CVE-2024-31485 Overview
CVE-2024-31485 is a command injection vulnerability affecting Siemens CPCI85 Central Processing/Communication modules and the SICORE Base system. The web interface of these industrial devices fails to sanitize server-side input, allowing injection of arbitrary operating system commands. An authenticated attacker with high privileges can exploit the flaw remotely over the network to run code as root. The weakness is tracked under CWE-77 (Improper Neutralization of Special Elements used in a Command). Siemens addressed the issue in CPCI85 firmware V5.30 and SICORE Base system V1.3.0.
Critical Impact
Successful exploitation grants root-level code execution on affected industrial communication modules, giving attackers full control of critical infrastructure components.
Affected Products
- Siemens CPCI85 Central Processing/Communication (all versions before V5.30)
- Siemens SICORE Base system (all versions before V1.3.0)
- Deployments referenced in Siemens Security Advisory SSA-871704
Discovery Timeline
- 2024-05-14 - CVE-2024-31485 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2024-31485
Vulnerability Analysis
The defect resides in the web management interface exposed by CPCI85 and SICORE Base system devices. Input parameters submitted to the interface reach an operating system command handler without adequate server-side validation. Attackers can append shell metacharacters or additional commands to legitimate parameters. The web service runs with root privileges, so injected commands execute with the same authority. This class of flaw maps to CWE-77, improper command neutralization.
Exploitation requires authentication with high privileges, but no user interaction. The attack surface is network-facing where the web interface is reachable. EPSS forecasting places the vulnerability in a higher exploitation probability band than most CVEs, reflecting attacker interest in industrial control systems.
Root Cause
The application concatenates untrusted parameters into shell command strings without escaping or allow-list validation. Because the underlying service runs as root, any injected command inherits that privilege level. Client-side validation, where present, is bypassable by attackers who craft raw HTTP requests.
Attack Vector
A remote attacker authenticates to the web interface using a privileged account, either compromised or obtained through weak credential management. The attacker then submits a crafted HTTP request whose parameter contains shell separators such as ;, &&, or backticks followed by an operating system command. The device executes the payload as root, enabling firmware modification, lateral movement, or disruption of the industrial process. See the Full Disclosure mailing list post for public technical detail.
// Verified exploit code is not available.
// Refer to Siemens Security Advisory SSA-871704 for technical details.
Detection Methods for CVE-2024-31485
Indicators of Compromise
- Unexpected outbound connections initiated by CPCI85 or SICORE devices to non-engineering networks.
- Web server access logs containing shell metacharacters (;, |, `, $() inside parameter values.
- New or modified files in root-owned directories on the device following administrative sessions.
- Authentication events for privileged web accounts from unfamiliar source addresses.
Detection Strategies
- Deploy network intrusion detection signatures that flag HTTP requests to management endpoints containing shell control characters in POST or query parameters.
- Correlate privileged web logins with subsequent process creation or configuration changes on the device.
- Baseline normal engineering-workstation IP ranges and alert on management access from outside that scope.
Monitoring Recommendations
- Forward device syslog, web access logs, and authentication events to a centralized SIEM for retention and correlation.
- Monitor the operational technology (OT) segment for lateral movement attempts originating from communication modules.
- Alert on firmware version drift or unexpected reboots of CPCI85 and SICORE units.
How to Mitigate CVE-2024-31485
Immediate Actions Required
- Upgrade CPCI85 Central Processing/Communication to firmware V5.30 or later.
- Upgrade SICORE Base system to V1.3.0 or later.
- Rotate credentials for all privileged web interface accounts on affected devices.
- Restrict web interface exposure to trusted engineering workstations only.
Patch Information
Siemens released fixed versions addressing the input sanitization defect. Follow the remediation guidance in Siemens Security Advisory SSA-871704 and apply the vendor-supplied firmware images through the standard update procedure.
Workarounds
- Place affected devices behind a firewall that blocks all inbound traffic to the web management interface from untrusted networks.
- Enforce network segmentation between OT and IT environments per IEC 62443 recommendations.
- Require VPN or jump-host access with multi-factor authentication for any administrative session.
- Disable or limit privileged accounts to reduce the pool of identities that can exploit the flaw.
# Example firewall rule restricting web interface access to a management subnet
iptables -A INPUT -p tcp --dport 443 -s 10.10.20.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
