CVE-2021-41067
📋 TL;DR
This vulnerability in Listary allows attackers to intercept software updates via man-in-the-middle (MITM) attacks due to insecure HTTP connections and lack of package validation. Successful exploitation could lead to installation of malicious software on affected systems. Users of Listary version 6 and earlier are affected.
💻 Affected Systems
- Listary
📦 What is this software?
Listary by Listary
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise through installation of malicious software with system privileges, potentially leading to data theft, ransomware deployment, or persistent backdoor installation.
Likely Case
Installation of malware, spyware, or adware through manipulated update packages, leading to data exfiltration or system instability.
If Mitigated
No impact if proper network controls prevent MITM attacks or if updates are disabled.
🎯 Exploit Status
Exploitation requires MITM position on the network. Public proof-of-concept demonstrates the attack methodology.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version 6.1 or later
Vendor Advisory: https://www.listary.com/download
Restart Required: Yes
Instructions:
1. Download latest version from official Listary website. 2. Install the update. 3. Restart the system if prompted.
🔧 Temporary Workarounds
Disable automatic updates
windowsPrevent Listary from automatically checking for and downloading updates
Open Listary settings > General > Uncheck 'Automatically check for updates'
Network segmentation
allIsolate Listary systems from untrusted networks
🧯 If You Can't Patch
- Disable Listary automatic updates in application settings
- Implement network controls to prevent MITM attacks (HTTPS inspection, certificate pinning, network segmentation)
🔍 How to Verify
Check if Vulnerable:
Check Listary version in Help > About. If version is 6.0 or earlier, system is vulnerable.Check Version:
Not applicable - check via Listary GUI Help > AboutVerify Fix Applied:
Verify Listary version is 6.1 or later in Help > About menu.📡 Detection & Monitoring
Log Indicators:
- Unusual network connections to update servers
- Failed update attempts from unexpected sources
Network Indicators:
- HTTP connections to Listary update servers without TLS
- Unusual outbound traffic patterns during update checks
SIEM Query:
destination_port:80 AND (destination_ip:listary_update_server OR user_agent:Listary*)