#VU60795 Use-after-free in Vim - CVE-2021-4069

Vulnerability identifier: #VU60795

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-2021-4069

CWE-ID: CWE-416

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Vim
Client/Desktop applications / Software for system administration

Vendor: Vim.org

Description

The vulnerability allows a remote attacker to compromise vulnerable 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 system.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Vim: 8.2.0 - 8.2.3740

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External links
https://huntr.dev/bounties/0efd6d23-2259-4081-9ff1-3ade26907d74
https://github.com/vim/vim/commit/e031fe90cf2e375ce861ff5e5e281e4ad229ebb9
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WYB2LLNUFJUKJJ5HYCZ6MV3Z6YX3U5BN/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FNXY7T5OORA7UJIMGSJBGHFMU6UZWS6P/
https://www.openwall.com/lists/oss-security/2022/01/15/1

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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.