CVE-2025-3845
📋 TL;DR
A critical buffer overflow vulnerability in markparticle WebServer up to version 1.0 allows remote attackers to execute arbitrary code or cause denial of service. The vulnerability exists in the Buffer::HasWritten function where manipulation of the writePos_ argument leads to memory corruption. Any system running the vulnerable WebServer software is affected.
💻 Affected Systems
- markparticle WebServer
📦 What is this software?
Webserver by Markparticle
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or ransomware deployment
Likely Case
Denial of service (crash) or limited remote code execution depending on exploit sophistication
If Mitigated
Denial of service with limited impact if proper network segmentation and least privilege are implemented
🎯 Exploit Status
Exploit has been publicly disclosed and remote exploitation is straightforward
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: Yes
Instructions:
1. Check vendor website for updates
2. If patch available, download and install
3. Restart WebServer service
4. Verify patch is applied
🔧 Temporary Workarounds
Network Segmentation
linuxRestrict access to WebServer using firewall rules
iptables -A INPUT -p tcp --dport [webserver_port] -s [trusted_ips] -j ACCEPT
iptables -A INPUT -p tcp --dport [webserver_port] -j DROP
Service Disablement
linuxTemporarily disable the WebServer service
systemctl stop markparticle-webserver
systemctl disable markparticle-webserver
🧯 If You Can't Patch
- Replace with alternative web server software
- Implement strict network access controls and monitor for exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check WebServer version: grep -i version /path/to/webserver/config or check running processCheck Version:
strings /path/to/webserver/binary | grep -i versionVerify Fix Applied:
Verify version is greater than 1.0 or check for updated binary hash📡 Detection & Monitoring
Log Indicators:
- WebServer crash logs
- Abnormal memory access patterns
- Unexpected process termination
Network Indicators:
- Unusual traffic patterns to WebServer port
- Exploit kit signatures in network traffic
SIEM Query:
source="webserver.log" AND ("crash" OR "segmentation fault" OR "buffer overflow")