Full Report
Several products used in Sinteso EN and Cerberus PRO EN Fire Protection Systems contain buffer overflow vulnerabilities in the network communication stack. Successful exploitation of the vulnerabilities could allow an unauthenticated attacker, who gained access to the fire protection system network, to execute arbitrary code on the affected products (CVE-2024-22039) or create a denial of service condition (CVE-2024-22040, CVE-2024-22041). Product-specific impact of the individual vulnerabilities is documented in the chapter “Vulnerability Description”. Siemens has released new versions for several affected products and recommends to update to the latest versions. Siemens is preparing further fix versions and recommends countermeasures for products where fixes are not, or not yet available.
Analysis Summary
# Vulnerability: Buffer Overflows in Sinteso EN and Cerberus PRO EN Network Communication Stack
## CVE Details
- CVE ID: CVE-2024-22039, CVE-2024-22040, CVE-2024-22041
- CVSS Score: Critical (10.0 CVSS v3.1 Base Score) for CVE-2024-22039 (Implied highest severity for RCE); Specific scores noted for exploitation requiring on-path attack (5.9 CVSS v3.1).
- CWE: Buffer Overflow (Inferred)
## Affected Systems
- Products:
- Cerberus PRO EN Engineering Tool
- Cerberus PRO EN Fire Panel FC72x (IP6, IP7, IP8)
- Cerberus PRO EN X200/X300 Cloud Distribution (IP7, IP8)
- Sinteso FS20 EN Engineering Tool
- Sinteso FS20 EN Fire Panel FC20 (MP6, MP7)
- Sinteso Mobile
- Sinteso FS20 EN X200/X300 Cloud Distribution (MP7)
- Versions: Specific versions are defined as **less than** a certain patch level (e.g., Engineering Tool < IP8 for CVE-2024-22039). Refer to the full Siemens advisory for precise version mapping.
## Vulnerability Description
Multiple buffer overflow vulnerabilities exist within the network communication stack of affected Siemens fire protection system products.
1. **CVE-2024-22039:** Successful exploitation could allow an unauthenticated attacker on the network to **execute arbitrary code**.
2. **CVE-2024-22040 & CVE-2024-22041:** Successful exploitation could lead to a **Denial of Service (DoS)** condition.
Note on context: For Engineering/Distribution tools (e.g., Cerberus PRO EN Engineering Tool), exploitation requires an on-path attacker intercepting network communication, limiting the impact to the tool itself, not the underlying OS (CVSS 5.9). For core panel/system components, the implication of a 10.0 score suggests a higher potential impact, likely leading to remote code execution/crash without such constraints, though attack vectors are generally described as requiring network access.
## Exploitation
- Status: Not explicitly stated as exploited in the wild, but a PoC/attack scenario is described for some components.
- Complexity: **Low** in general (Unauthenticated network access for RCE/DoS), but **Medium/High** (requiring on-path interception) for some Engineering/Distribution tools.
- Attack Vector: **Network** (Requires access to the fire protection system network).
## Impact
- Confidentiality: Unknown/Not primary impact for DoS, but potential impact if arbitrary code execution (CVE-2024-22039) is achieved.
- Integrity: High (Arbitrary Code Execution via CVE-2024-22039).
- Availability: High (Denial of Service via CVE-2024-22040, CVE-2024-22041).
## Remediation
### Patches
Siemens has released new versions for several affected products. Users must update to the specific latest versions detailed in the advisory:
* **CVE-2024-22039 Fixes:**
* Cerberus PRO EN Engineering Tool: Update to **IP8 or later**.
* Cerberus PRO EN Fire Panel FC72x IP6: Update to **IP6 SR3 or later**.
* Cerberus PRO EN Fire Panel FC72x IP7: Update to **IP7 SR5 or later**.
* Cerberus PRO EN X200 Cloud Distribution IP7: Update to **V3.0.6602 or later**.
* Cerberus PRO EN X200 Cloud Distribution IP8: Update to **V4.0.5016 or later**.
* Cerberus PRO EN X300 Cloud Distribution IP7: Update to **V3.2.6601 or later**.
* *Fixes were also added for Sinteso FS20 EN Panel/Cloud versions MP7, MP6, IP7 (V1.1 update).*
* **CVE-2024-22040/22041 Fixes:**
* Cerberus PRO EN Fire Panel FC72x IP8: Update to **IP8 SR4 or later**.
* Cerberus PRO EN X200 Cloud Distribution IP8: Update to **V4.3.5618 or later**.
### Workarounds
For products where fixes are not yet available (e.g., some FC72x IP6/IP7 versions regarding CVE-2024-22040/22041), Siemens recommends implementing **countermeasures**. (Specific countermeasures are not detailed in this summary but must be sought in the full advisory.)
## Detection
General detection focuses on identifying anomalous network traffic targeting the fire protection system components, specifically around the network communication stack protocols used by these products.
- Indicators of Compromise: Anomalous network connection attempts or unexpected crashes/reboots on affected network-facing components when targeting unpatched communication interfaces.
- Detection Methods and Tools: Network monitoring tools should look for traffic patterns associated with known attack vectors or network scanning against the proprietary protocols utilized by Sinteso EN/Cerberus PRO EN systems.
## References
- Vendor Advisories:
- Siemens Security Advisory SSA-225840 ([https://cert-portal.siemens.com/productcert/html/ssa-225840.html](https://cert-portal.siemens.com/productcert/html/ssa-225840.html))