CVE-2023-22902
📋 TL;DR
Openfind Mail2000's file upload function has insufficient input filtering, allowing authenticated users to inject JavaScript. This enables cross-site scripting (XSS) attacks against other users. Only authenticated users with general privileges can exploit this vulnerability.
💻 Affected Systems
- Openfind Mail2000
📦 What is this software?
Mail2000 by Openfind
Mail2000 by Openfind
⚠️ Risk & Real-World Impact
Worst Case
An attacker could steal session cookies, perform actions as other users, or redirect users to malicious sites, potentially leading to account compromise or data theft.
Likely Case
Attackers would typically steal session cookies to hijack user accounts or inject malicious scripts that capture user input.
If Mitigated
With proper input validation and output encoding, the impact would be limited to minor UI disruption without data compromise.
🎯 Exploit Status
XSS exploitation is well-understood; authenticated access requirement reduces immediate threat but increases persistence risk
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified in references
Vendor Advisory: https://www.twcert.org.tw/tw/cp-132-6953-79236-1.html
Restart Required: Yes
Instructions:
1. Check Openfind Mail2000 version. 2. Apply vendor-provided security patch. 3. Restart Mail2000 service. 4. Verify patch installation.
🔧 Temporary Workarounds
Input Validation Enhancement
allImplement server-side validation to sanitize file upload content and reject malicious scripts
Custom implementation required based on Mail2000 configuration
Content Security Policy
allImplement CSP headers to restrict script execution sources
Add 'Content-Security-Policy' header to web server configuration
🧯 If You Can't Patch
- Restrict file upload functionality to trusted users only
- Implement web application firewall rules to detect and block XSS payloads
🔍 How to Verify
Check if Vulnerable:
Test file upload functionality with XSS payloads; if scripts execute without sanitization, system is vulnerableCheck Version:
Check Mail2000 admin interface or configuration files for version informationVerify Fix Applied:
Attempt to upload files containing XSS payloads and verify they are properly sanitized or rejected📡 Detection & Monitoring
Log Indicators:
- Unusual file upload patterns
- JavaScript or script tags in uploaded file names/content
- Multiple failed upload attempts with suspicious content
Network Indicators:
- HTTP requests containing XSS payloads in file upload parameters
- Unusual outbound connections following file uploads
SIEM Query:
source="mail2000" AND (http_method="POST" AND uri_path="*upload*" AND (content="<script>" OR content="javascript:"))