CVE-2025-55157
📋 TL;DR
This CVE describes a use-after-free vulnerability in Vim's tuple reference management when processing nested tuples in Vim script. An attacker could exploit this to cause memory corruption, potentially leading to arbitrary code execution or application crashes. Users running Vim versions 9.1.1231 through 9.1.1399 are affected.
💻 Affected Systems
- Vim
📦 What is this software?
Vim by Vim
⚠️ Risk & Real-World Impact
Worst Case
Arbitrary code execution with the privileges of the Vim process, potentially leading to full system compromise if Vim is run with elevated privileges.
Likely Case
Application crash (segmentation fault) or denial of service, with potential for limited code execution in specific memory corruption scenarios.
If Mitigated
No impact if the vulnerable Vim script is not executed or if the system has proper memory protection mechanisms.
🎯 Exploit Status
Exploitation requires the victim to execute a malicious Vim script, which could be delivered via social engineering or compromised files. The technical complexity of crafting a reliable exploit is moderate due to memory corruption nuances.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 9.1.1400
Vendor Advisory: https://github.com/vim/vim/security/advisories/GHSA-3r4f-mm4w-wgg6
Restart Required: No
Instructions:
1. Check current Vim version with 'vim --version'. 2. If vulnerable, update using your package manager (e.g., 'sudo apt update && sudo apt upgrade vim' on Debian/Ubuntu, 'sudo yum update vim' on RHEL/CentOS). 3. Alternatively, compile from source using the patched version from the official repository.
🔧 Temporary Workarounds
Restrict Vim script execution
allPrevent execution of untrusted Vim scripts by disabling script loading or using sandboxed environments.
vim -Z (restricted mode)
set secure in .vimrc
Use alternative text editors
allTemporarily switch to non-vulnerable text editors like nano, emacs, or vscode until patched.
🧯 If You Can't Patch
- Implement strict access controls to limit who can run Vim and execute scripts.
- Use application whitelisting to prevent execution of unauthorized Vim scripts.
🔍 How to Verify
Check if Vulnerable:
Run 'vim --version' and check if the version is between 9.1.1231 and 9.1.1399 inclusive.Check Version:
vim --version | head -1Verify Fix Applied:
After updating, run 'vim --version' and confirm the version is 9.1.1400 or higher.📡 Detection & Monitoring
Log Indicators:
- Segmentation fault crashes in system logs (e.g., /var/log/syslog)
- Unexpected Vim process terminations
Network Indicators:
- None - this is a local vulnerability
SIEM Query:
EventID=1000 OR EventID=1001 (Windows Application Crash) OR 'segmentation fault' AND 'vim' (Linux logs)