CVE-2025-23114: Veeam Updater MITM RCE Vulnerability

CVE-2025-23114 Overview

A vulnerability in Veeam Updater component allows Man-in-the-Middle attackers to execute arbitrary code on the affected server. This issue occurs due to a failure to properly validate TLS certificate.

Critical Impact
This vulnerability allows attackers to potentially gain full control over the affected server, posing significant risk to data confidentiality, integrity, and availability.

Affected Products

Veeam Backup & Replication
Veeam Agent for Microsoft Windows
Veeam ONE

Discovery Timeline

2025-02-05 - CVE-2025-23114 published to NVD
2025-03-13 - Last updated in NVD database

Technical Details for CVE-2025-23114

Vulnerability Analysis

The vulnerability is classified under CWE-295, where the application fails to properly validate the authenticity of TLS certificates, allowing malicious actors to perform a Man-in-the-Middle attack. By exploiting this weakness, an attacker can intercept and modify network traffic between the Veeam server and client, leading to arbitrary code execution.

Root Cause

The absence of stringent certificate validation allows unauthorized certificates to be accepted, enabling potential interception of encrypted communications.

Attack Vector

This vulnerability requires network-level access and can be exploited remotely via a Man-in-the-Middle attack.

python

# Example exploitation code (sanitized)
import ssl
import socket

hostname = 'target.veeam.server'
context = ssl.SSLContext(ssl.PROTOCOL_TLS_CLIENT)
context.load_verify_locations('malicious.crt')
sock = socket.create_connection((hostname, 443))
ssl_sock = context.wrap_socket(sock, server_hostname=hostname)

Detection Methods for CVE-2025-23114

Indicators of Compromise

Unexpected outgoing connections from Veeam server
Alteration of network traffic
SSL certificate anomalies

Detection Strategies

Deploy intrusion detection systems (IDS) to monitor for unusual traffic patterns and SSL discrepancies. SentinelOne’s advanced network detection capabilities can identify and flag suspicious communication indicative of a Man-in-the-Middle attack.

Monitoring Recommendations

Regularly audit network traffic for signs of interception and verify all SSL/TLS handshakes for authenticity. Utilize SentinelOne to automate these checks and provide alerts on deviations from expected behavior.

How to Mitigate CVE-2025-23114

Immediate Actions Required

Update Veeam software to the latest patched version
Implement strict network segmentation
Enforce strong TLS configuration

Patch Information

Refer to Veeam KB4712 for detailed patch information and update instructions.

Workarounds

As a temporary measure, implement strict network monitoring and deploy transparent proxies that enforce certificate validation.

bash

# Configuration example
iptables -A FORWARD -p tcp --dport 443 -m state --state NEW -j ACCEPT
iptables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT