CVE-2021-26825
📋 TL;DR
CVE-2021-26825 is an integer overflow vulnerability in Godot Engine that allows attackers to trigger a stack buffer overflow by loading specially crafted TGA image files. This can lead to arbitrary code execution or application crashes. Users of Godot Engine up to version 3.2 are affected.
💻 Affected Systems
- Godot Engine
📦 What is this software?
Godot Engine by Godotengine
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution with attacker gaining full control of the system running the vulnerable Godot application.
Likely Case
Application crash leading to denial of service, with potential for code execution in specific configurations.
If Mitigated
Application crash without code execution if memory protections like ASLR are effective.
🎯 Exploit Status
The vulnerability is in a core image loading function and exploitation details are publicly available in the patch references.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Godot 3.2.4 and later, 3.3 and later
Vendor Advisory: https://github.com/godotengine/godot/pull/45702
Restart Required: Yes
Instructions:
1. Update Godot Engine to version 3.2.4 or later. 2. Rebuild any applications using Godot with the updated engine. 3. Redeploy updated applications to production environments.
🔧 Temporary Workarounds
Disable TGA image loading
allModify Godot applications to disable loading of TGA image files by removing TGA support or implementing file type validation.
Implement input validation
allAdd validation to reject TGA files with suspicious dimensions before passing to the vulnerable function.
🧯 If You Can't Patch
- Implement network segmentation to isolate vulnerable systems from untrusted networks.
- Deploy application allowlisting to prevent execution of unauthorized Godot applications.
🔍 How to Verify
Check if Vulnerable:
Check Godot version: if version is 3.2.3 or earlier, the system is vulnerable. Also check if applications load TGA files.Check Version:
godot --version (command line) or check About dialog in editorVerify Fix Applied:
Verify Godot version is 3.2.4 or later, or 3.3 or later. Test loading TGA files to ensure no crashes occur.📡 Detection & Monitoring
Log Indicators:
- Application crashes when loading image files
- Memory access violation errors related to image loading
Network Indicators:
- Unusual network requests for TGA files
- Traffic patterns suggesting file upload exploitation
SIEM Query:
source="application_logs" AND ("segmentation fault" OR "access violation") AND process="godot"