CVE-2025-15277
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code by tricking users into opening malicious SGI image files in FontForge. Attackers can achieve remote code execution in the context of the current user process. Users who process untrusted SGI files with FontForge are affected.
💻 Affected Systems
- FontForge
📦 What is this software?
Fontforge by Fontforge
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise through remote code execution with user privileges, potentially leading to data theft, ransomware deployment, or lateral movement.
Likely Case
Local privilege escalation or malware installation when users open malicious SGI files from untrusted sources.
If Mitigated
Limited impact if proper file validation and user awareness prevent malicious file execution.
🎯 Exploit Status
Requires user interaction to open malicious file. Exploit development requires understanding of heap overflow techniques.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check FontForge security advisories for specific patched version
Vendor Advisory: https://github.com/fontforge/fontforge/security/advisories
Restart Required: No
Instructions:
1. Check current FontForge version
2. Update to latest patched version from official repository
3. Verify SGI file parsing functionality works correctly
🔧 Temporary Workarounds
Disable SGI file processing
allRemove or restrict SGI file format support in FontForge configuration
# Configuration modification depends on FontForge build options
File type restrictions
allUse system policies to block SGI files from being opened with FontForge
# Platform-specific file association modifications
🧯 If You Can't Patch
- Implement application whitelisting to prevent unauthorized FontForge execution
- Educate users to never open SGI files from untrusted sources
🔍 How to Verify
Check if Vulnerable:
Check FontForge version against security advisory. Test with known safe SGI files to verify parsing functionality.Check Version:
fontforge --versionVerify Fix Applied:
Verify FontForge version is updated and test SGI file parsing with edge cases.📡 Detection & Monitoring
Log Indicators:
- FontForge crash logs with heap corruption errors
- Unexpected process spawning from FontForge
Network Indicators:
- Downloads of SGI files from suspicious sources
SIEM Query:
Process:fontforge AND (EventID:1000 OR ExceptionCode:c0000005)