Full Report
SINEC NMS and SINEMA Server V14 contain multiple vulnerabilities that could allow an attacker to execute arbitrary code on the system, arbitrary commands on the local database or achieve privilege escalation. Siemens has released several updates for SINEC NMS and recommends to update to the latest version. Siemens recommends specific countermeasures for products where updates are not, or not yet available.
Analysis Summary
# Vulnerability: Multiple Critical Flaws in Siemens SINEC NMS and SINEMA Server V14
## CVE Details
*Note: The advisory describes multiple vulnerabilities, but the summary focuses on those detailed.*
| CVE ID | CVSS Score | Severity | CWE |
| :--- | :--- | :--- | :--- |
| CVE-2022-24281 | 7.2 | High | CWE-89 (SQL Injection) |
| CVE-2022-24282 | 7.2 | High | CWE-502 (Deserialization of Untrusted Data) |
| CVE-2022-25311 | 7.3 | High | CWE-269 (Improper Privilege Management) |
## Affected Systems
* **Products:** SINEC NMS, SINEMA Server V14
* **Versions:**
* **SINEC NMS:** All versions **less than V2.0** that are also V1.0.3 or greater (V1.0.3 < V2.0).
* **SINEMA Server V14:** All versions.
* **Configurations:** Specific conditions relate to authenticated access for different flaws.
## Vulnerability Description
The advisory covers three distinct vulnerabilities:
1. **CVE-2022-24281 (SQL Injection):** A privileged, authenticated attacker can execute arbitrary commands in the local database by sending specifically crafted requests to the webserver.
2. **CVE-2022-24282 (Insecure Deserialization):** A privileged attacker can exploit this by sending a maliciously crafted serialized Java object (JSON format). This could lead to the execution of arbitrary code on the device with root privileges.
3. **CVE-2022-25311 (Privilege Escalation):** The affected software fails to properly check privileges between users during the same web browser session, allowing an authenticated low-privileged user to escalate their privileges.
## Exploitation
* **Status:** All documented vulnerabilities show evidence of exploitation (**E:P** in the CVSS vectors), indicating Proof-of-Concept (PoC) availability or active exploitation observed by the vendor.
* **Complexity:** Low (AC:L) for all three described vulnerabilities.
* **Attack Vector:**
* CVE-2022-24281 & CVE-2022-24282: Network (AV:N)
* CVE-2022-25311: Local (AV:L)
## Impact
| Vulnerability | Confidentiality | Integrity | Availability |
| :--- | :--- | :--- | :--- |
| CVE-2022-24281 | High (C:H) | High (I:H) | High (A:H) |
| CVE-2022-24282 | High (C:H) | High (I:H) | High (A:H) |
| CVE-2022-25311 | High (C:H) | High (I:H) | High (A:H) |
## Remediation
### Patches
* **SINEC NMS:** Update to **V2.0 or later version**. (Fixes for CVE-2022-24281 and remaining vulnerabilities were included in V2.0; CVE-2022-24281 was partially addressed in V1.0.3).
* **SINEMA Server V14:** Currently, **no fix is planned** by Siemens. Remediation relies solely on workarounds and mitigation strategies.
### Workarounds
1. **Network Restriction:** Restrict access to the affected systems, especially **port 443/tcp**, to trusted IP addresses only.
2. **SSO Logout (for CVE-2022-25311):** If Single Sign-On (SSO) was established, users authenticated in both Control and Operation environments should **logout explicitly in both locations** to prevent privilege escalation derived from session state.
## Detection
* **Indicators of Compromise:** Suspicious database activity (SQL errors, unusual queries) or unauthorized command execution traces, particularly attempts to upload serialized Java objects (if monitoring deserialization entry points is possible).
* **Detection Methods and Tools:** Monitoring network traffic aimed at port 443/tcp for injection patterns or malformed JSON/serialized objects originating from untrusted sources. Implement strict application-layer monitoring if possible for attempts bypassing authorization checks.
## References
* Vendor Advisory: SSA-250085
* Siemens Support Link for SINEC NMS Update: hxxps://support.industry.siemens.com/cs/ww/en/view/109824030/
* Siemens Industrial Security Guidelines: hxxps://www.siemens.com/cert/operational-guidelines-industrial-security
* General Siemens Industrial Security Information: hxxps://www.siemens.com/industrialsecurity