#VU63892 Out-of-bounds write in libdxfrw - CVE-2021-21898

Vulnerability identifier: #VU63892

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-2021-21898

CWE-ID: CWE-787

Exploitation vector: Network

Exploit availability: No

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

Vendor: LibreCad

Description

The vulnerability allows a remote attacker to execute arbitrary code on the system.

The vulnerability exists due to a boundary error in the dwgCompressor::decompress18() function. A remote attacker can trick the victim into opening a specially crafted .dwg file, trigger out-of-bounds write and execute arbitrary code on the target system.

Mitigation
Install update from vendor's website.

Vulnerable software versions

libdxfrw: 0.5.10 - 1.0.1

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External links
https://talosintelligence.com/vulnerability_reports/TALOS-2021-1349

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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.