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1. EXECUTIVE SUMMARY
- CVSS v3 6.8
- ATTENTION: Exploitable remotely/low attack complexity
- Vendor: Siemens
- Equipment: Teamcenter Active Workspace
- Vulnerability: Path Traversal
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow an attacker to achieve remove code execution.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of Teamcenter Active Workspace, a collaboration tool, are affected:
- Teamcenter Active Workspace v4.3: All versions prior to v4.3.11
- Teamcenter Active Workspace v5.0: All versions prior to v5.0.10
- Teamcenter Active Workspace v5.1: All versions prior to v5.1.6
- Teamcenter Active Workspace v5.2: All versions prior to v5.2.3
3.2 VULNERABILITY OVERVIEW
The application contains an unsafe unzipping pattern that could lead to a zip path traversal attack. This could allow an attacker to execute a remote shell with admin rights.
- CRITICAL INFRASTRUCTURE SECTORS: Multiple Sectors
- COUNTRIES/AREAS DEPLOYED: Worldwide
- COMPANY HEADQUARTERS LOCATION: Germany
Siemens reported this vulnerability to CISA.
Siemens recommends updating to the latest version of the software:
- Teamcenter Active Workspace v4.3: Update to v4.3.11 or later (login required)
- Teamcenter Active Workspace v5.0: Update to v5.0.10 or later (login required)
- Teamcenter Active Workspace v5.1: Update to v5.1.6 or later (login required)
- Teamcenter Active Workspace v5.2: Update to v5.2.3 or later (login required)
Siemens has identified the following specific workarounds and mitigations users can apply to reduce the risk:
- Harden the application host to prevent local access by untrusted personnel
As a general security measure, Siemens strongly recommends protecting network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends configuring the environment according to the Siemens operational guidelines for industrial security and following the recommendations in the product manuals.
For additional information, please refer to Siemens Security Advisory SSA-133772
CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should:
- Minimize network exposure for all control system devices and/or systems, and ensure they are not accessible from the Internet.
- Locate control system networks and remote devices behind firewalls and isolate them from the business network.
- When remote access is required, use secure methods, such as Virtual Private Networks (VPNs), recognizing VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize VPN is only as secure as its connected devices.
CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
CISA also provides a section for control systems security recommended practices on the ICS webpage on cisa.gov. Several recommended practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.
Additional mitigation guidance and recommended practices are publicly available on the ICS webpage on cisa.gov in the Technical Information Paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies.
Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to CISA for tracking and correlation against other incidents.
No known public exploits specifically target this vulnerability.
For any questions related to this report, please contact the CISA at:
Toll Free: 1-888-282-0870
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