CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:P/I:P/A:P
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
68.8%
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--------- End Update A Part 1 of 3 ---------
This updated advisory is a follow-up to the original advisory titled ICSA-21-047-01 Open Design Alliance Drawings SDK that was published February 16, 2021, to the ICS webpage on us-cert.gov.
Successful exploitation of these vulnerabilities may allow code execution in the context of the current process or cause a denial-of-service condition.
The following versions of Drawings SDK, a software development kit for DWG and DGN, are affected:
--------- Begin Update A Part 2 of 3 ---------
--------- End Update A Part 2 of 3 ---------
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.
CVE-2021-25178 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).
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.
CVE-2021-25177 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).
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.
CVE-2021-25176 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).
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.
CVE-2021-25175 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).
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.
CVE-2021-25174 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).
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.
CVE-2021-25173 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).
--------- Begin Update A Part 3 of 3 ---------
An out-of-bounds write issue exists in the file-reading procedure Drawings SDK before 2021.6 on all supported by ODA platforms in static configuration. This could allow an attacker to execute code or cause a denial-of-service condition.
CVE-2021-31784 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).
--------- End Update A Part 3 of 3 ---------
Michael DePlante (@izobashi) and rgod, working with Trend Microβs 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 Allianceβs Security Advisories.
For more information on products dependent on the affected Drawings SDK see the following vendor security advisories:
CISA recommends users take the following measures to protect themselves from 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-12-146-01BβTargeted 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.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-25173
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-25174
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-25175
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-25176
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-25177
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-25178
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-31784
cert-portal.siemens.com/productcert/pdf/ssa-663999.pdf
cisasurvey.gov1.qualtrics.com/jfe/form/SV_9n4TtB8uttUPaM6?product=https://www.cisa.gov/news-events/ics-advisories/icsa-21-047-01
cwe.mitre.org/data/definitions/121.html
cwe.mitre.org/data/definitions/704.html
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cwe.mitre.org/data/definitions/789.html
cwe.mitre.org/data/definitions/789.html
cwe.mitre.org/data/definitions/822.html
cwe.mitre.org/data/definitions/843.html
docs.opendesign.com/td/frames.html?frmname=topic&frmfile=MovingToNewVersion.html
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us-cert.cisa.gov/ics
us-cert.cisa.gov/ics/recommended-practices
us-cert.cisa.gov/ics/tips/ICS-TIP-12-146-01B
us-cert.cisa.gov/ncas/tips/ST04-014
us-cert.cisa.gov/sites/default/files/publications/emailscams_0905.pdf
us-cert.cisa.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf
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CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:P/I:P/A:P
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
68.8%