Siemens JT2Go and Teamcenter Visualization

1. EXECUTIVE SUMMARY

• CVSS v3 7.8
• ATTENTION: Low attack complexity
• Vendor: Siemens
• Equipment: JT2Go and Teamcenter Visualization
• Vulnerabilities: Untrusted Pointer Dereference, Out-of-bounds Read, Stack-based Buffer Overflow

2. RISK EVALUATION

Successful exploitation of these vulnerabilities could lead to arbitrary code execution or information leakage.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following products are affected:

• JT2Go: All versions prior to v13.1.0.2
• Teamcenter Visualization: All versions prior to v13.1.0.2

3.2 VULNERABILITY OVERVIEW

3.2.1    OUT-OF-BOUNDS READ CWE-125

Affected applications lack proper validation of user-supplied data when parsing PAR files. This could result in a memory access past the end of an allocated buffer. An attacker could leverage this vulnerability to leak information.

CVE-2020-26998 has been assigned to this vulnerability. A CVSS v3 base score of 7.8 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H).

3.2.2    OUT-OF-BOUNDS READ CWE-125

Affected applications lack proper validation of user-supplied data when parsing of PAR files. This could result in a memory access past the end of an allocated buffer. An attacker could leverage this vulnerability to leak information.

CVE-2020-26999 has been assigned to this vulnerability. A CVSS v3 base score of 7.8 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H).

3.2.3    STACK-BASED BUFFER OVERFLOW CWE-121

Affected applications lack proper validation of user-supplied data when parsing of PAR files. This could result in a stack-based buffer overflow. An attacker could leverage this vulnerability to execute code in the context of the current process.

CVE-2020-27001 has been assigned to this vulnerability. A CVSS v3 base score of 7.8 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H).

3.2.4    OUT-OF-BOUNDS READ CWE-125

Affected applications lack proper validation of user-supplied data when parsing PAR files. This could result in a memory access past the end of an allocated buffer. An attacker could leverage this vulnerability to access data in the context of the current process.

CVE-2020-27002 has been assigned to this vulnerability. A CVSS v3 base score of 7.8 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)

3.2.5    UNTRUSTED POINTER DEREFERENCE CWE-822

Affected applications lack proper validation of user-supplied data when parsing ASM files. This could lead to pointer dereferences of a value obtained from an untrusted source. An attacker could leverage this vulnerability to execute code in the context of the current process.

CVE-2020-26991 has been assigned to this vulnerability. A CVSS v3 base score of 7.8 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H).

3.3 BACKGROUND

• CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
• COUNTRIES/AREAS DEPLOYED: Worldwide
• COMPANY HEADQUARTERS LOCATION: Germany

3.4 RESEARCHER

Michael DePlante (@izobashi), Francis Provencher {PRL}, and rgod, working with Trend Micro’s Zero Day Initiative reported four of these vulnerabilities to CISA. Carsten Eiram from Risk Based Security reported the fifth (CVE-2020-26991) to Siemens.

4. MITIGATIONS

Siemens recommends the following:

• JT2Go: Update to v13.1.0.2 or later
• Teamcenter Visualization: Update to v13.1.0.2 or later (Login required)
• Avoid opening untrusted files from unknown sources in JT2Go and Teamcenter Visualization

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 Siemens’ operational guidelines for industrial security and following the recommendations in the product manuals.

Additional information on industrial security by Siemens can be found at: https://www.siemens.com/industrialsecurity

For more information see Siemens Security Advisory SSA-695540

CISA recommends users take the following measures to protect themselves from social engineering attacks:

• Do not click web links or open unsolicited attachments in email messages.
• Refer to Recognizing and Avoiding Email Scams for more information on avoiding email scams.
• Refer to Avoiding Social Engineering and Phishing Attacks for more information on social engineering attacks.

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 us-cert.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 us-cert.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 these vulnerabilities. These vulnerabilities are not exploitable remotely.

• Siemens