Full Report
Simcenter Nastran is affected by a stack overflow vulnerability that could be triggered when an application binary reads arbitrary string as a file argument. If a user is tricked to run one of the impacted application binary with a malicious string, an attacker could leverage the vulnerability to perform remote code execution in the context of the current process. Siemens has released a new version for Simcenter Nastran and recommends to update to the latest version.
Analysis Summary
# Vulnerability: Stack Overflow in Simcenter Nastran
## CVE Details
- **CVE ID:** CVE-2026-59086
- **CVSS Score:**
- CVSS v3.1: **7.8 (High)**
- CVSS v4.0: **7.3 (High)**
- **CWE:** CWE-121 (Stack-based Buffer Overflow)
## Affected Systems
- **Products:** Simcenter Nastran (Finite Element Method solver)
- **Versions:** All versions prior to V2606
- **Configurations:** Systems where the application binary is executed with user-supplied command-line arguments.
## Vulnerability Description
A stack-based buffer overflow exists in Simcenter Nastran binaries. The flaw is triggered when the application parses an arbitrarily long or specially crafted string passed as a file argument. Because the application does not properly validate the length of the input string before copying it to the stack, an attacker can overwrite the return address or other control data on the stack.
## Exploitation
- **Status:** Not currently reported as exploited in the wild; no public PoC listed in advisory.
- **Complexity:** Low (v3.1) / High (v4.0 - reflects the requirement for social engineering).
- **Attack Vector:** Local (The attacker must provide a malicious string as a command-line argument).
- **User Interaction:** Required (A user must be tricked into running the binary with the malicious string).
## Impact
- **Confidentiality:** High (Potential for unauthorized data access via RCE)
- **Integrity:** High (Potential for unauthorized modification of data)
- **Availability:** High (Potential for application crash or system instability)
- **Overall Result:** Remote Code Execution (RCE) in the context of the current process.
## Remediation
### Patches
- **Simcenter Nastran V2606:** Siemens recommends updating to V2606 or a later version to resolve this vulnerability.
### Workarounds
- No specific software workarounds are provided.
- General mitigation involves practicing the principle of least privilege, ensuring users do not run binaries with untrusted or unverified command-line arguments.
## Detection
- **Indicators of Compromise:** Unexpected application crashes (segmentation faults) when starting Simcenter Nastran; unusual process behavior following the execution of the solver via CLI.
- **Detection Methods:** Monitor command-line execution logs for unusually long or obfuscated string arguments passed to Simcenter Nastran binaries.
## References
- **Vendor Advisory:** hxxps://cert-portal.siemens.com/productcert/html/ssa-069220.html
- **Support Portal:** hxxps://support.sw.siemens.com/product/289054037/
- **Industrial Security Guidelines:** hxxps://www.siemens.com/cert/operational-guidelines-industrial-security