Full Report
A specific range of produced SINAMICS S200 devices contains an unlocked bootloader vulnerability that could allow an attacker to download untrusted firmware that could damage or compromise the device. For delivered products listed below Siemens recommends countermeasures.
Analysis Summary
# Vulnerability: Unlocked Bootloader in SINAMICS S200
## CVE Details
- CVE ID: CVE-2024-56336
- CVSS Score: 9.8 (Critical) / 9.5 (Critical) [CVSS v3.1 / CVSS v4.0]
- CWE: CWE-287: Improper Authentication
## Affected Systems
- Products: SINAMICS S200
- Versions: All versions where the serial number begins with **SZVS8, SZVS9, SZVS0, or SZVSN** AND the **FS number is 02**.
- Configurations: Specific hardware/firmware range identified by serial/FS number prefix.
## Vulnerability Description
The affected SINAMICS S200 devices contain an unlocked bootloader. This critical security flaw allows an attacker to bypass standard security controls intended to prevent unauthorized code execution during startup. Successful exploitation enables an attacker to download and install untrusted, potentially malicious, firmware onto the device.
## Exploitation
- Status: Not explicitly stated as exploited in the wild, but high severity suggests high risk.
- Complexity: Low (Based on CVSS vector AV:N/AC:L/PR:N/UI:N)
- Attack Vector: Network (AV:N)
## Impact
- Confidentiality: High (C:H)
- Integrity: High (I:H) - Ability to install malicious firmware implies full integrity compromise.
- Availability: High (A:H) - Untrusted firmware can lead to device damage or denial of service.
## Remediation
### Patches
- No specific patch version is listed in the advisory. Siemens directs users to apply general security recommendations and contact local customer service for further support regarding specific product remediation.
### Workarounds
- Apply **Defense in Depth** measures.
- Follow the **General Security Recommendations** provided by Siemens (primarily network access protection).
- Configure the environment according to Siemens' operational guidelines for Industrial Security.
## Detection
- Detection strategies were not explicitly detailed, focusing instead on preventative mitigation.
- **Mitigation Focus:** Protecting network access to the devices to prevent remote exploitation.
- **General Guidance:** Review operational guidelines for securing the IT environment surrounding the devices.
## References
- Vendor Advisories: SSA-787280
- Relevant links - defanged:
- hxxps://cert-portal.siemens.com/productcert/html/ssa-787280.html
- hxxps://www.siemens.com/cert/operational-guidelines-industrial-security
- hxxps://www.siemens.com/industrialsecurity
- hxxps://www.siemens.com/cert/advisories
- hxxps://www.siemens.com/productcert/terms-of-use