CVE-2024-34959
📋 TL;DR
DedeCMS V5.7.113 contains a cross-site scripting vulnerability in sys_data_replace.php that allows attackers to inject malicious scripts into web pages. This affects administrators and users who view compromised pages, potentially leading to session hijacking or credential theft. The vulnerability requires administrative access to exploit.
💻 Affected Systems
- DedeCMS
📦 What is this software?
Dedecms by Dedecms
⚠️ Risk & Real-World Impact
Worst Case
Administrator account compromise leading to complete website takeover, data theft, and further server exploitation.
Likely Case
Session hijacking of administrators, credential theft, defacement of administrative interfaces.
If Mitigated
Limited impact with proper input validation and output encoding in place.
🎯 Exploit Status
Exploitation requires administrative privileges but is straightforward once access is obtained.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: V5.7.114 or later
Vendor Advisory: https://gitee.com/upgogo/s123/issues/I9MARO
Restart Required: No
Instructions:
1. Backup your current installation. 2. Download the latest version from official sources. 3. Replace vulnerable files with patched versions. 4. Verify functionality.
🔧 Temporary Workarounds
Input Validation Filter
allAdd input validation to sys_data_replace.php to sanitize user inputs
Edit sys_data_replace.php and add HTML entity encoding for all user inputs
Access Restriction
allRestrict access to sys_data_replace.php to trusted IP addresses only
Add .htaccess rules or web server configuration to limit access
🧯 If You Can't Patch
- Implement Web Application Firewall (WAF) with XSS protection rules
- Disable or remove sys_data_replace.php if not required for functionality
🔍 How to Verify
Check if Vulnerable:
Check if DedeCMS version is 5.7.113 and sys_data_replace.php exists without input validationCheck Version:
Check /data/admin/ver.txt or admin panel version displayVerify Fix Applied:
Verify version is 5.7.114 or later, and test XSS payloads are properly sanitized📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to sys_data_replace.php with script tags
- Multiple failed login attempts followed by successful admin login
Network Indicators:
- HTTP requests containing script injections to administrative endpoints
- Unusual outbound connections from the server
SIEM Query:
source="web_server" AND (uri="/sys_data_replace.php" AND (body CONTAINS "<script>" OR body CONTAINS "javascript:"))