify firmware version matches patched version from Siemens advisory and retest timing differences📡 Detection & Monitoring
Log Indicators:
- Unusual volume of login attempts from single source
- Multiple failed logins for different usernames
Network Indicators:
- Repeated HTTP POST requests to login endpoint with varying usernames
- Consistent timing patterns in login requests
SIEM Query:
source_ip=* AND destination_port=80 OR 443 AND uri_path CONTAINS '/login' AND http_method='POST' AND count > threshold