CVE-2025-66863
📋 TL;DR
A vulnerability in BinUtils' cp-demangle.c function allows attackers to cause denial of service through crafted PE files. This affects systems using BinUtils for binary analysis or development. The issue is triggered when processing malicious Portable Executable files.
💻 Affected Systems
- BinUtils
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system crash or service disruption when processing malicious PE files, potentially affecting binary analysis tools, build systems, or security scanners.
Likely Case
Application crash or hang when processing specially crafted PE files, disrupting binary analysis workflows or automated scanning processes.
If Mitigated
Limited impact with proper input validation and sandboxing of binary analysis operations.
🎯 Exploit Status
Public proof-of-concept exists showing crash reproduction. Exploitation requires feeding crafted PE files to vulnerable BinUtils tools.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check BinUtils repository for fixes beyond 2.26
Vendor Advisory: https://sourceware.org/bugzilla/show_bug.cgi?id=[check BinUtils bug tracker]
Restart Required: No
Instructions:
1. Update BinUtils to patched version from official repository. 2. Recompile any applications using BinUtils libraries. 3. Replace vulnerable binaries with updated versions.
🔧 Temporary Workarounds
Input validation for PE files
allImplement strict validation of PE file headers before processing with BinUtils tools
# Add pre-processing script to validate PE magic numbers
# Use file command to verify file type before processing
Sandbox binary analysis
linuxRun BinUtils tools in isolated containers or sandboxes with resource limits
docker run --memory=512m --cpus=1 -v /input:/input image_with_binutils
firejail --net=none --private binutils_command
🧯 If You Can't Patch
- Restrict processing of untrusted PE files with BinUtils tools
- Implement monitoring for crashes in BinUtils processes and alert on abnormal termination
🔍 How to Verify
Check if Vulnerable:
Check BinUtils version: objdump --version | grep 'version' and verify if it's 2.26Check Version:
objdump --version | head -1Verify Fix Applied:
Test with known malicious PE file from PoC and ensure no crash occurs📡 Detection & Monitoring
Log Indicators:
- Segmentation fault logs from BinUtils processes
- Abnormal termination of cxxfilt, objdump, or related tools
- Core dumps from demangling operations
Network Indicators:
- Unusual file transfers of PE files to analysis systems
- Multiple failed analysis attempts on same file
SIEM Query:
process_name IN ('cxxfilt', 'objdump', 'readelf') AND exit_code = 139