CVE-2024-45777
📋 TL;DR
This vulnerability in grub2 allows attackers to trigger an out-of-bounds write when processing language files, potentially overwriting sensitive heap data. This could lead to bypassing secure boot protections on affected systems. Systems using vulnerable grub2 versions with secure boot enabled are affected.
💻 Affected Systems
- grub2
📦 What is this software?
Openshift by Redhat
⚠️ Risk & Real-World Impact
Worst Case
Complete secure boot bypass allowing persistent malware installation at boot time, potentially leading to full system compromise and persistence across reboots.
Likely Case
Local privilege escalation or secure boot bypass requiring physical access or administrative privileges to modify boot configuration.
If Mitigated
Limited impact if secure boot is disabled or systems are physically secured with restricted boot media access.
🎯 Exploit Status
Exploitation requires ability to modify boot configuration or language files, typically needing local access or administrative privileges.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check specific distribution updates (e.g., Red Hat RHSA-2025:20532)
Vendor Advisory: https://access.redhat.com/errata/RHSA-2025:20532
Restart Required: Yes
Instructions:
1. Update grub2 package via package manager. 2. Regenerate grub configuration. 3. Reboot system to apply changes.
🔧 Temporary Workarounds
Disable secure boot
linuxReduces impact by removing secure boot bypass capability
sudo mokutil --disable-validation
Restrict boot media access
allPrevents unauthorized modification of boot configuration
Configure BIOS/UEFI password protection
Physically secure systems
🧯 If You Can't Patch
- Implement strict physical security controls to prevent unauthorized boot media access
- Disable secure boot if not required for compliance
🔍 How to Verify
Check if Vulnerable:
Check grub2 package version against vendor advisoriesCheck Version:
rpm -q grub2 (RHEL) or dpkg -l grub2 (Debian/Ubuntu)Verify Fix Applied:
Verify grub2 package is updated to patched version and secure boot status📡 Detection & Monitoring
Log Indicators:
- Unexpected grub configuration changes
- Secure boot violation logs
Network Indicators:
- Not network exploitable
SIEM Query:
Search for grub configuration file modifications or secure boot events