CVE-2025-66861
📋 TL;DR
A vulnerability in BinUtils' cp-demangle.c function allows attackers to cause denial of service through specially crafted PE files. This affects systems using BinUtils for binary analysis or development. The low CVSS score indicates limited impact scope.
💻 Affected Systems
- BinUtils
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Application crash leading to service disruption for tools using BinUtils demangling functionality.
Likely Case
Local denial of service when processing malicious PE files with affected BinUtils tools.
If Mitigated
No impact if vulnerable tools aren't processing untrusted PE files.
🎯 Exploit Status
Proof-of-concept available in GitHub repository showing crash. Exploitation requires ability to feed crafted PE file to vulnerable tool.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: BinUtils version after 2.26 (check latest release)
Vendor Advisory: https://sourceware.org/bugzilla/show_bug.cgi?id=XXXXX (specific bug ID not provided in CVE)
Restart Required: No
Instructions:
1. Update BinUtils to latest version from official repository. 2. Recompile any applications linked against BinUtils. 3. Verify fix with test cases.
🔧 Temporary Workarounds
Restrict PE file processing
linuxLimit processing of untrusted PE files by BinUtils tools
chmod -x /usr/bin/c++filt
remove execute permissions from vulnerable tools
Input validation wrapper
linuxCreate script wrapper to validate PE files before processing
#!/bin/bash
if file "$1" | grep -q "PE32"; then
echo "PE file detected - skipping"
exit 1
fi
/usr/bin/c++filt "$@"
🧯 If You Can't Patch
- Isolate BinUtils tools in sandboxed environments
- Implement strict file upload controls for PE files
🔍 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:
Test with provided PoC file from GitHub repository📡 Detection & Monitoring
Log Indicators:
- Segmentation fault logs from c++filt or objdump
- Core dumps from BinUtils processes
Network Indicators:
- N/A - local file processing vulnerability
SIEM Query:
process.name:"c++filt" AND event.action:"segmentation_fault"