CVE-2020-24292
📋 TL;DR
This is a buffer overflow vulnerability in FreeImage's ICO file parser that allows remote attackers to execute arbitrary code by tricking a user or system into opening a malicious ICO file. It affects FreeImage 3.19.0 and potentially earlier versions. Any application using FreeImage to process ICO files is vulnerable.
💻 Affected Systems
- FreeImage
📦 What is this software?
Freeimage by Freeimage Project
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution with the privileges of the application using FreeImage, potentially leading to full system compromise.
Likely Case
Application crash (denial of service) or limited code execution depending on exploit sophistication and mitigations like ASLR/DEP.
If Mitigated
Application crash with no code execution if modern exploit mitigations are fully effective.
🎯 Exploit Status
Buffer overflow vulnerabilities in image parsers are commonly exploited. The references suggest active discussion and patching, indicating exploitability is recognized.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: FreeImage 3.19.0 with patch or later version (check FreeImage project for exact fixed version)
Vendor Advisory: https://sourceforge.net/p/freeimage/discussion/36111/thread/afb98701eb/
Restart Required: Yes
Instructions:
1. Check if your system uses FreeImage via package manager or embedded library. 2. Update FreeImage to the patched version. 3. For Linux distributions like Fedora, apply security updates via 'sudo dnf update freeimage'. 4. Rebuild or restart any applications that link to FreeImage.
🔧 Temporary Workarounds
Disable ICO file processing
allIf possible, configure applications to disable loading of ICO files via FreeImage.
Application-specific; no universal command
Use file type restrictions
allImplement strict file type validation to reject ICO files from untrusted sources.
Application-specific; implement in web forms or processing pipelines
🧯 If You Can't Patch
- Isolate applications using FreeImage in sandboxed environments or containers with minimal privileges.
- Implement network segmentation to limit access to systems processing ICO files, and monitor for anomalous file uploads or crashes.
🔍 How to Verify
Check if Vulnerable:
Check FreeImage version: on Linux, run 'rpm -q freeimage' or 'dpkg -l | grep freeimage'; version 3.19.0 or earlier indicates potential vulnerability.Check Version:
On Linux: 'rpm -q freeimage' or 'dpkg -l | grep freeimage'. On Windows, check application dependencies or FreeImage DLL version.Verify Fix Applied:
After update, confirm FreeImage version is patched (e.g., 3.19.0 with patch or later). Test with a known safe ICO file to ensure functionality.📡 Detection & Monitoring
Log Indicators:
- Application crashes or unexpected terminations when processing ICO files
- Error logs mentioning FreeImage or buffer overflow in PluginICO.cpp
Network Indicators:
- Unusual uploads of ICO files to web applications
- Network traffic spikes correlating with file processing
SIEM Query:
Example: 'event.category:process AND process.name:your_app AND event.outcome:failure' combined with file.extension:ico🔗 References
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HFRQ76ZDPSWT7OH6FJDLSFWBXVBE6JDN/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M6GKMK74POW3RU7F4HLUJE7XEFLQDO35/
- https://sourceforge.net/p/freeimage/discussion/36111/thread/afb98701eb/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HFRQ76ZDPSWT7OH6FJDLSFWBXVBE6JDN/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M6GKMK74POW3RU7F4HLUJE7XEFLQDO35/
- https://sourceforge.net/p/freeimage/discussion/36111/thread/afb98701eb/
