CVE-2023-2523
📋 TL;DR
This critical vulnerability in Weaver E-Office 9.5 allows remote attackers to upload arbitrary files without restrictions via the mobile_upload_save function. This can lead to remote code execution and complete system compromise. Organizations using Weaver E-Office 9.5 are affected.
💻 Affected Systems
- Weaver E-Office
📦 What is this software?
E Office by E Office
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system takeover, data exfiltration, ransomware deployment, and lateral movement within the network.
Likely Case
Webshell upload leading to persistent backdoor access, data theft, and potential privilege escalation.
If Mitigated
File upload attempts blocked at WAF or detected by security monitoring with no successful exploitation.
🎯 Exploit Status
Exploit details are publicly available on GitHub. The vulnerability requires minimal technical skill to exploit.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: No
Instructions:
No official patch available. Consider upgrading to a newer version if available or implementing workarounds.
🔧 Temporary Workarounds
Block vulnerable endpoint
allBlock access to the vulnerable ajax.php endpoint at the web server or WAF level
# Apache: RewriteRule ^App/Ajax/ajax\.php\?action=mobile_upload_save - [F,L]
# Nginx: location ~* /App/Ajax/ajax\.php\?action=mobile_upload_save { return 403; }
Restrict file upload types
allConfigure web application firewall to block suspicious file uploads
# ModSecurity rule: SecRule ARGS:upload_quwan "@rx \.(php|asp|aspx|jsp|pl)" "id:1001,phase:2,deny,msg:'Blocked malicious file upload'"
🧯 If You Can't Patch
- Isolate the Weaver E-Office server in a separate network segment with strict firewall rules
- Implement application-level monitoring for file upload activities and suspicious POST requests to ajax.php
🔍 How to Verify
Check if Vulnerable:
Check if Weaver E-Office version 9.5 is installed and test file upload functionality at /App/Ajax/ajax.php?action=mobile_upload_saveCheck Version:
Check application version in admin panel or look for version files in installation directoryVerify Fix Applied:
Test if file upload restrictions are properly enforced and the vulnerable endpoint is blocked📡 Detection & Monitoring
Log Indicators:
- POST requests to /App/Ajax/ajax.php with action=mobile_upload_save
- File uploads with suspicious extensions (.php, .jsp, .asp)
- Unusual file creation in upload directories
Network Indicators:
- HTTP POST requests to vulnerable endpoint with file upload parameters
- Outbound connections from the Weaver server to unknown IPs
SIEM Query:
source="weaver_logs" AND (url="/App/Ajax/ajax.php" AND parameters CONTAINS "mobile_upload_save")