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CVE-2024-32006 Siemens CVE debrief

CVE-2024-32006 is a session management vulnerability in Siemens SINEMA Remote Connect Client where user sessions are not expired upon system reboot if the user has not explicitly logged out. This flaw could allow an attacker to bypass Multi-Factor Authentication (MFA) protections. The vulnerability stems from improper session lifecycle management, where authentication state persists across reboots rather than being invalidated. An attacker with prior access to an authenticated session could potentially resume that session after a system restart without re-authenticating through MFA mechanisms. The CVSS 3.1 score of 4.3 (Medium severity) reflects the requirement for prior authenticated access and the limited impact scope. Siemens has addressed this issue in version 3.2 SP2 and later.

Vendor
Siemens
Product
SINEMA Remote Connect Client
CVSS
MEDIUM 4.3
CISA KEV
Not listed in stored evidence
Original CVE published
2024-09-10
Original CVE updated
2024-09-10
Advisory published
2024-09-10
Advisory updated
2024-09-10

Who should care

Organizations using Siemens SINEMA Remote Connect Client for remote industrial network access, particularly those relying on TOTP-based multi-factor authentication. Security teams managing OT/ICS environments, network administrators responsible for remote connectivity solutions, and compliance officers evaluating authentication controls in industrial settings should prioritize this update.

Technical summary

The SINEMA Remote Connect Client fails to invalidate user sessions when the system reboots without an explicit logout action. This session persistence vulnerability could enable MFA bypass scenarios where an attacker with access to a previously authenticated session can resume that session post-reboot without re-authentication. The vulnerability is classified as CWE-613 (Insufficient Session Expiration). The attack requires network access and prior valid credentials, with successful exploitation resulting in authentication bypass. Remediation involves updating to version 3.2 SP2 or later, or implementing certificate-based authentication as an alternative to TOTP MFA.

Defensive priority

medium

Recommended defensive actions

  • Apply vendor fix: Update SINEMA Remote Connect Client to version 3.2 SP2 or later
  • Consider implementing alternative authentication: Use Smartcard or user certificate-based authentication instead of TOTP-based two-factor authentication
  • Implement session monitoring: Review active sessions and enforce explicit logout procedures before system maintenance or reboots
  • Apply defense-in-depth practices: Follow CISA ICS recommended practices for industrial control system security
  • Review authentication architecture: Evaluate session persistence mechanisms in remote access solutions

Evidence notes

Vulnerability disclosed via CISA ICS advisory ICSA-24-256-10 and Siemens security advisory SSA-417159. The issue affects SINEMA Remote Connect Client with improper session expiration on reboot.

Official resources

2024-09-10