CVE-2022-25752
📋 TL;DR
This vulnerability affects Siemens SCALANCE industrial network switches. It allows unauthenticated remote attackers to brute-force session IDs and hijack existing administrative sessions due to insecure calculation of session IDs and nonces in the web server.
💻 Affected Systems
- SCALANCE X302-7 EEC
- SCALANCE X304-2FE
- SCALANCE X306-1LD FE
- SCALANCE X307-2 EEC
- SCALANCE X307-3
- SCALANCE X307-3LD
- SCALANCE X308-2
- SCALANCE X308-2LD
- SCALANCE X308-2LH
- SCALANCE X308-2LH+
- SCALANCE X308-2M
- SCALANCE X308-2M PoE
- SCALANCE X308-2M TS
- SCALANCE X310
- SCALANCE X310FE
- SCALANCE X320-1 FE
- SCALANCE X320-1-2LD FE
- SCALANCE X408-2
- SCALANCE XR324-12M
- SCALANCE XR324-12M TS
- SCALANCE XR324-4M EEC
- SCALANCE XR324-4M PoE
- SIPLUS NET SCALANCE X308-2
📦 What is this software?
Scalance Xr324 4m Poe Ts Firmware by Siemens
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of network infrastructure, allowing attacker to reconfigure switches, disrupt industrial operations, or pivot to other systems.
Likely Case
Unauthorized administrative access to switches, enabling network configuration changes, traffic interception, or denial of service.
If Mitigated
Limited impact if switches are isolated from untrusted networks and have strong access controls.
🎯 Exploit Status
The vulnerability description indicates brute-forcing is possible, suggesting relatively straightforward exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: V4.1 or later
Vendor Advisory: https://cert-portal.siemens.com/productcert/pdf/ssa-836527.pdf
Restart Required: Yes
Instructions:
1. Download firmware V4.1 or later from Siemens support portal. 2. Backup current configuration. 3. Upload new firmware via web interface or management tools. 4. Reboot device. 5. Restore configuration if needed.
🔧 Temporary Workarounds
Disable web interface
allDisable the vulnerable web server interface to prevent remote exploitation.
Configure via CLI: no ip http server
Or via web interface: disable HTTP/HTTPS services
Network segmentation
allRestrict access to switch management interfaces to trusted networks only.
Configure ACLs: access-list 1 permit trusted_network
Apply to management interface
🧯 If You Can't Patch
- Isolate affected switches in dedicated VLANs with strict firewall rules
- Implement multi-factor authentication for management access if supported
🔍 How to Verify
Check if Vulnerable:
Check firmware version via web interface or CLI command: show versionCheck Version:
show versionVerify Fix Applied:
Confirm firmware version is V4.1 or higher using show version command📡 Detection & Monitoring
Log Indicators:
- Multiple failed login attempts followed by successful login from different IP
- Unusual configuration changes from unexpected sources
Network Indicators:
- Brute-force patterns to switch web interface
- Management traffic from unauthorized networks
SIEM Query:
source_ip=switch_management_interface AND (event_type=authentication_failure > 10 within 1min OR event_type=configuration_change)