CVE-2025-2861: Arteche Satech BCU Information Disclosure

CVE-2025-2861 Overview

CVE-2025-2861 is a cleartext transmission vulnerability affecting the Arteche SaTECH BCU (Bay Control Unit) firmware version 2.1.3. The device uses the HTTP protocol for web-based management, which transmits all data—including sensitive authentication credentials—in unencrypted plaintext. An attacker with adjacent network access could intercept this traffic to capture credentials and gain legitimate access to the affected device.

Critical Impact

Attackers on the same network segment can intercept authentication credentials transmitted in cleartext, potentially gaining full administrative access to industrial control equipment.

Affected Products

• Arteche SaTECH BCU Firmware version 2.1.3
• Arteche SaTECH BCU hardware devices

Discovery Timeline

• 2025-03-28 - CVE-2025-2861 published to NVD
• 2025-10-10 - Last updated in NVD database

Technical Details for CVE-2025-2861

Vulnerability Analysis

This vulnerability is classified under CWE-319 (Cleartext Transmission of Sensitive Information). The Arteche SaTECH BCU device, commonly deployed in industrial and utility environments for bay control operations, implements a web-based management interface that relies exclusively on HTTP for communication. Unlike HTTPS, HTTP does not encrypt data in transit, leaving all transmitted information vulnerable to interception.

The attack requires adjacent network access, meaning an attacker must be positioned on the same local network segment as the target device. However, once in position, the attacker can passively capture network traffic using common packet sniffing tools. When administrators or operators log into the device's web interface, their credentials are transmitted in cleartext and can be captured directly from the network traffic.

Root Cause

The root cause of this vulnerability is the implementation of HTTP as the communication protocol for the SaTECH BCU web interface without providing HTTPS as an alternative or default. Industrial control units like the SaTECH BCU often handle critical infrastructure operations, making the lack of transport-layer encryption a significant security oversight. The firmware does not enforce or offer TLS/SSL encryption for web management sessions, leaving all HTTP requests and responses exposed to network eavesdropping.

Attack Vector

The attack vector requires the adversary to be on an adjacent network (such as the same LAN or VLAN segment). The attack is passive in nature—the attacker does not need to actively exploit the device but simply monitors network traffic. Using tools such as Wireshark or tcpdump, an attacker can capture HTTP packets containing login requests. These captured packets contain credentials in plaintext within the HTTP headers or POST body, which can then be extracted and used to authenticate to the device legitimately.

The exploitation chain typically follows these steps:

1. The attacker gains access to the same network segment as the SaTECH BCU device
2. Network traffic is captured using packet sniffing tools
3. HTTP traffic to the BCU web interface is filtered and analyzed
4. Credentials are extracted from login request packets
5. The attacker uses the captured credentials to access the device with legitimate user privileges

Detection Methods for CVE-2025-2861

Indicators of Compromise

• Unencrypted HTTP traffic to/from SaTECH BCU devices on ports commonly used for web management (typically port 80)
• Unusual login activity or administrative changes on BCU devices from unexpected sources
• Presence of packet capture tools or ARP spoofing artifacts on network segments containing BCU devices

Detection Strategies

• Monitor network traffic for HTTP sessions to known SaTECH BCU device IP addresses
• Implement network intrusion detection rules to alert on cleartext credential patterns in HTTP traffic
• Review authentication logs on BCU devices for anomalous access patterns or logins from unexpected IP addresses
• Deploy network segmentation monitoring to detect unauthorized devices on industrial control network segments

Monitoring Recommendations

• Implement continuous network traffic analysis on segments containing industrial control equipment
• Configure alerts for any HTTP traffic on networks that should be exclusively using HTTPS
• Monitor for ARP spoofing or man-in-the-middle attack indicators that could precede credential interception
• Establish baseline authentication patterns and alert on deviations

How to Mitigate CVE-2025-2861

Immediate Actions Required

• Isolate SaTECH BCU devices on dedicated, segmented network VLANs with strict access controls
• Implement network-level encryption (such as IPsec VPN tunnels) between management stations and BCU devices
• Restrict physical and logical access to network segments containing affected devices
• Review and rotate credentials for all SaTECH BCU devices as a precautionary measure

Patch Information

Consult the INCIBE Security Notice for official vendor guidance on firmware updates and patches addressing this vulnerability. Contact Arteche directly for the latest firmware version that implements HTTPS support.

Workarounds

• Deploy a reverse proxy with TLS termination in front of SaTECH BCU devices to encrypt web management traffic
• Use a VPN or encrypted tunnel for all administrative access to affected devices
• Implement strict network access controls limiting which hosts can communicate with BCU devices
• Consider physical network isolation for critical industrial control equipment until a firmware update is available

# Example network segmentation using iptables to restrict access to BCU device
# Only allow management traffic from specific trusted management hosts

# Replace 192.168.10.100 with BCU device IP and 192.168.1.50 with trusted admin host
iptables -A INPUT -d 192.168.10.100 -s 192.168.1.50 -p tcp --dport 80 -j ACCEPT
iptables -A INPUT -d 192.168.10.100 -p tcp --dport 80 -j DROP