CVE-2025-21533
📋 TL;DR
This vulnerability in Oracle VM VirtualBox allows a low-privileged attacker with local access to the host system to access sensitive data from VirtualBox. It affects VirtualBox versions prior to 7.0.24 and 7.1.6. The attacker must already have login credentials to the infrastructure where VirtualBox runs.
💻 Affected Systems
- Oracle VM VirtualBox
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of all VirtualBox-accessible data including virtual machine configurations, snapshots, and potentially sensitive guest OS data.
Likely Case
Unauthorized access to VirtualBox configuration files, virtual disk metadata, and network settings that could facilitate further attacks.
If Mitigated
Limited impact if proper access controls and segmentation are in place, restricting low-privileged users from VirtualBox infrastructure.
🎯 Exploit Status
The CVSS vector indicates low attack complexity and no user interaction required, but attacker must have local access with low privileges.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 7.0.24 or 7.1.6
Vendor Advisory: https://www.oracle.com/security-alerts/cpujan2025.html
Restart Required: Yes
Instructions:
1. Download VirtualBox 7.0.24 or 7.1.6 from Oracle website. 2. Uninstall current VirtualBox version. 3. Install the patched version. 4. Restart the host system.
🔧 Temporary Workarounds
Restrict VirtualBox Access
linuxLimit which users can access VirtualBox installation directories and configuration files
chmod 750 /usr/lib/virtualbox
chmod 750 /etc/virtualbox
chown root:root /usr/lib/virtualbox -R
Remove Low-Privileged Access
allEnsure only administrators have access to systems running VirtualBox
🧯 If You Can't Patch
- Implement strict access controls to prevent low-privileged users from accessing VirtualBox host systems
- Monitor VirtualBox-related file access and process execution for suspicious activity
🔍 How to Verify
Check if Vulnerable:
Check VirtualBox version: On Windows use 'VBoxManage --version', on Linux use 'VBoxManage --version' or check installed package versionCheck Version:
VBoxManage --versionVerify Fix Applied:
Verify version is 7.0.24 or higher for 7.0.x branch, or 7.1.6 or higher for 7.1.x branch📡 Detection & Monitoring
Log Indicators:
- Unauthorized access attempts to VirtualBox configuration files
- Suspicious process execution from low-privileged accounts accessing VirtualBox directories
Network Indicators:
- N/A - This is a local vulnerability
SIEM Query:
EventID=4663 AND ObjectName LIKE '%VirtualBox%' AND SubjectUserName NOT IN (admin_users_list)