PatchSiren cyber security CVE debrief

CVE-2024-39875 Siemens CVE debrief

CVE-2024-39875 is a medium-severity information disclosure vulnerability in Siemens SINEMA Remote Connect Server. Published on July 9, 2024, the flaw allows authenticated low-privilege users with the 'Manage own remote connections' permission to retrieve details about other users and their group memberships. This represents an authorization boundary violation where users can access information outside their intended scope. The vulnerability has a CVSS 3.1 score of 4.3 (MEDIUM severity) with the vector AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N, indicating network-accessible, low-complexity exploitation requiring low privileges but no user interaction, with limited confidentiality impact. Siemens has released a vendor fix in version V3.2 SP1 or later. Organizations should prioritize updating affected systems and review user permission assignments to ensure least-privilege access controls are properly enforced.

Vendor: Siemens
Product: SINEMA Remote Connect Server
CVSS: MEDIUM 4.3
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 those with multi-user environments where privilege separation is critical for operational security. Security teams responsible for OT/ICS infrastructure and identity access management administrators should prioritize this update.

Technical summary

The affected application fails to properly enforce authorization boundaries for the 'Manage own remote connections' permission. Authenticated users with this low-privilege permission can retrieve details about other users and their group memberships, violating the principle of least privilege and potentially enabling further targeted attacks through user enumeration.

Defensive priority

medium

Recommended defensive actions

Update SINEMA Remote Connect Server to version V3.2 SP1 or later to address the information disclosure vulnerability
Review and audit user accounts with the 'Manage own remote connections' permission to ensure least-privilege access controls
Monitor access logs for unauthorized enumeration of user details or group membership queries
Apply network segmentation controls to limit access to SINEMA Remote Connect Server management interfaces
Follow CISA ICS recommended practices for defense-in-depth strategies for industrial control systems

Evidence notes

Vulnerability description and remediation guidance sourced from CISA CSAF advisory ICSA-24-193-01 and Siemens security advisory SSA-381581. CVSS vector and score confirmed from source metadata. Vendor fix version V3.2 SP1 explicitly stated in remediations section.

Official resources

2024-07-09