PatchSiren cyber security CVE debrief

CVE-2024-39869 Siemens CVE debrief

CVE-2024-39869 is a medium-severity vulnerability (CVSS 6.5) affecting Siemens SINEMA Remote Connect Server, published on 2024-07-09. The vulnerability allows an authenticated attacker to upload a crafted certificate that results in a permanent denial-of-service condition. Recovery requires manual removal of the offending certificate. The attack vector is network-based with low attack complexity, requiring low privileges and no user interaction. Siemens has released a vendor fix in version V3.2 SP1 or later. CISA published advisory ICSA-24-193-01 on the same date as the CVE publication.

Vendor: Siemens
Product: SINEMA Remote Connect Server
CVSS: MEDIUM 6.5
CISA KEV: Not listed in stored evidence
Original CVE published: 2024-07-09
Original CVE updated: 2024-07-09
Advisory published: 2024-07-09
Advisory updated: 2024-07-09

Who should care

Organizations operating Siemens SINEMA Remote Connect Server for remote access to industrial control systems, particularly in critical infrastructure sectors. Security teams responsible for OT/ICS environments, network administrators managing remote connectivity solutions, and incident response teams supporting industrial automation environments should prioritize this patch.

Technical summary

The vulnerability exists in the certificate upload functionality of SINEMA Remote Connect Server. An authenticated attacker can exploit this by uploading a malformed or crafted certificate that causes a permanent denial-of-service condition. The CVSS 3.1 vector (AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H) indicates network accessibility, low attack complexity, low privilege requirements, no user interaction, and high impact to availability. The permanent nature of the DoS requires administrative intervention to remove the malicious certificate.

Defensive priority

medium

Recommended defensive actions

Apply vendor fix by updating SINEMA Remote Connect Server to V3.2 SP1 or later version
Review and restrict certificate upload permissions to minimize attack surface
Implement network segmentation for industrial control systems per CISA recommended practices
Monitor for unauthorized certificate uploads in system logs
Establish incident response procedures for manual certificate removal if exploitation is suspected

Evidence notes

Vulnerability description and remediation details sourced from CISA CSAF advisory ICSA-24-193-01 and Siemens security advisory SSA-381581. CVSS vector confirms network attack vector with low complexity and high availability impact.

Official resources

2024-07-09