#VU30494 Use-after-free in Vim - CVE-2019-20079

Vulnerability identifier: #VU30494

Vulnerability risk: High

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2019-20079

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 non-authenticated attacker to execute arbitrary code.

The autocmd feature in window.c in Vim before 8.1.2136 accesses freed memory.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Vim: 8.1.0000 - 8.1.2135

---

External links
https://github.com/vim/vim/commit/ec66c41d84e574baf8009dbc0bd088d2bc5b2421
https://github.com/vim/vim/compare/v8.1.2135...v8.1.2136
https://packetstormsecurity.com/files/154898
https://usn.ubuntu.com/4309-1/

---

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.