CVE-2022-0408 – CVE-2022-0408 is a stack-based buffer overflow ... (How to Fix)

Q: What is the severity of CVE-2022-0408?

CVE-2022-0408 has a CVSS score of 7.8 (HIGH). CVE-2022-0408 is a stack-based buffer overflow vulnerability in Vim text editor that allows attackers to execute arbitrary code by tricking users into opening specially crafted files. This affects all users running Vim versions prior to 8.2. The vulnerability requires user interaction to open a malicious file.

📋 TL;DR

CVE-2022-0408 is a stack-based buffer overflow vulnerability in Vim text editor that allows attackers to execute arbitrary code by tricking users into opening specially crafted files. This affects all users running Vim versions prior to 8.2. The vulnerability requires user interaction to open a malicious file.

💻 Affected Systems

Products:

Vim

Versions: All versions prior to 8.2

Operating Systems: Linux, Unix-like systems, Windows, macOS

Default Config Vulnerable: ⚠️ Yes

Notes: All standard Vim installations are vulnerable. The vulnerability is in core Vim functionality.

📦 What is this software?

⚠️ Risk & Real-World Impact

🔴

Worst Case

Remote code execution with the privileges of the Vim user, potentially leading to full system compromise if the user has elevated privileges.

🟠

Likely Case

Local privilege escalation or arbitrary code execution when users open malicious files from untrusted sources.

🟢

If Mitigated

Limited impact if users only open trusted files and Vim runs with restricted privileges.

🌐 Internet-Facing: LOW - Vim is not typically exposed to internet-facing services, though malicious files could be delivered via web downloads.

🏢 Internal Only: MEDIUM - Internal users could be targeted via phishing or shared malicious files, leading to lateral movement.

🎯 Exploit Status

Public PoC: ⚠️ Yes

Weaponized: LIKELY

Unauthenticated Exploit: ✅ No

Complexity: MEDIUM

Exploitation requires user interaction to open a malicious file. Proof-of-concept code is publicly available in the GitHub commit reference.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Vim 8.2 and later

Vendor Advisory: https://github.com/vim/vim/commit/06f15416bb8d5636200a10776f1752c4d6e49f31

Restart Required: No

Instructions:

1. Update Vim using your system package manager: 'sudo apt update && sudo apt upgrade vim' (Debian/Ubuntu) or 'sudo yum update vim' (RHEL/CentOS). 2. For source installations: Download Vim 8.2+ from vim.org and compile. 3. Verify version with 'vim --version'.

🔧 Temporary Workarounds

Restrict file sources

all

Only open Vim files from trusted sources and avoid opening unknown files.

Use alternative editors

all

Temporarily use patched alternatives like Neovim or nano until Vim is updated.

🧯 If You Can't Patch

Run Vim with reduced privileges using sandboxing tools like firejail or bubblewrap.
Implement strict file integrity monitoring and user behavior analytics to detect malicious file access patterns.

🔍 How to Verify

Check if Vulnerable:

Run 'vim --version' and check if version is less than 8.2. Vulnerable if output shows version like 8.1 or earlier.

Check Version:

vim --version | head -1

Verify Fix Applied:

Run 'vim --version' and confirm version is 8.2 or higher. Check patch level in output.

📡 Detection & Monitoring

Log Indicators:

Unusual Vim process spawning child processes
Vim crashes with segmentation faults
Vim accessing unexpected files

Network Indicators:

Downloads of suspicious files followed by Vim execution

SIEM Query:

process_name:vim AND (process_child_count > 0 OR exit_code:139)

📊 Metadata

CVE ID: CVE-2022-0408

CVSS v3 Score: 7.8 (HIGH)

CVSS Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CWE: CWE-121

Published: January 30, 2022

Last Updated: November 21, 2024

🔗 References

https://github.com/vim/vim/commit/06f15416bb8d5636200a10776f1752c4d6e49f31 Patch,Third Party Advisory
https://huntr.dev/bounties/5e635bad-5cf6-46cd-aeac-34ef224e179d Exploit,Patch,Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/03/msg00018.html Mailing List,Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/11/msg00009.html Mailing List,Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7ZLEHVP4LNAGER4ZDGUDS5V5YVQD6INF/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UFXFAILMLUIK4MBUEZO4HNBNKYZRJ5AP/
https://security.gentoo.org/glsa/202208-32 Third Party Advisory
https://github.com/vim/vim/commit/06f15416bb8d5636200a10776f1752c4d6e49f31 Patch,Third Party Advisory
https://huntr.dev/bounties/5e635bad-5cf6-46cd-aeac-34ef224e179d Exploit,Patch,Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/03/msg00018.html Mailing List,Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/11/msg00009.html Mailing List,Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7ZLEHVP4LNAGER4ZDGUDS5V5YVQD6INF/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UFXFAILMLUIK4MBUEZO4HNBNKYZRJ5AP/
https://security.gentoo.org/glsa/202208-32 Third Party Advisory

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