CVE-2019-12735 : What You Need to Know

A vulnerability in the "getchar.c" file in versions of Vim prior to 8.1.1365 and Neovim prior to 0.3.6 allows remote attackers to execute arbitrary operating system commands by utilizing the ":source!" command in a modeline. This can be exploited through the "execute" command in Vim or by using "assert_fails" or "nvim_input" in Neovim.

Understanding CVE-2019-12735

This CVE identifies a security flaw in Vim and Neovim versions before specific updates.

What is CVE-2019-12735?

The vulnerability in Vim and Neovim versions allows remote attackers to execute arbitrary OS commands via specific commands in a modeline.

The Impact of CVE-2019-12735

The vulnerability can be exploited by malicious actors to execute unauthorized operating system commands, potentially leading to system compromise.

Technical Details of CVE-2019-12735

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The vulnerability in Vim and Neovim versions allows remote attackers to execute arbitrary OS commands via the :source! command in a modeline.

Affected Systems and Versions

Vim versions before 8.1.1365
Neovim versions before 0.3.6

Exploitation Mechanism

The vulnerability can be exploited by utilizing the :source! command in a modeline in Vim or by using assert_fails or nvim_input in Neovim.

Mitigation and Prevention

Protect your systems from CVE-2019-12735 with the following measures:

Immediate Steps to Take

Update Vim to version 8.1.1365 or later.
Update Neovim to version 0.3.6 or later.
Avoid executing untrusted modelines in Vim or Neovim.

Long-Term Security Practices

Regularly update Vim and Neovim to the latest versions.
Educate users on safe practices when handling modelines in text editors.

Patching and Updates

Ensure timely installation of security patches and updates for Vim and Neovim to mitigate the vulnerability.