#VU63901 NULL pointer dereference in LibreCAD - CVE-2021-45343

Vulnerability identifier: #VU63901

Vulnerability risk: Medium

CVSSv4.0: 4.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-45343

CWE-ID: CWE-476

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
LibreCAD
Universal components / Libraries / Libraries used by multiple products

Vendor: LibreCad

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error in the HATCH handling of libdxfrw. A remote attacker can trick the victim into opening a specially crafted DXF document and perform a denial of service (DoS) attack.

Mitigation
Install update from vendor's website.

Vulnerable software versions

LibreCAD: 1.0.0 rc1 - 2.2.0 rc3

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External links
https://github.com/LibreCAD/LibreCAD/issues/1468
https://github.com/LibreCAD/LibreCAD/commit/29e85c5ff151018c6252afa104366e02c0da36e7

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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.