CVE-2024-27943 Siemens CVE debrief

Who should care

Organizations operating Siemens RUGGEDCOM CROSSBOW in industrial control system (ICS/OT) environments, particularly those in critical infrastructure sectors including energy, transportation, and manufacturing. Security teams responsible for network management systems and privileged access controls should prioritize this patch.

Technical summary

CVE-2024-27943 affects Siemens RUGGEDCOM CROSSBOW, a network management system for industrial communications. The vulnerability exists in the file upload functionality, which allows privileged users to upload generic files to the root installation directory. This path traversal weakness enables attackers with high privileges to replace specific system files, leading to file tampering or remote code execution. The CVSS 3.1 score of 7.2 (HIGH) reflects the significant impact despite the high privilege requirement. Siemens has released version 5.5 to address this vulnerability.

Defensive priority

HIGH

Recommended defensive actions

• Apply vendor fix by updating Siemens RUGGEDCOM CROSSBOW to version 5.5 or later
• Restrict privileged user access to file upload functionality to only authorized administrators
• Monitor root installation directory for unauthorized file modifications
• Implement file integrity monitoring on critical system files
• Review and audit privileged user activities on affected systems
• Apply network segmentation to limit exposure of RUGGEDCOM CROSSBOW management interfaces

Evidence notes

The vulnerability description is sourced from CISA CSAF advisory ICSA-24-137-10, which references Siemens security advisory SSA-916916. The CVSS 3.1 vector (AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H) indicates network attack vector with high privileges required, but high impact on confidentiality, integrity, and availability. The vendor fix remediation specifies update to V5.5 or later version.

Official resources