CVE-2021-37778
📋 TL;DR
CVE-2021-37778 is a buffer overflow vulnerability in gps-sdr-sim v1.0 that occurs when processing excessively long command line parameters. This allows attackers to cause denial of service or potentially execute arbitrary code. Anyone using the vulnerable version of gps-sdr-sim is affected.
💻 Affected Systems
- gps-sdr-sim
📦 What is this software?
Gps Sdr Sim by Gps Sdr Sim Project
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution with full system compromise, allowing attackers to take complete control of the affected system.
Likely Case
Denial of service causing the gps-sdr-sim application to crash, disrupting GPS signal simulation functionality.
If Mitigated
Limited impact with proper input validation and boundary checking in place, preventing buffer overflow.
🎯 Exploit Status
The buffer overflow is triggered via command line parameters, making exploitation straightforward for attackers with access to execute the application.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version 1.1 or later
Vendor Advisory: https://github.com/osqzss/gps-sdr-sim/issues/294
Restart Required: No
Instructions:
1. Download the latest version from the official GitHub repository. 2. Replace the existing gps-sdr-sim binary with the updated version. 3. Verify the installation by checking the version number.
🔧 Temporary Workarounds
Input Validation Wrapper
linuxCreate a wrapper script that validates command line parameter length before passing to gps-sdr-sim
#!/bin/bash
MAX_LEN=1000
if [ ${#1} -gt $MAX_LEN ] || [ ${#2} -gt $MAX_LEN ]; then
echo "Error: Parameters too long"
exit 1
fi
./gps-sdr-sim "$1" "$2"
🧯 If You Can't Patch
- Restrict execution permissions to trusted users only
- Implement network segmentation to isolate systems running gps-sdr-sim
🔍 How to Verify
Check if Vulnerable:
Check if gps-sdr-sim version is 1.0 by running: ./gps-sdr-sim --versionCheck Version:
./gps-sdr-sim --versionVerify Fix Applied:
After updating, run: ./gps-sdr-sim --version | grep -q "1.1" && echo "Patched" || echo "Still vulnerable"📡 Detection & Monitoring
Log Indicators:
- Segmentation fault errors in system logs
- Application crash logs mentioning gps-sdr-sim
Network Indicators:
- Unusual command line parameters being passed to gps-sdr-sim processes
SIEM Query:
process_name:"gps-sdr-sim" AND (command_line:"*AAAAAAAA*" OR exit_code:139)