CVE-2024-11182
📋 TL;DR
This is a cross-site scripting (XSS) vulnerability in MDaemon Email Server that allows attackers to inject malicious JavaScript via HTML email messages. When exploited, it enables arbitrary code execution in webmail users' browsers. Organizations running vulnerable versions of MDaemon Email Server are affected.
💻 Affected Systems
- MDaemon Email Server
📦 What is this software?
Mdaemon by Mdaemon
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal session cookies, credentials, or sensitive email data, perform account takeover, or deliver malware to users' systems through the webmail interface.
Likely Case
Attackers would typically steal session cookies to hijack webmail sessions, potentially accessing sensitive emails and contacts.
If Mitigated
With proper web application firewalls and content security policies, the impact would be limited to isolated session compromise.
🎯 Exploit Status
Exploitation requires sending a malicious HTML email to a target user who views it in webmail. The attacker needs to know a valid email address.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 24.5.1c
Vendor Advisory: https://files.mdaemon.com/mdaemon/beta/RelNotes_en.html
Restart Required: Yes
Instructions:
1. Download MDaemon version 24.5.1c or later from the vendor website. 2. Backup current configuration and data. 3. Run the installer to upgrade. 4. Restart MDaemon services.
🔧 Temporary Workarounds
Disable HTML email rendering
windowsConfigure MDaemon to display emails as plain text only in webmail
Implement Content Security Policy
allAdd CSP headers to block inline JavaScript execution
🧯 If You Can't Patch
- Deploy a web application firewall (WAF) with XSS protection rules
- Restrict webmail access to trusted networks only using firewall rules
🔍 How to Verify
Check if Vulnerable:
Check MDaemon version in the web interface under Help > About or via the Windows Services panelCheck Version:
Not applicable - check via GUI or Windows ServicesVerify Fix Applied:
Verify version is 24.5.1c or higher and test with safe XSS payloads in test emails📡 Detection & Monitoring
Log Indicators:
- Unusual email patterns with HTML/JavaScript content
- Multiple failed login attempts from new locations
Network Indicators:
- Suspicious HTML emails with JavaScript in img tags
- Unexpected outbound connections from webmail servers
SIEM Query:
source="mdaemon" AND (message="*javascript*" OR message="*<img*onerror*" OR message="*<img*src=javascript:*")