Vulnerability identifier: #VU63065

Vulnerability risk: High

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-3796

CWE-ID: CWE-416

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Vim
Client/Desktop applications / Office applications

Vendor: Vim.org

Description

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

The vulnerability exists due to a use-after-free error. A remote attacker can trick the victim to open a specially crafted file, trigger a use-after-free error and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Vim: 8.2.0 - 8.2.3427

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External links
http://github.com/vim/vim/commit/35a9a00afcb20897d462a766793ff45534810dc3
http://huntr.dev/bounties/ab60b7f3-6fb1-4ac2-a4fa-4d592e08008d
http://www.openwall.com/lists/oss-security/2021/10/01/1
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TE62UMYBZE4AE53K6OBBWK32XQ7544QM/
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/S42L4Z4DTW4LHLQ4FJ33VEOXRCBE7WN4/
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/7K4JJBIH3OQSZRVTWKCJCDLGMFGQ5DOH/
http://lists.debian.org/debian-lts-announce/2022/01/msg00003.html

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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.