CVE-2024-23812: Siemens Sinec NMS RCE Vulnerability

CVE-2024-23812 Overview

CVE-2024-23812 is a command injection vulnerability in Siemens SINEC Network Management System (NMS), affecting all versions prior to V2.0 SP1. The application fails to properly neutralize special elements when creating a report, allowing an authenticated attacker to inject operating system commands. Successful exploitation grants execution of arbitrary commands on the underlying host with the privileges of the SINEC NMS service.

Critical Impact
An authenticated remote attacker can achieve arbitrary command execution on SINEC NMS servers, compromising confidentiality, integrity, and availability of network management infrastructure supporting industrial environments.

Affected Products

Siemens SINEC NMS (All versions < V2.0 SP1)
Siemens SINEC NMS V2.0 base release
Industrial network management deployments relying on SINEC NMS for monitoring and configuration

Discovery Timeline

2024-02-13 - CVE-2024-23812 published to the National Vulnerability Database (NVD)
2024-02-13 - Siemens publishes advisory SSA-943925
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2024-23812

Vulnerability Analysis

The vulnerability is classified as an OS command injection flaw [CWE-78]. SINEC NMS constructs commands using user-influenced input during report creation without properly neutralizing shell metacharacters. An attacker with valid low-privilege application credentials can supply crafted input that breaks out of the intended command context.

The issue affects the report generation workflow, which is exposed through the network-accessible management interface. Because SINEC NMS often runs with elevated service privileges on Windows hosts, injected commands execute with substantial system authority. This creates a pivot point into industrial network segments that SINEC NMS monitors.

Root Cause

The root cause is improper neutralization of special elements used in an OS command. Input consumed by the report creation function is concatenated into a command string passed to an underlying shell or command interpreter. Metacharacters such as ;, &, |, and backticks are not filtered or escaped, allowing attacker-supplied commands to be appended to the intended process invocation.

Attack Vector

Exploitation requires network access to the SINEC NMS web interface and valid authenticated credentials with permission to generate reports. The attacker submits a crafted parameter containing shell metacharacters and a secondary command payload during report creation. When the server processes the report request, the injected payload executes on the host operating system. No user interaction is required beyond the attacker's own authenticated session.

The vulnerability mechanism follows standard OS command injection patterns documented under CWE-78. See the Siemens Security Advisory SSA-943925 for vendor-specific technical details.

Detection Methods for CVE-2024-23812

Indicators of Compromise

Unexpected child processes spawned by the SINEC NMS service, particularly cmd.exe, powershell.exe, or shell interpreters launched from the NMS process tree
Report generation requests containing shell metacharacters such as ;, &&, |, or backticks in report parameters
Outbound network connections from the SINEC NMS host to unfamiliar destinations following report creation activity
New scheduled tasks, services, or user accounts created around the time of report generation events

Detection Strategies

Monitor process creation on SINEC NMS servers and alert on shell interpreters spawned by the NMS application service account
Inspect SINEC NMS application and web server logs for report creation requests containing suspicious characters or long encoded payloads
Correlate authentication events with report generation actions to identify anomalous or off-hours activity from low-privilege accounts

Monitoring Recommendations

Enable verbose audit logging on SINEC NMS and forward logs to a centralized SIEM for retention and analysis
Baseline normal report generation patterns and alert on deviations in frequency, source account, or parameter content
Monitor egress traffic from management servers, which should have limited outbound connectivity in a properly segmented industrial network

How to Mitigate CVE-2024-23812

Immediate Actions Required

Upgrade SINEC NMS to version V2.0 SP1 or later as directed by Siemens advisory SSA-943925
Restrict network access to the SINEC NMS management interface to trusted administrative networks only
Review and reduce report generation permissions to accounts that strictly require them
Rotate credentials for accounts with access to SINEC NMS following remediation

Patch Information

Siemens has released SINEC NMS V2.0 SP1 to address CVE-2024-23812. Administrators should follow the upgrade guidance published in Siemens advisory SSA-943925. Verify the installed version after patching and confirm that report generation input validation is enforced.

Workarounds

Apply network segmentation and firewall rules that restrict SINEC NMS access to authorized engineering workstations following Siemens operational guidelines for industrial security
Enforce the principle of least privilege for SINEC NMS accounts and remove report generation rights from users who do not require them
Deploy application-layer filtering or a reverse proxy that rejects requests containing shell metacharacters in report parameters until patching is complete
Increase monitoring of SINEC NMS host activity during the remediation window to detect any exploitation attempts

bash

# Example firewall rule restricting SINEC NMS management access
# Replace <MGMT_SUBNET> and <NMS_HOST> with environment-specific values
iptables -A INPUT -p tcp --dport 443 -s <MGMT_SUBNET> -d <NMS_HOST> -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -d <NMS_HOST> -j DROP