#VU72523 Out-of-bounds write in Drawings SDK - CVE-2021-43391

Vulnerability identifier: #VU72523

Vulnerability risk: High

CVSSv4.0: 6.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2021-43391

CWE-ID: CWE-787

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Drawings SDK
Other software / Other software solutions

Vendor: Open Design Alliance

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a boundary error when parsing a DXF file. A remote attacker can create a specially crafted file, trick the victim into opening it using the affected software, trigger an out-of-bounds write and execute arbitrary code on the target system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Drawings SDK: before 2022.11

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External links
https://www.opendesign.com/security-advisories
https://www.zerodayinitiative.com/advisories/ZDI-21-1352/
https://www.zerodayinitiative.com/advisories/ZDI-21-1361/
https://cert-portal.siemens.com/productcert/pdf/ssa-491245.pdf
https://www.zerodayinitiative.com/advisories/ZDI-23-211/

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.