#VU53896 Out-of-bounds read in Paint 3D - CVE-2021-31945

Vulnerability identifier: #VU53896

Vulnerability risk: High

CVSSv4.0: 5.7 [CVSS:4.0/AV:L/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-2021-31945

CWE-ID: CWE-125

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Paint 3D
Client/Desktop applications / Office applications

Vendor: Microsoft

Description

The vulnerability allows a remote attacker to compromise the affected system.

The vulnerability exists due to a boundary condition when processing GLB files in Paint 3D. A remote attacker can create a specially crafted GLB file, trick the victim into opening it, trigger out-of-bounds read error and execute arbitrary code on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Paint 3D: All versions

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External links
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31945
https://www.zerodayinitiative.com/advisories/ZDI-21-667/

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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.