All information products included in https://us-cert.cisa.gov/ics are provided "as is" for informational purposes only. The Department of Homeland Security (DHS) does not provide any warranties of any kind regarding any information contained within. DHS does not endorse any commercial product or service, referenced in this product or otherwise. Further dissemination of this product is governed by the Traffic Light Protocol (TLP) marking in the header. For more information about TLP, see https://us-cert.cisa.gov/tlp/.
1. EXECUTIVE SUMMARY
- CVSS v3 7.8
- ATTENTION: Low skill level to exploit
- Vendor: Open Design Alliance
- Equipment: Drawings SDK
- Vulnerabilities: Stack-based Buffer Overflow, Type Confusion, Untrusted Pointer Dereference, Incorrect Type Conversion or Cast, Memory Allocation with Excessive Size Value
2. RISK EVALUATION
Successful exploitation of these vulnerabilities may allow code execution in the context of the current process or cause a denial-of-service condition.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of Drawings SDK, a software development kit for DWG and DGN, are affected:
- Drawings SDK: All versions prior to 2021.12 (Version 2021.11 is only affected by CVE-2021-25174 and CVE-2021-25173)
3.2 VULNERABILITY OVERVIEW
The affected product is vulnerable to a stack-based buffer overflow while processing malformed DXF and DWG files. This could allow an attacker to execute code or cause a denial-of-service condition.
A type confusion issue exists when rendering malformed DXF and DWG files. This could allow an attacker to execute code or cause a denial-of-service condition.
A NULL pointer dereference exists when rendering malformed DXF and DWG files. This could allow an attacker to execute code or cause a denial-of-service condition.
A type conversion issue exists when rendering malformed DXF and DWG files. This could allow an attacker to execute code or cause a denial-of-service condition.
A memory corruption issue exists when reading malformed DGN files. This could allow an attacker to execute code or cause a denial-of-service condition.
A memory allocation with excessive size issue exists when reading malformed DGN files. This could allow an attacker to execute code or cause a denial-of-service condition.
- CRITICAL INFRASTRUCTURE SECTORS: Multiple
- COUNTRIES/AREAS DEPLOYED: Worldwide
- COMPANY HEADQUARTERS LOCATION: United States
Michael DePlante (@izobashi) and rgod, working with Trend Micro’s Zero Day Initiative, reported these vulnerabilities to CISA. Siemens ProductCERT assisted coordination with Open Design Alliance.
Open Design Alliance recommends updating to v2021.12 or later. Instructions for ODA members can be found here (Login Required).
For more information refer to Open Design Alliance’s Security Advisories.
For more information on products dependent on the affected Drawings SDK see the following vendor security advisories:
- Siemens: SSA-663999
CISA recommends users take the following measures to protect themselves from social engineering attacks:
- Only use project files from trusted sources.
- Ensure the least-privilege user principle is followed.
- 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.
For any questions related to this report, please contact the CISA at:
Toll Free: 1-888-282-0870
CISA continuously strives to improve its products and services. You can help by choosing one of the links below to provide feedback about this product.
Please share your thoughts.
We recently updated our anonymous product survey; we'd welcome your feedback.