CVE-2025-9390
📋 TL;DR
A buffer overflow vulnerability in vim's xxd component allows local attackers to execute arbitrary code or cause denial of service. The flaw exists in the main function of src/xxd/xxd.c and affects vim installations up to version 9.1.1615. Attackers with local access can exploit this to potentially gain elevated privileges.
💻 Affected Systems
- vim
📦 What is this software?
Vim by Vim
⚠️ Risk & Real-World Impact
Worst Case
Local privilege escalation leading to full system compromise, arbitrary code execution as the user running xxd, or complete system crash.
Likely Case
Denial of service (xxd crash) or limited code execution within the context of the user running xxd.
If Mitigated
Minimal impact if proper access controls limit local user privileges and xxd usage is restricted.
🎯 Exploit Status
Exploit requires local access and user interaction with xxd. The exploit has been released publicly according to the CVE description.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 9.1.1616
Vendor Advisory: https://github.com/vim/vim/releases/tag/v9.1.1616
Restart Required: No
Instructions:
1. Update vim using your system's package manager (apt-get upgrade vim, yum update vim, etc.)
2. Verify installation of vim version 9.1.1616 or later
3. No service restart required as xxd is a command-line utility
🔧 Temporary Workarounds
Remove or restrict xxd access
allRemove execute permissions from xxd binary or restrict access via permissions/ACLs
sudo chmod -x /usr/bin/xxd
sudo chmod 000 /usr/bin/xxd
Disable xxd via package management
linuxRemove xxd package if installed separately
sudo apt-get remove xxd
sudo yum remove xxd
🧯 If You Can't Patch
- Implement strict access controls to limit which users can execute xxd
- Monitor for unusual xxd execution patterns or crashes
🔍 How to Verify
Check if Vulnerable:
Check vim version: vim --version | head -1. If version is 9.1.1615 or earlier, system is vulnerable.Check Version:
vim --version | head -1Verify Fix Applied:
Verify vim version is 9.1.1616 or later: vim --version | head -1📡 Detection & Monitoring
Log Indicators:
- xxd process crashes
- segmentation faults in xxd
- unusual xxd execution patterns
Network Indicators:
- None - local-only vulnerability
SIEM Query:
Process:Name='xxd' AND (EventID=1000 OR EventID=1001) OR Process:Name='xxd' AND CommandLine CONTAINS suspicious_pattern🔗 References
- https://drive.google.com/file/d/1JLnqrdcGsjUhbYzIEweXIGZyETjHlKtX/view?usp=sharing
- https://github.com/vim/vim/commit/eeef7c77436a78cd27047b0f5fa6925d56de3cb0
- https://github.com/vim/vim/issues/17944
- https://github.com/vim/vim/pull/17947
- https://github.com/vim/vim/releases/tag/v9.1.1616
- https://vuldb.com/?ctiid.321223
- https://vuldb.com/?id.321223
- https://vuldb.com/?submit.630903
- https://github.com/vim/vim/issues/17944
- https://vuldb.com/?submit.630903
