CVE-2024-3796
📋 TL;DR
A stored cross-site scripting (XSS) vulnerability in WBSAirback 21.02.04 allows attackers to inject malicious scripts into the description field of the BackupSchedule admin page. When an administrator views the compromised backup schedule, the script executes in their browser context, potentially stealing session cookies or performing actions as the administrator. This affects all WBSAirback 21.02.04 installations with admin access.
💻 Affected Systems
- WBSAirback
📦 What is this software?
Wbsairback by Whitebearsolutions
⚠️ Risk & Real-World Impact
Worst Case
Administrator session hijacking leading to full system compromise, data theft, or ransomware deployment.
Likely Case
Session cookie theft allowing attacker to impersonate administrators and access backup management functions.
If Mitigated
Limited impact if proper input validation and output encoding are implemented.
🎯 Exploit Status
Exploitation requires admin privileges to inject XSS payload into description field. Attack is stored/persistent.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Update to version later than 21.02.04
Vendor Advisory: https://www.incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities-wbsairback-white-bear-solutions
Restart Required: Yes
Instructions:
1. Backup current configuration. 2. Download latest WBSAirback version from vendor. 3. Install update following vendor documentation. 4. Restart WBSAirback services. 5. Verify functionality.
🔧 Temporary Workarounds
Input Validation Filter
linuxImplement server-side input validation to sanitize description field inputs.
# Requires modifying WBSAirback source code to add input sanitization
Web Application Firewall (WAF)
allDeploy WAF with XSS protection rules to block malicious payloads.
# Configure WAF rules to detect and block XSS patterns in POST requests to /admin/BackupSchedule
🧯 If You Can't Patch
- Restrict admin interface access to trusted IP addresses only using firewall rules.
- Implement Content Security Policy (CSP) headers to mitigate XSS impact.
🔍 How to Verify
Check if Vulnerable:
Check WBSAirback version via admin interface or configuration files. If version is 21.02.04, system is vulnerable.Check Version:
grep -i version /path/to/wbsairback/config/files or check admin dashboardVerify Fix Applied:
After update, verify version is newer than 21.02.04 and test XSS payload injection in description field is blocked.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /admin/BackupSchedule with script tags or JavaScript in parameters
- Multiple failed login attempts followed by admin access
Network Indicators:
- HTTP requests containing <script> tags or JavaScript functions in description parameter
SIEM Query:
source="web_logs" AND uri_path="/admin/BackupSchedule" AND (description CONTAINS "<script>" OR description CONTAINS "javascript:")