CVE-2023-44206
📋 TL;DR
CVE-2023-44206 is an authorization bypass vulnerability in Acronis Cyber Protect 15 that allows attackers to access and manipulate sensitive information without proper authentication. This affects all Acronis Cyber Protect 15 installations on Linux and Windows systems before build 35979. The vulnerability stems from improper authorization checks in the application's access control mechanisms.
💻 Affected Systems
- Acronis Cyber Protect 15
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of backup data including ability to exfiltrate, modify, or delete sensitive backup archives, potentially leading to data destruction, ransomware deployment, or credential theft from backup contents.
Likely Case
Unauthorized access to backup data allowing attackers to read sensitive information, modify backup integrity, or disrupt backup operations.
If Mitigated
Limited impact with proper network segmentation, strong authentication controls, and regular security monitoring in place.
🎯 Exploit Status
The vulnerability allows bypassing authorization without authentication, making exploitation straightforward once the attack vector is identified.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Build 35979 or later
Vendor Advisory: https://security-advisory.acronis.com/advisories/SEC-5839
Restart Required: Yes
Instructions:
1. Download Acronis Cyber Protect 15 build 35979 or later from official Acronis portal. 2. Backup current configuration. 3. Install the update following Acronis documentation. 4. Restart all Acronis services. 5. Verify successful update and functionality.
🔧 Temporary Workarounds
Network Segmentation
allRestrict network access to Acronis management interfaces to trusted IP addresses only
# Use firewall rules to restrict access to Acronis ports (default 9876, 443)
Access Control Hardening
allImplement additional authentication layers and monitor for unauthorized access attempts
# Configure additional authentication mechanisms if available
🧯 If You Can't Patch
- Isolate Acronis systems from internet and restrict internal network access to only necessary administrative workstations
- Implement strict monitoring and alerting for any unauthorized access attempts to Acronis management interfaces
🔍 How to Verify
Check if Vulnerable:
Check Acronis Cyber Protect version in management console or via command line: On Windows: Check program version in Control Panel > Programs. On Linux: Check installed package version.Check Version:
Windows: wmic product where name="Acronis Cyber Protect" get version. Linux: rpm -qa | grep acronis or dpkg -l | grep acronisVerify Fix Applied:
Verify build number is 35979 or higher in Acronis management console under Help > About or via version check commands.📡 Detection & Monitoring
Log Indicators:
- Unauthorized access attempts to Acronis management interfaces
- Unexpected backup modifications or access patterns
- Authentication bypass attempts in application logs
Network Indicators:
- Unusual traffic to Acronis management ports (9876, 443) from unauthorized sources
- Data exfiltration patterns from backup storage
SIEM Query:
source="acronis_logs" AND (event_type="auth_failure" OR event_type="unauthorized_access")