CVE-2022-24408
📋 TL;DR
This vulnerability allows local attackers to escalate privileges to root on affected SINUMERIK industrial control systems. The sc SUID binary contains commands that can be abused to execute system commands or modify system files. This affects SINUMERIK MC and SINUMERIK ONE systems running vulnerable versions.
💻 Affected Systems
- SINUMERIK MC
- SINUMERIK ONE
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with root access, allowing attackers to modify industrial processes, disrupt operations, or install persistent malware.
Likely Case
Local privilege escalation leading to unauthorized administrative access, potentially enabling further lateral movement within the industrial network.
If Mitigated
Limited impact if proper network segmentation and access controls prevent local attacker access to vulnerable systems.
🎯 Exploit Status
Requires local access to the system. The vulnerability is in a SUID binary, making exploitation straightforward once local access is obtained.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: SINUMERIK MC: V1.15 SP1 or later, SINUMERIK ONE: V6.15 SP1 or later
Vendor Advisory: https://cert-portal.siemens.com/productcert/pdf/ssa-337210.pdf
Restart Required: Yes
Instructions:
1. Download the appropriate patch from Siemens support portal. 2. Apply the patch following Siemens installation instructions. 3. Restart the affected systems to complete the update.
🔧 Temporary Workarounds
Remove SUID bit from sc binary
linuxRemove the setuid permission from the vulnerable sc binary to prevent privilege escalation.
chmod u-s /path/to/sc
Restrict access to sc binary
linuxLimit execution of the sc binary to authorized users only.
chmod 750 /path/to/sc
chown root:authorized_group /path/to/sc
🧯 If You Can't Patch
- Implement strict access controls to prevent unauthorized local access to affected systems.
- Monitor for suspicious privilege escalation attempts and unauthorized use of the sc binary.
🔍 How to Verify
Check if Vulnerable:
Check the version of SINUMERIK software and verify if it's below the patched versions. Also check if sc binary has SUID bit set: ls -la /path/to/sc | grep '^...s'Check Version:
Consult Siemens documentation for version checking commands specific to SINUMERIK systems.Verify Fix Applied:
Verify the software version is V1.15 SP1 or later for SINUMERIK MC, or V6.15 SP1 or later for SINUMERIK ONE. Confirm sc binary no longer has SUID bit or has been patched.📡 Detection & Monitoring
Log Indicators:
- Unusual privilege escalation attempts
- Unauthorized execution of sc binary
- Changes to system files by non-root users
Network Indicators:
- Unusual network traffic from industrial control systems
- Attempts to access sc binary remotely if misconfigured
SIEM Query:
Process execution where parent process is non-root and child process gains root privileges via sc binary