CVE-2021-43280 – CVE-2021-43280 is a stack-based buffer overflow... (How to Fix)

Q: What is the severity of CVE-2021-43280?

CVE-2021-43280 has a CVSS score of 7.8 (HIGH). CVE-2021-43280 is a stack-based buffer overflow vulnerability in Open Design Alliance Drawings SDK that allows remote code execution when processing malicious DWF files. Attackers can exploit this to execute arbitrary code with the privileges of the application using the SDK. Organizations using affected versions of ODA Drawings SDK in CAD applications or document processing systems are vulnerable.

📋 TL;DR

CVE-2021-43280 is a stack-based buffer overflow vulnerability in Open Design Alliance Drawings SDK that allows remote code execution when processing malicious DWF files. Attackers can exploit this to execute arbitrary code with the privileges of the application using the SDK. Organizations using affected versions of ODA Drawings SDK in CAD applications or document processing systems are vulnerable.

💻 Affected Systems

Products:

Open Design Alliance Drawings SDK
Applications using ODA Drawings SDK for DWF file processing

Versions: All versions before 2022.8

Operating Systems: Windows, Linux, macOS (any OS where SDK is deployed)

Default Config Vulnerable: ⚠️ Yes

Notes: Any application that uses the vulnerable SDK functions for reading DWF files is affected, regardless of the application's own security.

📦 What is this software?

Drawings Software Development Kit by Opendesign

View all CVEs affecting Drawings Software Development Kit →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Complete system compromise through remote code execution, leading to data theft, ransomware deployment, or lateral movement within networks.

🟠

Likely Case

Application crash (denial of service) or limited code execution depending on exploit sophistication and memory protections.

🟢

If Mitigated

Application crash without code execution if modern exploit mitigations (ASLR, DEP) are effective.

🌐 Internet-Facing: MEDIUM - Requires user interaction to open malicious DWF files, but web applications processing uploaded DWF files could be directly exploitable.

🏢 Internal Only: MEDIUM - Internal users could be tricked into opening malicious files via phishing or shared drives.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: LIKELY

Unauthenticated Exploit: ⚠️ Yes

Complexity: MEDIUM

Multiple ZDI advisories suggest weaponization is likely. Exploitation requires crafting malicious DWF files but no authentication is needed to trigger the vulnerability.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: 2022.8 and later

Vendor Advisory: https://www.opendesign.com/security-advisories

Restart Required: Yes

Instructions:

1. Identify applications using ODA Drawings SDK. 2. Update to SDK version 2022.8 or later. 3. Rebuild/redeploy applications with patched SDK. 4. Restart affected services/applications.

🔧 Temporary Workarounds

Block DWF file processing

all

Prevent processing of DWF files at network or application level

Application sandboxing

all

Run applications using ODA SDK in restricted environments

🧯 If You Can't Patch

Implement strict file upload controls to block DWF files
Use application allowlisting to prevent unauthorized applications from running

🔍 How to Verify

Check if Vulnerable:

Check application documentation or contact vendors to confirm ODA Drawings SDK usage and version

Check Version:

Application-specific; typically requires checking vendor documentation or SDK header files

Verify Fix Applied:

Verify SDK version is 2022.8 or later and applications have been rebuilt with updated SDK

📡 Detection & Monitoring

Log Indicators:

Application crashes when processing DWF files
Unusual process spawning from CAD/document applications

Network Indicators:

Unexpected DWF file transfers
Exploit kit traffic patterns

SIEM Query:

Process creation from CAD applications OR Application crash events with DWF file references

📊 Metadata

CVE ID: CVE-2021-43280

CVSS v3 Score: 7.8 (HIGH)

CVSS Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CWE: CWE-787

Published: November 14, 2021

Last Updated: November 21, 2024

🔗 References

https://www.opendesign.com/security-advisories Vendor Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-1340/ Third Party Advisory,VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-21-1341/ Third Party Advisory,VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-21-1342/ Third Party Advisory,VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-21-1343/ Third Party Advisory,VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-21-1345/ Third Party Advisory,VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-21-1355/ Third Party Advisory,VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-21-1356/ Third Party Advisory,VDB Entry
https://www.opendesign.com/security-advisories Vendor Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-1340/ Third Party Advisory,VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-21-1341/ Third Party Advisory,VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-21-1342/ Third Party Advisory,VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-21-1343/ Third Party Advisory,VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-21-1345/ Third Party Advisory,VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-21-1355/ Third Party Advisory,VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-21-1356/ Third Party Advisory,VDB Entry

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🔗 Related Vulnerabilities

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