Full Report
Several Industrial Communication Devices based on SINEC OS before V3.2 contain multiple vulnerabilities that could allow an attacker to circumvent authorization checks and perform actions that exceed the permissions of the “guest” role. Siemens has released new versions for the affected products and recommends to update to the latest versions.
Analysis Summary
# Vulnerability: Multiple Authorization and Race Condition Flaws in Siemens SINEC OS
## CVE Details
- **CVE-2025-40567**
- CVSS Score: 6.5 (Medium) / CVSS v4.0: 7.1 (High)
- CWE: CWE-863 (Incorrect Authorization)
- **CVE-2025-40568**
- CVSS Score: 4.3 (Medium) / CVSS v4.0: 5.3 (Medium)
- CWE: CWE-863 (Incorrect Authorization)
- **CVE-2025-40569**
- CVSS Score: 4.8 (Medium) / CVSS v4.0: 5.9 (Medium)
- CWE: CWE-362 (Race Condition)
## Affected Systems
- **Products:**
- RUGGEDCOM RST2428P (6GK6242-6PA00)
- SCALANCE XCM-300 family (XCM324, XCM328, XCM332)
- SCALANCE XRM-300 family (XRM334)
- SCALANCE XCH-300 family (XCH328)
- SCALANCE XRH-300 family (XRH334)
- **Versions:** All versions prior to V3.2.
- **Configurations:** Systems running SINEC OS with the web interface enabled and user accounts configured (specifically the "guest" role).
## Vulnerability Description
The affected devices contain three distinct flaws within the SINEC OS web interface:
1. **Configuration Rollback (CVE-2025-40567):** An incorrect authorization check allows a user with "guest" privileges to trigger a rollback of configuration changes made by higher-privileged administrators.
2. **Session Termination (CVE-2025-40568):** A flaw in the internal session management allows a "guest" user to terminate the active sessions of other legitimate users, potentially causing a Denial of Service (DoS) for administrators.
3. **Configuration Injection (CVE-2025-40569):** A race condition in the "Load Configuration from Local PC" feature. If an attacker with low privileges triggers this during an administrator's configuration upload, the device may load the attacker-controlled configuration instead of the legitimate one.
## Exploitation
- **Status:** Not reported as exploited in the wild; No public PoC mentioned in the advisory.
- **Complexity:**
- Low (CVE-2025-40567, CVE-2025-40568)
- High/Medium (CVE-2025-40569 - requires winning a race condition and user interaction).
- **Attack Vector:** Network (Authenticated).
## Impact
- **Confidentiality:** None identified.
- **Integrity:** High (Ability to revert configurations or inject malicious configurations).
- **Availability:** Low (Ability to terminate legitimate administrative sessions).
## Remediation
### Patches
Siemens recommends updating all affected products to **SINEC OS V3.2** or later.
- Update link: [https://support.industry.siemens.com/cs/ww/en/view/109988839/](https://support.industry.siemens.com/cs/ww/en/view/109988839/)
### Workarounds
The advisory does not list specific workarounds. General best practices for Industrial Control Systems (ICS) include:
- Restricting web interface access to trusted networks/VLANs only.
- Following the "Least Privilege" principle for user account assignments.
- Implementing defense-in-depth as per Siemens operational guidelines.
## Detection
- **Indicators of Compromise:**
- Unexpected configuration rollbacks.
- Frequent, unexplained session terminations for administrative users.
- Unauthorized configuration changes during a legitimate maintenance window.
- **Detection methods:** Review system audit logs for actions performed by "guest" accounts that involve session management or configuration utilities.
## References
- **Vendor Advisory:** [https://cert-portal.siemens.com/productcert/pdf/ssa-693776.pdf](https://cert-portal.siemens.com/productcert/pdf/ssa-693776.pdf)
- **Siemens ProductCERT:** [https://www.siemens.com/cert/advisories](https://www.siemens.com/cert/advisories)