CVE-2022-0685 – CVE-2022-0685 is a memory corruption vulnerabil... (How to Fix)

Q: What is the severity of CVE-2022-0685?

CVE-2022-0685 has a CVSS score of 7.8 (HIGH). CVE-2022-0685 is a memory corruption vulnerability in Vim text editor caused by an out-of-range pointer offset. Attackers can exploit this by tricking users into opening specially crafted files, potentially leading to arbitrary code execution. This affects all users running vulnerable Vim versions.

📋 TL;DR

CVE-2022-0685 is a memory corruption vulnerability in Vim text editor caused by an out-of-range pointer offset. Attackers can exploit this by tricking users into opening specially crafted files, potentially leading to arbitrary code execution. This affects all users running vulnerable Vim versions.

💻 Affected Systems

Products:

Vim text editor

Versions: All versions prior to 8.2.4418

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

Default Config Vulnerable: ⚠️ Yes

Notes: All standard Vim installations are vulnerable. The vulnerability is triggered when processing certain file types.

📦 What is this software?

Macos by Apple

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Vim by Vim

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⚠️ Risk & Real-World Impact

🔴

Worst Case

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

🟠

Likely Case

Application crash (denial of service) or limited memory corruption leading to unstable behavior.

🟢

If Mitigated

No impact if proper patching is applied or if Vim is not used to open untrusted files.

🌐 Internet-Facing: LOW - Vim is typically not directly internet-facing, though could be exploited through web interfaces that invoke Vim.

🏢 Internal Only: MEDIUM - Internal users could be targeted via malicious files in shared directories or email attachments.

🎯 Exploit Status

Public PoC: ⚠️ Yes

Weaponized: LIKELY

Unauthenticated Exploit: ✅ No

Complexity: MEDIUM

Exploitation requires user interaction (opening a malicious file). Proof-of-concept code is available in public disclosures.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: 8.2.4418 and later

Vendor Advisory: https://github.com/vim/vim/commit/5921aeb5741fc6e84c870d68c7c35b93ad0c9f87

Restart Required: No

Instructions:

1. Update Vim using your system's package manager. 2. For Linux: 'sudo apt update && sudo apt upgrade vim' (Debian/Ubuntu) or 'sudo yum update vim' (RHEL/CentOS). 3. For Windows: Download latest installer from vim.org. 4. For macOS: 'brew upgrade vim' or use MacPorts.

🔧 Temporary Workarounds

Restrict file opening

all

Configure Vim to not automatically process certain file types or disable vulnerable features

Add 'set nomodeline' to .vimrc to disable modeline processing
Add 'set secure' to .vimrc for enhanced security

🧯 If You Can't Patch

Restrict Vim usage to trusted users only and implement strict file handling policies
Use alternative text editors for opening untrusted files until patching is possible

🔍 How to Verify

Check if Vulnerable:

Run 'vim --version' and check if version is below 8.2.4418

Check Version:

vim --version | head -1

Verify Fix Applied:

Run 'vim --version' and confirm version is 8.2.4418 or higher

📡 Detection & Monitoring

Log Indicators:

Segmentation fault or crash logs from Vim processes
Unexpected Vim process termination

Network Indicators:

Unusual file transfers to systems running Vim
Attempts to deliver suspicious files to users

SIEM Query:

process_name:vim AND (event_type:crash OR exit_code:139 OR exit_code:11)

📊 Metadata

CVE ID: CVE-2022-0685

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-823

Published: February 20, 2022

Last Updated: November 21, 2024

🔗 References

http://seclists.org/fulldisclosure/2022/Oct/28 Mailing List,Third Party Advisory
http://seclists.org/fulldisclosure/2022/Oct/41 Mailing List,Release Notes,Third Party Advisory
https://github.com/vim/vim/commit/5921aeb5741fc6e84c870d68c7c35b93ad0c9f87 Patch,Third Party Advisory
https://huntr.dev/bounties/27230da3-9b1a-4d5d-8cdf-4b1e62fcd782 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://security.gentoo.org/glsa/202208-32 Third Party Advisory
https://support.apple.com/kb/HT213488 Release Notes,Third Party Advisory
http://seclists.org/fulldisclosure/2022/Oct/28 Mailing List,Third Party Advisory
http://seclists.org/fulldisclosure/2022/Oct/41 Mailing List,Release Notes,Third Party Advisory
https://github.com/vim/vim/commit/5921aeb5741fc6e84c870d68c7c35b93ad0c9f87 Patch,Third Party Advisory
https://huntr.dev/bounties/27230da3-9b1a-4d5d-8cdf-4b1e62fcd782 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://security.gentoo.org/glsa/202208-32 Third Party Advisory
https://support.apple.com/kb/HT213488 Release Notes,Third Party Advisory

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🔗 Related Vulnerabilities

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