CVE-2024-27940: Siemens Ruggedcom Crossbow SQLi Vulnerability

CVE-2024-27940 Overview

CVE-2024-27940 is a SQL injection vulnerability [CWE-89] affecting Siemens RUGGEDCOM CROSSBOW versions prior to V5.5. The flaw permits any authenticated user to submit arbitrary SQL statements directly to the backend SQL server. Successful exploitation compromises the confidentiality, integrity, and availability of the entire database.

RUGGEDCOM CROSSBOW is a secure access management platform used in industrial and utility environments to broker administrative access to substation and field devices. A database compromise on this component exposes credentials, device inventories, and audit records that adversaries can leverage for lateral movement into operational technology (OT) networks.

Critical Impact
Authenticated attackers can execute arbitrary SQL against the CROSSBOW database, enabling full compromise of stored credentials, device configurations, and access records.

Affected Products

Siemens RUGGEDCOM CROSSBOW: All versions before V5.5
Component: siemens:ruggedcom_crossbow
Deployment context: industrial secure access management for OT environments

Discovery Timeline

2024-05-14 - CVE-2024-27940 published to NVD
2024-05-14 - Siemens ProductCERT publishes advisory SSA-916916
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2024-27940

Vulnerability Analysis

The vulnerability is a classic SQL injection flaw in RUGGEDCOM CROSSBOW. The application fails to properly separate user-supplied input from SQL query logic before forwarding statements to the SQL server. Any authenticated session can therefore issue arbitrary SQL commands with the privileges of the CROSSBOW database user.

Because CROSSBOW brokers access to networked field devices, the underlying database stores sensitive material such as device credentials, endpoint inventories, session logs, and role assignments. An attacker exploiting this flaw can read or modify this data, tamper with audit trails, and stage follow-on attacks against connected OT assets.

The issue requires only low-privilege authentication and no user interaction, and it is exploitable over the network path used to reach the CROSSBOW application. This makes it viable for insiders as well as external attackers who have obtained any valid CROSSBOW account through phishing, credential reuse, or prior compromise.

Root Cause

The root cause is improper neutralization of special elements used in SQL commands [CWE-89]. User-controlled input is concatenated into SQL queries rather than passed through parameterized statements or a strict allowlist, allowing SQL metacharacters to alter query structure.

Attack Vector

Exploitation requires network reachability to the CROSSBOW application and a valid authenticated session with any privilege level. The attacker submits crafted input through an affected application interface, and the injected SQL is executed by the backend database engine. Refer to the Siemens Security Advisory SSA-916916 for vendor-specific technical detail.

No public proof-of-concept exploit code has been published, and the issue is not listed in the CISA Known Exploited Vulnerabilities catalog.

Detection Methods for CVE-2024-27940

Indicators of Compromise

Unexpected SQL syntax, comment sequences (--, /* */), or UNION SELECT fragments in CROSSBOW application logs
Database queries originating from the CROSSBOW service account that reference system tables such as sysobjects, information_schema, or sys.databases
Anomalous read or export activity against tables holding device credentials or user records
Authenticated CROSSBOW sessions issuing high volumes of malformed requests in short intervals

Detection Strategies

Enable verbose application and database auditing on the CROSSBOW SQL backend and forward events to a central analytics platform.
Baseline the normal set of SQL statements issued by the CROSSBOW service account and alert on deviations, especially DDL or cross-database queries.
Deploy database activity monitoring or a web application firewall in front of the CROSSBOW interface with signatures for common SQL injection payloads.

Monitoring Recommendations

Monitor authentication events for CROSSBOW accounts and correlate failed logins with subsequent successful sessions and error-heavy queries.
Track outbound connections from the CROSSBOW host to detect data exfiltration following database access.
Review privileged use of the CROSSBOW database account and alert on schema enumeration or bulk row exports.

How to Mitigate CVE-2024-27940

Immediate Actions Required

Upgrade RUGGEDCOM CROSSBOW to version V5.5 or later as directed by Siemens advisory SSA-916916.
Inventory all CROSSBOW accounts and disable or rotate credentials for unused, shared, or over-privileged users.
Restrict network access to the CROSSBOW management interface to a defined administrative subnet or jump host.
Rotate device and service credentials stored within CROSSBOW if compromise is suspected.

Patch Information

Siemens has released RUGGEDCOM CROSSBOW V5.5, which remediates CVE-2024-27940. Apply the update on all CROSSBOW server instances. Full remediation guidance is available in the Siemens Security Advisory SSA-916916.

Workarounds

Limit CROSSBOW access to trusted operators and enforce least-privilege role assignments until the patch is deployed.
Place CROSSBOW behind network segmentation controls consistent with IEC 62443 zone and conduit guidance for OT environments.
Enable multi-factor authentication for administrative access to reduce risk from credential compromise.
Increase logging retention and review frequency for CROSSBOW application and database logs during the exposure window.

bash

# Example: restrict inbound access to the CROSSBOW server to a management subnet
# (adjust interface, subnet, and port to match your environment)
iptables -A INPUT -p tcp --dport 443 -s 10.10.20.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP