CVE-2024-41978
📋 TL;DR
This vulnerability affects multiple Siemens industrial routers and allows authenticated remote attackers to forge 2FA tokens of other users by extracting sensitive information from log files. The issue impacts all versions below V8.1 of the listed RUGGEDCOM and SCALANCE devices. Attackers could potentially bypass two-factor authentication mechanisms.
💻 Affected Systems
- RUGGEDCOM RM1224 LTE(4G) EU (6GK6108-4AM00-2BA2)
- RUGGEDCOM RM1224 LTE(4G) NAM (6GK6108-4AM00-2DA2)
- SCALANCE M804PB (6GK5804-0AP00-2AA2)
- SCALANCE M812-1 ADSL-Router family
- SCALANCE M816-1 ADSL-Router family
- SCALANCE M826-2 SHDSL-Router (6GK5826-2AB00-2AB2)
- SCALANCE M874-2 (6GK5874-2AA00-2AA2)
- SCALANCE M874-3 (6GK5874-3AA00-2AA2)
- SCALANCE M874-3 3G-Router (CN) (6GK5874-3AA00-2FA2)
- SCALANCE M876-3 (6GK5876-3AA02-2BA2)
- SCALANCE M876-3 (ROK) (6GK5876-3AA02-2EA2)
- SCALANCE M876-4 (6GK5876-4AA10-2BA2)
- SCALANCE M876-4 (EU) (6GK5876-4AA00-2BA2)
- SCALANCE M876-4 (NAM) (6GK5876-4AA00-2DA2)
- SCALANCE MUM853-1 (A1) (6GK5853-2EA10-2AA1)
- SCALANCE MUM853-1 (B1) (6GK5853-2EA10-2BA1)
- SCALANCE MUM853-1 (EU) (6GK5853-2EA00-2DA1)
- SCALANCE MUM856-1 (A1) (6GK5856-2EA10-3AA1)
- SCALANCE MUM856-1 (B1) (6GK5856-2EA10-3BA1)
- SCALANCE MUM856-1 (CN) (6GK5856-2EA00-3FA1)
- SCALANCE MUM856-1 (EU) (6GK5856-2EA00-3DA1)
- SCALANCE MUM856-1 (RoW) (6GK5856-2EA00-3AA1)
- SCALANCE S615 EEC LAN-Router (6GK5615-0AA01-2AA2)
- SCALANCE S615 LAN-Router (6GK5615-0AA00-2AA2)
📦 What is this software?
Ruggedcom Rm1224 Lte\(4g\) Eu Firmware by Siemens
View all CVEs affecting Ruggedcom Rm1224 Lte\(4g\) Eu Firmware →
Ruggedcom Rm1224 Lte\(4g\) Nam Firmware by Siemens
View all CVEs affecting Ruggedcom Rm1224 Lte\(4g\) Nam Firmware →
Scalance M812 1 \(annex A\) Firmware by Siemens
View all CVEs affecting Scalance M812 1 \(annex A\) Firmware →
Scalance M812 1 \(annex B\) Firmware by Siemens
View all CVEs affecting Scalance M812 1 \(annex B\) Firmware →
Scalance M816 1 \(annex A\) Firmware by Siemens
View all CVEs affecting Scalance M816 1 \(annex A\) Firmware →
Scalance M816 1 \(annex B\) Firmware by Siemens
View all CVEs affecting Scalance M816 1 \(annex B\) Firmware →
Scalance M826 2 Shdsl Router Firmware by Siemens
View all CVEs affecting Scalance M826 2 Shdsl Router Firmware →
Scalance M874 3 3g Router \(cn\) Firmware by Siemens
View all CVEs affecting Scalance M874 3 3g Router \(cn\) Firmware →
Scalance M876 3 \(rok\) Firmware by Siemens
Scalance M876 4 \(eu\) Firmware by Siemens
Scalance M876 4 \(nam\) Firmware by Siemens
Scalance Mum853 1 \(a1\) Firmware by Siemens
Scalance Mum853 1 \(b1\) Firmware by Siemens
Scalance Mum853 1 \(eu\) Firmware by Siemens
Scalance Mum856 1 \(a1\) Firmware by Siemens
Scalance Mum856 1 \(b1\) Firmware by Siemens
Scalance Mum856 1 \(cn\) Firmware by Siemens
Scalance Mum856 1 \(eu\) Firmware by Siemens
Scalance Mum856 1 \(row\) Firmware by Siemens
View all CVEs affecting Scalance Mum856 1 \(row\) Firmware →
⚠️ Risk & Real-World Impact
Worst Case
An authenticated attacker could forge 2FA tokens for any user, gaining unauthorized access to administrative interfaces and potentially compromising the entire industrial network infrastructure.
Likely Case
An authenticated malicious insider or compromised account could forge 2FA tokens for other users, gaining elevated privileges and bypassing authentication controls.
If Mitigated
With proper log access controls and network segmentation, the impact is limited to authenticated users who can access log files, reducing the attack surface.
🎯 Exploit Status
Exploitation requires authenticated access to read log files containing sensitive 2FA token generation information.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: V8.1
Vendor Advisory: https://cert-portal.siemens.com/productcert/html/ssa-087301.html
Restart Required: Yes
Instructions:
1. Download firmware version V8.1 or later from Siemens support portal. 2. Backup current configuration. 3. Upload and install the new firmware via web interface or CLI. 4. Reboot the device. 5. Verify the firmware version is V8.1 or higher.
🔧 Temporary Workarounds
Restrict log file access
allLimit access to log files to only authorized administrators and implement strict access controls.
Implement network segmentation
allIsolate affected devices in separate network segments with strict firewall rules limiting access to management interfaces.
🧯 If You Can't Patch
- Implement strict access controls to limit who can authenticate to affected devices
- Monitor and audit access to log files for suspicious activity
- Consider replacing affected devices with updated models if patching is not feasible
🔍 How to Verify
Check if Vulnerable:
Check the firmware version via web interface (System > Device Information) or CLI using 'show version' command. If version is below V8.1, the device is vulnerable.Check Version:
show versionVerify Fix Applied:
After updating, verify firmware version is V8.1 or higher using the same methods. Check that sensitive 2FA token information is no longer present in log files.📡 Detection & Monitoring
Log Indicators:
- Unauthorized access attempts to log files
- Multiple failed 2FA attempts followed by successful authentication
- Log entries containing sensitive 2FA token generation information
Network Indicators:
- Unusual authentication patterns from single source to multiple user accounts
- Traffic patterns indicating log file access from unauthorized sources
SIEM Query:
source="industrial_router_logs" AND (event_type="log_access" OR message="*2FA*token*generation*")