CVE-2020-29659
📋 TL;DR
A buffer overflow vulnerability in Flexense DupScout Enterprise web server allows remote unauthenticated attackers to execute arbitrary code with SYSTEM privileges by sending a specially crafted GET request. This affects all systems running the vulnerable version of DupScout Enterprise with the web server enabled. Attackers can gain complete control over affected systems.
💻 Affected Systems
- Flexense DupScout Enterprise
📦 What is this software?
Dupscout by Flexense
⚠️ Risk & Real-World Impact
Worst Case
Remote attacker gains SYSTEM-level code execution, leading to complete system compromise, data theft, ransomware deployment, and lateral movement within the network.
Likely Case
Remote code execution leading to installation of malware, backdoors, or cryptocurrency miners on vulnerable systems.
If Mitigated
If web server is disabled or network access is restricted, impact is limited to denial of service or local exploitation only.
🎯 Exploit Status
Public exploit code is available on Exploit-DB (ID 49217). The attack requires sending a specially crafted GET request to the web server.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 10.0.19 or later
Vendor Advisory: https://www.dupscout.com
Restart Required: Yes
Instructions:
1. Download latest version from vendor website. 2. Uninstall current version. 3. Install updated version. 4. Restart the service/system.
🔧 Temporary Workarounds
Disable DupScout Web Server
windowsDisable the vulnerable web server component to prevent remote exploitation
Stop the DupScout service via Services.msc or 'net stop DupScout'
Disable the service from starting automatically
Network Access Control
windowsRestrict network access to DupScout web server port
Windows Firewall: New-InboundFirewallRule -DisplayName 'Block DupScout' -Direction Inbound -LocalPort 80,443 -Protocol TCP -Action Block
netsh advfirewall firewall add rule name='Block DupScout' dir=in action=block protocol=TCP localport=80,443
🧯 If You Can't Patch
- Disable the DupScout web server service completely
- Implement strict network segmentation and firewall rules to block all external and unnecessary internal access to the DupScout web interface
🔍 How to Verify
Check if Vulnerable:
Check DupScout version via Help > About menu or examine installed programs in Control Panel. If version is 10.0.18 or earlier, system is vulnerable.Check Version:
wmic product where name='DupScout Enterprise' get versionVerify Fix Applied:
Verify installed version is 10.0.19 or later. Test by attempting to access the web interface and checking service status.📡 Detection & Monitoring
Log Indicators:
- Unusual GET requests to /settings with long sid parameters
- DupScout service crashes or unexpected restarts
- Windows Event Log entries showing service failures
Network Indicators:
- HTTP GET requests to /settings&sid= with unusually long parameters
- Traffic to DupScout web server port (default 80/443) with exploit patterns
SIEM Query:
source="*" AND (url="/settings&sid=" OR user_agent="*" AND url CONTAINS "sid=")