CVE-2025-66865
📋 TL;DR
A stack-based buffer overflow vulnerability exists in the cp-demangle.c file of BinUtils 2.26, specifically in the d_print_comp_inner function. Attackers can exploit this by crafting a malicious PE file to cause a denial of service (crash) or potentially execute arbitrary code. This affects systems using BinUtils tools like cxxfilt, objdump, or readelf to process PE files.
💻 Affected Systems
- BinUtils
- GNU BinUtils
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to full system compromise if the vulnerable binary processes attacker-controlled PE files.
Likely Case
Denial of service through application crash when processing malicious PE files.
If Mitigated
Limited impact if BinUtils tools are not used to process untrusted PE files.
🎯 Exploit Status
Proof-of-concept crash demonstration is publicly available. Weaponization for RCE would require additional exploitation techniques.
🛠️ 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. Check current BinUtils version: `objdump --version`. 2. Update using package manager: `sudo apt update && sudo apt upgrade binutils` (Debian/Ubuntu) or `sudo yum update binutils` (RHEL/CentOS). 3. Verify update: `objdump --version | head -1`.
🔧 Temporary Workarounds
Restrict PE file processing
allLimit use of BinUtils tools on untrusted PE files.
Use alternative tools
allReplace vulnerable BinUtils tools with updated versions or alternatives for PE file analysis.
🧯 If You Can't Patch
- Implement strict input validation for PE files processed by BinUtils tools.
- Isolate systems using BinUtils 2.26 and restrict network access.
🔍 How to Verify
Check if Vulnerable:
Run `objdump --version | head -1` and check if output contains '2.26'. If yes, system is vulnerable.Check Version:
objdump --version | head -1Verify Fix Applied:
After update, run `objdump --version | head -1` and confirm version is 2.27 or higher.📡 Detection & Monitoring
Log Indicators:
- Segmentation fault or crash logs from cxxfilt, objdump, or readelf processes
- Abnormal process termination with signal 11 (SIGSEGV)
Network Indicators:
- Unusual PE file uploads to systems running BinUtils tools
SIEM Query:
process_name IN ('cxxfilt', 'objdump', 'readelf') AND exit_code = 139