CVE-2025-70314
📋 TL;DR
CVE-2025-70314 is a critical buffer overflow vulnerability in webfsd 1.21 that allows remote attackers to execute arbitrary code by sending a specially crafted request. This affects all systems running the vulnerable version of webfsd web server software. Attackers can exploit this without authentication to potentially take complete control of affected systems.
💻 Affected Systems
- webfsd
📦 What is this software?
Webfsd by Ourway
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, ransomware deployment, or use as a foothold for lateral movement within the network.
Likely Case
Remote code execution resulting in system compromise, web server takeover, and potential data exfiltration or malware installation.
If Mitigated
Denial of service or application crash if exploit attempts are blocked by network controls or security products.
🎯 Exploit Status
Proof of concept is available in the GitHub gist reference. The high CVSS score and public PoC make weaponization likely.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Check webfsd version with 'webfsd -v' or package manager. 2. If version is 1.21, consider alternative web servers until a patch is released. 3. Monitor the GitHub repository for updates. 4. Apply any future patches immediately when available.
🔧 Temporary Workarounds
Disable webfsd service
linuxStop and disable the webfsd service to prevent exploitation
sudo systemctl stop webfsd
sudo systemctl disable webfsd
Network segmentation and firewall rules
linuxRestrict access to webfsd ports using firewall rules
sudo iptables -A INPUT -p tcp --dport 80 -j DROP
sudo iptables -A INPUT -p tcp --dport 443 -j DROP
🧯 If You Can't Patch
- Replace webfsd with alternative web server software like nginx or Apache
- Implement network-based intrusion prevention systems (IPS) to detect and block exploit attempts
🔍 How to Verify
Check if Vulnerable:
Run 'webfsd -v' and check if output shows version 1.21. Alternatively, check package manager: 'dpkg -l | grep webfsd' or 'rpm -qa | grep webfsd'.Check Version:
webfsd -vVerify Fix Applied:
After applying any future patch, verify version is no longer 1.21 using 'webfsd -v'. Test with controlled exploit attempts if possible.📡 Detection & Monitoring
Log Indicators:
- Unusual long filename requests in webfsd logs
- Multiple failed requests with malformed filenames
- Sudden service crashes or restarts
Network Indicators:
- HTTP requests with unusually long filenames
- Requests containing buffer overflow patterns
- Traffic to webfsd ports from suspicious sources
SIEM Query:
source="webfsd" AND (filename="*[very long string]*" OR status="500" OR message="*segmentation fault*")