CVE-2023-34798
📋 TL;DR
This vulnerability allows attackers to upload malicious files to eOffice systems, potentially leading to remote code execution. It affects eOffice versions before 9.5, putting organizations using this software at risk of complete system compromise.
💻 Affected Systems
- eOffice
📦 What is this software?
E Office by Weaver
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with attacker gaining administrative privileges, data exfiltration, ransomware deployment, and persistent backdoor installation.
Likely Case
Webshell deployment leading to data theft, lateral movement within the network, and disruption of business operations.
If Mitigated
Limited impact with proper file upload restrictions, web application firewalls, and network segmentation preventing code execution.
🎯 Exploit Status
Proof of concept available in public GitHub gists, requires authentication but file upload functionality is commonly accessible
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 9.5
Vendor Advisory: Not publicly available
Restart Required: Yes
Instructions:
1. Backup current installation and data. 2. Download eOffice version 9.5 or later from official vendor. 3. Follow vendor upgrade instructions. 4. Restart application services. 5. Verify successful upgrade.
🔧 Temporary Workarounds
File Upload Restriction
allImplement strict file type validation and size limits on upload endpoints
Configure web server to block uploads of executable file types (.php, .jsp, .asp, .exe, etc.)
Web Application Firewall Rules
allDeploy WAF rules to detect and block malicious file upload attempts
Add WAF rules to inspect file upload requests for suspicious patterns
🧯 If You Can't Patch
- Implement strict network segmentation to isolate eOffice from critical systems
- Deploy runtime application self-protection (RASP) or host-based intrusion prevention
🔍 How to Verify
Check if Vulnerable:
Check eOffice version in admin panel or configuration files. If version is below 9.5, system is vulnerable.Check Version:
Check admin panel or examine application configuration files for version informationVerify Fix Applied:
Verify version is 9.5 or higher and test file upload functionality with restricted file types.📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads to eOffice endpoints
- Uploads of executable file types
- Multiple failed upload attempts
Network Indicators:
- HTTP POST requests to file upload endpoints with suspicious file extensions
- Outbound connections from eOffice server to unknown IPs
SIEM Query:
source="eoffice" AND (url="*upload*" OR url="*file*" OR method="POST") AND (file_extension="php" OR file_extension="jsp" OR file_extension="asp" OR file_extension="exe")