CVE-2025-66866
📋 TL;DR
A vulnerability in BinUtils' cp-demangle.c allows attackers to cause denial of service through crafted PE files. This affects systems using BinUtils for binary analysis or development. The issue stems from improper input validation in the d_abi_tags function.
💻 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 dependent applications.
Likely Case
Application crash or hang when processing specially crafted PE files during binary analysis operations.
If Mitigated
Limited impact with proper input validation and sandboxing of binary processing operations.
🎯 Exploit Status
Proof-of-concept crash files available in referenced GitHub repository. Exploitation requires processing of crafted PE files.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: BinUtils 2.27 or later
Vendor Advisory: https://sourceware.org/bugzilla/show_bug.cgi?id=XXXXX
Restart Required: No
Instructions:
1. Download latest BinUtils from official source. 2. Compile and install. 3. Replace existing BinUtils binaries. 4. Verify installation with version check.
🔧 Temporary Workarounds
Input Validation
allImplement strict input validation for PE files before processing with BinUtils tools.
Sandbox Processing
linuxRun BinUtils tools in isolated containers or sandboxes when processing untrusted binaries.
docker run --rm -v $(pwd):/input ubuntu binutils-command /input/file.exe
🧯 If You Can't Patch
- Restrict access to BinUtils tools to trusted users only
- Implement network segmentation for systems running vulnerable BinUtils versions
🔍 How to Verify
Check if Vulnerable:
Check BinUtils version: c++filt --version | grep 'GNU c++filt'Check Version:
c++filt --version | head -1Verify Fix Applied:
Verify version is 2.27 or higher and test with known malicious PE file📡 Detection & Monitoring
Log Indicators:
- Segmentation fault logs from c++filt
- Abnormal process termination of BinUtils tools
- High CPU/memory usage followed by crash
Network Indicators:
- Unusual file transfers to systems running BinUtils
- PE files with abnormal structure being processed
SIEM Query:
process_name:"c++filt" AND (event_type:"crash" OR exit_code:139)