CVE-2024-3783
📋 TL;DR
CVE-2024-3783 is a path traversal vulnerability in WBSAirback 21.02.04 that allows low-privileged users to download arbitrary files from the system. This affects organizations using the vulnerable version of WBSAirback backup software. Attackers can access sensitive system files through the Backup Agents interface.
💻 Affected Systems
- WBSAirback
📦 What is this software?
Wbsairback by Whitebearsolutions
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise through retrieval of sensitive configuration files, credentials, or SSH keys leading to lateral movement and data exfiltration.
Likely Case
Unauthorized access to backup data, configuration files, and potentially sensitive system information stored in accessible directories.
If Mitigated
Limited file access restricted by proper file permissions and network segmentation, preventing critical system file exposure.
🎯 Exploit Status
Exploitation requires authenticated low-privileged access. The path traversal technique is well-documented and easy to implement.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Update to latest version beyond 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. Download latest WBSAirback version from vendor. 2. Backup current configuration. 3. Install update following vendor documentation. 4. Restart WBSAirback services. 5. Verify functionality.
🔧 Temporary Workarounds
Restrict Backup Agent Access
allLimit access to Backup Agents interface to only necessary administrative users
# Configure access controls in WBSAirback admin interface
# Use firewall rules to restrict access to WBSAirback web interface
File System Permissions Hardening
linuxApply strict file permissions to sensitive directories and files
chmod 750 /path/to/sensitive/directories
chown root:root /path/to/critical/files
🧯 If You Can't Patch
- Implement strict network segmentation to isolate WBSAirback from critical systems
- Apply principle of least privilege to all WBSAirback user accounts and monitor for suspicious file access patterns
🔍 How to Verify
Check if Vulnerable:
Check WBSAirback version in admin interface or configuration files. Version 21.02.04 is vulnerable.Check Version:
grep 'version' /etc/wbsairback/config.conf or check web interface admin panelVerify Fix Applied:
Verify version is updated beyond 21.02.04 and test path traversal attempts in Backup Agents interface return proper access denied errors.📡 Detection & Monitoring
Log Indicators:
- Unusual file access patterns in WBSAirback logs
- Multiple failed path traversal attempts
- Access to system files from Backup Agents interface
Network Indicators:
- Unusual file download patterns from WBSAirback server
- Traffic to unexpected file paths in HTTP requests
SIEM Query:
source="wbsairback.log" AND ("path traversal" OR "../" OR "..\" OR "directory traversal")