CVE-2022-26500
📋 TL;DR
CVE-2022-26500 is a path traversal vulnerability in Veeam Backup & Replication that allows authenticated remote attackers to access internal API functions. This enables them to upload and execute arbitrary code on affected systems. Organizations using Veeam Backup & Replication versions 9.5U3 through 11.x are vulnerable.
💻 Affected Systems
- Veeam Backup & Replication
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise leading to ransomware deployment, data exfiltration, or lateral movement across the network
Likely Case
Backup server compromise allowing attackers to access sensitive backup data and potentially deploy malware
If Mitigated
Limited impact if proper network segmentation and authentication controls prevent access to vulnerable components
🎯 Exploit Status
CISA has added this to their Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Veeam Backup & Replication 11a (11.0.1.1261) and later
Vendor Advisory: https://www.veeam.com/kb4288
Restart Required: Yes
Instructions:
1. Download the latest cumulative patch from Veeam's website. 2. Apply the patch to all Veeam Backup & Replication servers. 3. Restart the Veeam Backup Service. 4. Verify the patch is applied by checking the version.
🔧 Temporary Workarounds
Network Segmentation
allRestrict access to Veeam Backup & Replication servers to only authorized management networks
Authentication Hardening
allImplement multi-factor authentication and strong password policies for Veeam administrative accounts
🧯 If You Can't Patch
- Isolate Veeam Backup & Replication servers from the internet and restrict internal access using firewall rules
- Implement strict monitoring and alerting for unusual API calls or file uploads to Veeam servers
🔍 How to Verify
Check if Vulnerable:
Check Veeam Backup & Replication version in the console or via PowerShell: Get-VBRVersionCheck Version:
Get-VBRVersion (PowerShell) or check Help > About in Veeam consoleVerify Fix Applied:
Verify version is 11.0.1.1261 or later, or check that patch KB4288 is installed📡 Detection & Monitoring
Log Indicators:
- Unusual API calls to Veeam services
- Unexpected file uploads to Veeam server paths
- Authentication attempts from unusual sources
Network Indicators:
- Unusual traffic to Veeam Backup Service ports (9392/TCP, 9393/TCP)
- HTTP requests to internal Veeam API endpoints
SIEM Query:
source="veeam*" AND (event_type="api_call" OR event_type="file_upload") AND NOT user IN ["authorized_users"]