CVE-2023-39699
📋 TL;DR
IceWarp Mail Server v10.4.5 contains a local file inclusion vulnerability in the /calendar/minimizer/index.php component that allows attackers to read or execute files from the server's local file system. This affects organizations running the vulnerable version of IceWarp Mail Server. The high CVSS score of 9.8 indicates critical severity.
💻 Affected Systems
- IceWarp Mail Server
📦 What is this software?
Mail Server by Icewarp
⚠️ Risk & Real-World Impact
Worst Case
Complete server compromise leading to data theft, ransomware deployment, or use as a pivot point into internal networks.
Likely Case
Sensitive file disclosure (configuration files, credentials, user data) and potential remote code execution.
If Mitigated
Limited file read access if proper file permissions and web server restrictions are in place.
🎯 Exploit Status
LFI vulnerabilities typically have simple exploitation paths. The provided references suggest detailed technical information is available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown - check vendor for updates
Vendor Advisory: Not provided in CVE references
Restart Required: Yes
Instructions:
1. Check IceWarp vendor website for security updates. 2. Apply any available patch for v10.4.5 or upgrade to a fixed version. 3. Restart IceWarp services after patching.
🔧 Temporary Workarounds
Web Server Access Restriction
allBlock access to the vulnerable /calendar/minimizer/index.php component
# Apache: RewriteRule ^/calendar/minimizer/index\.php - [F,L]
# Nginx: location ~ ^/calendar/minimizer/index\.php { deny all; }
File Permission Restriction
linux/windowsRestrict web server user permissions to limit file access
# Linux: chmod 750 /path/to/icewarp/webroot
# Windows: icacls "C:\Program Files\IceWarp\web" /deny IUSR:(OI)(CI)(RX)
🧯 If You Can't Patch
- Implement strict network segmentation to isolate the IceWarp server from sensitive systems
- Deploy a web application firewall (WAF) with LFI protection rules
🔍 How to Verify
Check if Vulnerable:
Test if /calendar/minimizer/index.php accepts file path parameters (e.g., ?file=../../etc/passwd) and returns file contentsCheck Version:
# Windows: Check IceWarp About dialog or installation directory
# Linux: /opt/icewarp/version.txt or icewarp --versionVerify Fix Applied:
Retest the vulnerable endpoint after patching/workarounds - should return error or no file content📡 Detection & Monitoring
Log Indicators:
- HTTP requests to /calendar/minimizer/index.php with suspicious parameters
- File access patterns from web server process to unexpected directories
Network Indicators:
- Unusual outbound connections from IceWarp server
- Traffic patterns suggesting data exfiltration
SIEM Query:
source="web_logs" AND uri="/calendar/minimizer/index.php" AND (param="file" OR param="path" OR param="include")🔗 References
- https://cwe.mitre.org/data/definitions/98.html
- https://drive.google.com/file/d/1NkqL4ySJApyPy8B-zDC7vE-QMBQAu8OU
- https://owasp.org/www-project-web-security-testing-guide/v42/4-Web_Application_Security_Testing/07-Input_Validation_Testing/11.1-Testing_for_Local_File_Inclusion
- https://cwe.mitre.org/data/definitions/98.html
- https://drive.google.com/file/d/1NkqL4ySJApyPy8B-zDC7vE-QMBQAu8OU
- https://owasp.org/www-project-web-security-testing-guide/v42/4-Web_Application_Security_Testing/07-Input_Validation_Testing/11.1-Testing_for_Local_File_Inclusion
