CVE-2024-25985
📋 TL;DR
CVE-2024-25985 is a use-after-free vulnerability in the bigo_unlocked_ioctl function of bigo.c that allows local privilege escalation without requiring user interaction. This affects Android devices with vulnerable kernel drivers, particularly Google Pixel devices. Attackers can exploit this to gain root privileges on compromised devices.
💻 Affected Systems
- Google Pixel devices
- Android devices with vulnerable bigo kernel driver
📦 What is this software?
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Full device compromise with root access, allowing installation of persistent malware, data theft, and complete control over the device.
Likely Case
Local privilege escalation leading to unauthorized access to sensitive data and system resources on compromised devices.
If Mitigated
Limited impact if SELinux/AppArmor policies restrict ioctl operations or if the vulnerable driver is not loaded.
🎯 Exploit Status
Exploitation requires local access and knowledge of kernel memory layout. No public exploit code is currently available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: March 2024 Android security patch or later
Vendor Advisory: https://source.android.com/security/bulletin/pixel/2024-03-01
Restart Required: Yes
Instructions:
1. Apply March 2024 Android security patch from Google. 2. For Pixel devices: Settings > System > System update > Check for update. 3. For other Android devices: Check with manufacturer for security patch availability. 4. Reboot device after update.
🔧 Temporary Workarounds
Disable bigo kernel module
linuxPrevent loading of the vulnerable bigo kernel driver
echo 'blacklist bigo' >> /etc/modprobe.d/blacklist.conf
rmmod bigo
Restrict ioctl permissions
linuxUse SELinux/AppArmor to restrict ioctl operations on bigo device
# SELinux: Add policy to deny bigo ioctl
# AppArmor: Add deny rule for /dev/bigo ioctl
🧯 If You Can't Patch
- Implement strict application sandboxing and privilege separation
- Monitor for suspicious privilege escalation attempts and kernel module loading
🔍 How to Verify
Check if Vulnerable:
Check Android security patch level: Settings > About phone > Android version > Build number. If before March 2024, device is vulnerable.Check Version:
adb shell getprop ro.build.version.security_patchVerify Fix Applied:
Verify security patch level shows March 2024 or later. Check if bigo kernel module is still loaded: 'lsmod | grep bigo' should return empty.📡 Detection & Monitoring
Log Indicators:
- Kernel logs showing use-after-free errors
- SELinux/AppArmor denials for bigo ioctl operations
- Unexpected privilege escalation events
Network Indicators:
- None - this is a local vulnerability
SIEM Query:
source="kernel" AND ("use-after-free" OR "UAF") AND "bigo"