CVE-2024-46890: Siemens Sinec INS RCE Vulnerability

CVE-2024-46890 Overview

CVE-2024-46890 is an OS command injection vulnerability [CWE-78] affecting Siemens SINEC INS, a network management platform used in industrial environments. The flaw exists in specific endpoints of the application's web API, which fail to properly validate user-supplied input. An authenticated remote attacker holding high privileges on the application can leverage this weakness to execute arbitrary operating system commands on the underlying host. All versions of SINEC INS prior to V1.0 SP2 Update 3 are affected. Siemens has published advisory SSA-915275 documenting the issue and the corresponding fix.

Critical Impact

Successful exploitation grants arbitrary code execution on the underlying OS, allowing attackers to compromise the SINEC INS host and pivot deeper into operational technology networks.

Affected Products

• Siemens SINEC INS — all versions prior to V1.0 SP2 Update 3
• Siemens SINEC INS V1.0, V1.0 SP1, V1.0 SP2
• Siemens SINEC INS V1.0 SP2 Update 1 and V1.0 SP2 Update 2

Discovery Timeline

• 2024-11-12 - CVE-2024-46890 published to the National Vulnerability Database (NVD)
• 2024-11-13 - Last updated in NVD database

Technical Details for CVE-2024-46890

Vulnerability Analysis

SINEC INS (Infrastructure Network Services) is a Siemens product that consolidates network services such as DHCP, DNS, RADIUS, syslog, and firmware management for industrial networks. The vulnerability resides in web API endpoints that accept user-controlled parameters and pass them to OS-level command execution without sufficient sanitization. Because the affected endpoints require an authenticated session with high privileges, exploitation depends on either legitimate administrative access or prior credential compromise. Once those conditions are met, an attacker can break out of the intended command context and inject arbitrary shell commands. Execution occurs in the security context of the SINEC INS service account, which typically holds broad access to network management functions.

Root Cause

The root cause is improper neutralization of special elements used in an OS command [CWE-78]. Input received from specific web API endpoints is concatenated or passed into a system command invocation without strict allow-list validation or safe argument-passing APIs. Shell metacharacters such as ;, |, &, and backticks are not filtered, allowing command separation and chaining.

Attack Vector

The vulnerability is exploitable over the network against the SINEC INS web API. The attacker must first authenticate and possess high privileges in the application. The attacker then submits a crafted request to a vulnerable endpoint, embedding shell metacharacters within an input field that the backend forwards to the operating system. The injected commands run with the privileges of the SINEC INS process, which can be used to read sensitive configuration, modify network services, or establish persistence. No verified proof-of-concept exploit code is publicly available at this time. See the Siemens Security Advisory SSA-915275 for vendor-confirmed technical details.

Detection Methods for CVE-2024-46890

Indicators of Compromise

• Unexpected child processes spawned by the SINEC INS service, such as /bin/sh, bash, cmd.exe, or powershell.exe, indicating command injection execution.
• Outbound network connections originating from the SINEC INS host to unfamiliar IP addresses or download utilities (curl, wget) invoked by the application process.
• Web API requests containing shell metacharacters (;, |, &, `, $() in parameters submitted to administrative endpoints.

Detection Strategies

• Inspect web server and application logs for authenticated requests to administrative API endpoints containing unusual or encoded shell metacharacters.
• Monitor process lineage on the SINEC INS host for shell interpreters or system utilities spawned as children of the application service.
• Correlate high-privilege account activity with command-line process telemetry to identify abuse of legitimate administrative sessions.

Monitoring Recommendations

• Enable verbose audit logging on SINEC INS and forward logs to a centralized SIEM for retention and alerting.
• Alert on any new outbound connections or file writes from the SINEC INS service account outside of established baselines.
• Track authentication events for high-privileged SINEC INS accounts, particularly logins from new sources or outside maintenance windows.

How to Mitigate CVE-2024-46890

Immediate Actions Required

• Upgrade SINEC INS to version V1.0 SP2 Update 3 or later as published in Siemens advisory SSA-915275.
• Restrict network access to the SINEC INS web interface so that only authorized management workstations can reach it.
• Rotate credentials for all high-privileged SINEC INS accounts and enforce strong, unique passwords with multi-factor authentication where supported.

Patch Information

Siemens has released SINEC INS V1.0 SP2 Update 3 to remediate this vulnerability. Customers should consult the Siemens Security Advisory SSA-915275 for download links, upgrade procedures, and any product-specific guidance before applying the update in production environments.

Workarounds

• Limit SINEC INS administrative accounts to the minimum number of operators required, following least-privilege principles.
• Place the SINEC INS server behind network segmentation controls and a firewall, exposing the web API only to trusted management VLANs.
• Follow Siemens operational guidelines for industrial security, including the defense-in-depth practices referenced in the vendor advisory.

# Example: restrict access to SINEC INS web API using iptables
iptables -A INPUT -p tcp --dport 443 -s 10.10.20.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP