CVE-2024-6740
📋 TL;DR
Openfind Mail2000 has a stored cross-site scripting (XSS) vulnerability in email attachment handling. Unauthenticated remote attackers can inject malicious JavaScript via attachments, which executes when victims view the attachments. This affects all Mail2000 users who process email attachments.
💻 Affected Systems
- Openfind Mail2000
📦 What is this software?
Mail2000 by Openfind
Mail2000 by Openfind
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal session cookies, perform account takeover, redirect users to malicious sites, or deploy malware through client-side attacks.
Likely Case
Session hijacking, credential theft, or phishing attacks against users who view malicious attachments.
If Mitigated
Limited impact with proper content security policies, input validation, and user awareness training.
🎯 Exploit Status
XSS vulnerabilities are commonly exploited; no public exploit code needed for basic attacks.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Openfind security advisory for specific patched versions
Vendor Advisory: https://www.openfind.com.tw/taiwan/download/Openfind_OF-ISAC-24-007.pdf
Restart Required: Yes
Instructions:
1. Download the security patch from Openfind. 2. Apply the patch according to vendor instructions. 3. Restart Mail2000 services. 4. Verify the fix.
🔧 Temporary Workarounds
Implement Content Security Policy
allAdd CSP headers to restrict script execution from untrusted sources
Add 'Content-Security-Policy' header to web server configuration
Disable HTML rendering for attachments
allConfigure Mail2000 to display attachments as plain text or download only
Configure via Mail2000 admin interface
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to block XSS payloads in attachments
- Educate users to avoid opening suspicious attachments and use alternative email clients temporarily
🔍 How to Verify
Check if Vulnerable:
Test by uploading an attachment with JavaScript payload and checking if it executes when viewedCheck Version:
Check Mail2000 admin interface or version files in installation directoryVerify Fix Applied:
After patching, test the same XSS payload to confirm it's properly sanitized📡 Detection & Monitoring
Log Indicators:
- Unusual attachment uploads, JavaScript in attachment filenames or content
Network Indicators:
- HTTP requests with suspicious attachment parameters
SIEM Query:
search for 'attachment' AND ('script' OR 'javascript' OR 'onload' OR 'onerror') in web logs🔗 References
- https://www.openfind.com.tw/taiwan/download/Openfind_OF-ISAC-24-007.pdf
- https://www.twcert.org.tw/en/cp-139-7939-3423f-2.html
- https://www.twcert.org.tw/tw/cp-132-7938-d9c97-1.html
- https://www.openfind.com.tw/taiwan/download/Openfind_OF-ISAC-24-007.pdf
- https://www.twcert.org.tw/en/cp-139-7939-3423f-2.html
- https://www.twcert.org.tw/tw/cp-132-7938-d9c97-1.html
