Full Report
SINUMERIK ONE, SINUMERIK 840D sl and SINUMERIK 828D are affected by a privilege escalation vulnerability that could allow an authenticated local attacker to escalate their privileges in the underlying system. Siemens has released new versions for several affected products and recommends to update to the latest versions. Siemens recommends countermeasures for products where fixes are not, or not yet available.
Analysis Summary
# Vulnerability: Privilege Escalation in SINUMERIK CNC Systems
## CVE Details
- CVE ID: CVE-2024-41171
- CVSS Score: 8.8 (CVSS v3.1) / 9.3 (CVSS v4.0) (High)
- CWE: CWE-732: Incorrect Permission Assignment for Critical Resource
## Affected Systems
- Products: SINUMERIK ONE, SINUMERIK 840D sl, SINUMERIK 828D
- Versions:
- SINUMERIK 828D V4: All versions
- SINUMERIK 828D V5: All versions prior to V5.24
- SINUMERIK 840D sl V4: All versions
- SINUMERIK ONE: All versions prior to V6.24
- Configurations: Requires an authenticated local attacker.
## Vulnerability Description
The vulnerability resides in the affected devices' failure to properly enforce access restrictions to system scripts that are executed regularly with elevated privileges. An authenticated local attacker can leverage this flaw to escalate their privileges within the underlying operating system.
## Exploitation
- Status: Information suggests the vulnerability has an Exploitability subscore of 'E:P' (Proof-of-Concept) in the CVSS v3.1 vector, indicating PoC material may exist or be easily created.
- Complexity: Low (AC:L)
- Attack Vector: Local (AV:L)
## Impact
Based on the CVSS v3.1 vector (C:H/I:H/A:H):
- Confidentiality: High
- Integrity: High
- Availability: High
## Remediation
### Patches
- **SINUMERIK 828D V5:** Update to version V5.24 or later.
- **SINUMERIK ONE:** Update to version V6.24 or later.
- **SINUMERIK 828D V4 & SINUMERIK 840D sl V4:** Currently, no fix is planned.
> *Note: Updated software versions should be obtained from Siemens customer support or a local partner.*
### Workarounds
For products where fixes are not yet available (SINUMERIK 828D V4 and 840D sl V4), Siemens strongly recommends implementing general security measures:
1. Protect network access to the devices using appropriate mechanisms.
2. Configure the environment according to Siemens' operational guidelines for Industrial Security.
3. Follow the recommendations provided in the product manuals.
## Detection
- Detection methods specific to this local privilege escalation are not detailed in the summary provided.
- General indicators involve monitoring for unusual processes executing with elevated privileges or unauthorized modification attempts on critical system scripts by authenticated local users.
## References
- Siemens Advisory SSA-342438: hxxps://cert-portal.siemens.com/productcert/html/ssa-342438.html
- Siemens Industrial Security Information: hxxps://www.siemens.com/industrialsecurity
- Siemens Industrial Security Operational Guidelines: hxxps://www.siemens.com/cert/operational-guidelines-industrial-security