Full Report
Siemens has released version V13.1.0.1 for JT2Go and Teamcenter Visualization to fix multiple vulnerabilities that could be triggered when the products read files in different file formats (BMP, TIFF, CGM, TGA, PCT, HPG, PLT, RAS, PAR, ASM, DXF, DWG). If a user is tricked to opening of a malicious file with the affected products, this could lead to application crash, or potentially arbitrary code execution or data extraction on the target host system. Siemens recommends to update to the latest versions and to limit opening of untrusted files from unknown sources in the affected products. Notes: Previous versions of this advisory incorrectly listed the following vulnerabilities as being fixed in V13.1.0.1: CVE-2020-26991, CVE-2020-26998, CVE-2020-26999, CVE-2020-27001 and CVE-2020-27002. Those were fixed in V13.1.0.2 and are therefore addressed in advisory SSA-695540 [0] The vulnerability CVE-2020-28383 was incorrectly listed in SSA-622830 [1] as being fixed in V13.1.0.0. This was fixed in V13.1.0.1 and therefore added here The Open Design Alliance [2] recently disclosed an additional vulnerability (CVE-2021-31784) which is also covered in this advisory [0] https://cert-portal.siemens.com/productcert/pdf/ssa-622830.pdf [1] https://cert-portal.siemens.com/productcert/pdf/ssa-695540.pdf [2] https://www.opendesign.com/security-advisories
Analysis Summary
# Vulnerability: Multiple Memory Corruption Flaws in Siemens JT2Go and Teamcenter Visualization
## CVE Details
* **CVE ID:** CVE-2020-28383, CVE-2021-31784 (Note: CVEs 2020-26991, 2020-26998, 2020-26999, 2020-27001, and 2020-27002 are excluded from this specific version fix and moved to SSA-695540).
* **CVSS Score:** Not explicitly provided in the text, but typically rated **High** for arbitrary code execution.
* **CWE:** Likely CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) or CWE-787 (Out-of-bounds Write) based on the description of malicious file parsing.
## Affected Systems
* **Products:**
* Siemens JT2Go
* Siemens Teamcenter Visualization
* **Versions:** All versions prior to V13.1.0.1.
* **Configurations:** Systems processing specific CAD and image file formats including BMP, TIFF, CGM, TGA, PCT, HPG, PLT, RAS, PAR, ASM, DXF, and DWG.
## Vulnerability Description
The vulnerabilities exist in the way JT2Go and Teamcenter Visualization parse various image and CAD file formats. Due to improper validation of user-supplied data, the application may experience memory corruption when reading a specially crafted file. This flaw is triggered during the file decompression or rendering process.
## Exploitation
* **Status:** Not reported as exploited in the wild (based on context), but disclosed by Open Design Alliance.
* **Complexity:** Medium (Requires a user to open a malicious file).
* **Attack Vector:** Local (Social Engineering/User Interaction required).
## Impact
* **Confidentiality:** High (Potential for data extraction from the host system).
* **Integrity:** High (Potential for arbitrary code execution).
* **Availability:** High (Can lead to application crashes/Denial of Service).
## Remediation
### Patches
* **Update to V13.1.0.1 or later:** This version specifically addresses CVE-2020-28383 and CVE-2021-31784.
* *Note:* Users should ideally move to **V13.1.0.2** to address additional vulnerabilities (CVE-2020-26991, etc.) referenced in the advisory notes.
### Workarounds
* **Restrict File Sources:** Do not open untrusted or unsolicited files from unknown sources, especially the formats listed (DXF, DWG, BMP, etc.).
* **Principle of Least Privilege:** Run the software with reduced privileges to minimize the impact of potential code execution.
## Detection
* **Indicators of compromise:** Unusual application crashes when opening CAD/image files; unexpected outbound network traffic following a crash; creation of suspicious temporary files.
* **Detection methods:** Use Endpoint Detection and Response (EDR) tools to monitor for suspicious child processes spawned by `JT2Go.exe` or Teamcenter Visualization binaries.
## References
* Siemens Security Advisory SSA-622830: hxxps[://]cert-portal[.]siemens[.]com/productcert/pdf/ssa-622830[.]pdf
* Siemens Security Advisory SSA-695540: hxxps[://]cert-portal[.]siemens[.]com/productcert/pdf/ssa-695540[.]pdf
* Open Design Alliance Security Advisories: hxxps[://]www[.]opendesign[.]com/security-advisories