CVE-2025-30199

Executive Summary

CVE-2025-30199 exposes a critical firmware validation flaw in ECOVACS vacuum robot base stations. The base stations accept over-the-air (OTA) firmware updates without cryptographic verification, allowing an attacker within radio range to push malicious firmware. This can lead to full compromise of the base station, enabling lateral movement to the robot, data exfiltration, or use as a pivot point in a home network. The vulnerability is unpatched, and no public exploit code exists, but the attack vector is straightforward for an adversary with physical proximity.

CVSS Breakdown & Threat Level

• CVSS Score: 7.2 (High)
• Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
• Attack Vector (AV): Adjacent Network – attacker must be within wireless range of the base station.
• Attack Complexity (AC): Low – no special conditions required.
• Privileges Required (PR): None – no authentication needed.
• User Interaction (UI): None – no user action required.
• Scope (S): Unchanged – exploitation does not cross trust boundaries.
• Confidentiality (C): High – attacker can read all data on the base station.
• Integrity (I): High – attacker can modify firmware and settings.
• Availability (A): High – attacker can brick the device or disrupt operations.

Threat Level: High. The lack of patch and low attack complexity make this a prime target for IoT botnets and targeted home network intrusions.

Deep Dive & Mechanics

The vulnerability lies in the firmware update mechanism of ECOVACS base stations. The base station communicates with the robot via an insecure wireless protocol (likely a proprietary 2.4 GHz link). When the robot sends a firmware update request, the base station does not verify the digital signature or hash of the firmware image. An attacker can:

1. Sniff the communication between robot and base station to understand the update protocol.
2. Craft a malicious firmware image that includes a backdoor or modified behavior.
3. Inject the malicious update by spoofing the robot’s identity or by sending a forged update request.

Once the base station accepts the malicious firmware, the attacker gains persistent control. The base station can then be used to attack the robot, exfiltrate cleaning maps, or pivot to other devices on the local network.

Vulnerable vs. Patched Code

Since no patch is available, we can only describe the vulnerable behavior:

Vulnerable (current):

# Pseudo-code of vulnerable update handler
def handle_firmware_update(firmware_data):
    # No signature or hash verification
    write_firmware_to_flash(firmware_data)
    reboot()

Patched (expected):

# Pseudo-code of patched update handler
def handle_firmware_update(firmware_data):
    if not verify_signature(firmware_data, trusted_public_key):
        return "Invalid firmware"
    if not verify_hash(firmware_data, expected_hash):
        return "Corrupted firmware"
    write_firmware_to_flash(firmware_data)
    reboot()

The patch would require the base station to validate a cryptographic signature and/or a checksum before writing the firmware.

Exploitation & Lab Setup

Red Team (Offensive)

Lab Setup:

• ECOVACS base station (e.g., model CH1918) and robot (e.g., DEEBOT N8+)
• Software-defined radio (SDR) like HackRF One or RTL-SDR
• Laptop with GNU Radio and custom firmware builder

Steps:

1. Reconnaissance: Use SDR to capture the wireless protocol between robot and base station. Identify the firmware update command and data format.
2. Firmware Extraction: Obtain a legitimate firmware update from the ECOVACS app or website. Reverse-engineer the binary to understand its structure.
3. Malicious Firmware Creation: Modify the firmware to include a reverse shell or a backdoor. For example, add a script that connects to a C2 server.
4. Injection: Use the SDR to transmit the malicious firmware update to the base station, mimicking the robot’s communication pattern.
5. Post-Exploitation: Once the base station reboots with the malicious firmware, connect to the backdoor and gain shell access.

Example command to send malicious update (conceptual):

# Using a custom tool to send firmware over the air
./ecovacs_exploit --target-mac AA:BB:CC:DD:EE:FF --firmware malicious.bin

Blue Team (Defensive)

Detection:

• Monitor for unexpected firmware update requests on the wireless channel.
• Use an SDR to detect anomalous packets that do not match the expected protocol.
• Implement network segmentation: isolate IoT devices on a separate VLAN.

Mitigation:

• Disable automatic firmware updates if possible.
• Use a firewall to block outbound connections from the base station to unknown IPs.
• Monitor for base station reboots or unusual behavior (e.g., constant LED blinking).

Indicators of Compromise (IOCs)

• Network: Unusual wireless packets with firmware update headers from unknown MAC addresses.
• File: Modified firmware binary with unexpected code sections or embedded scripts.
• Behavior: Base station rebooting unexpectedly, connecting to unknown IPs on port 4444 (common reverse shell port).
• Log: Base station logs showing "firmware update received" without prior user action.

Example IOC (YARA rule for malicious firmware):

rule Malicious_Ecovacs_Firmware {
    meta:
        description = "Detects modified ECOVACS firmware with embedded backdoor"
        author = "Valters IT"
        date = "2025-04-01"
    strings:
        $backdoor = "/bin/sh -i >& /dev/tcp/" ascii wide
        $c2_ip = { 0A 00 00 01 } // 10.0.0.1 in hex
    condition:
        $backdoor or $c2_ip
}

Detection Engineering

YARA Rule

rule CVE_2025_30199_Firmware_Validation {
    meta:
        description = "Detects missing firmware signature validation in ECOVACS base station firmware"
        author = "Valters IT"
        reference = "CVE-2025-30199"
    strings:
        $no_verify = "write_firmware_to_flash" ascii wide nocase
        $no_hash = "verify_hash" ascii wide nocase
    condition:
        $no_verify and not $no_hash
}

Sigma Rule

title: Ecovacs Base Station Unauthorized Firmware Update
id: 8a9b7c6d-5e4f-3a2b-1c0d-9e8f7a6b5c4d
status: experimental
description: Detects network traffic indicative of a malicious firmware update to an ECOVACS base station
author: Valters IT
logsource:
    category: network_connection
    product: suricata
detection:
    selection:
        dest_port: 4444
        event_type: alert
    condition: selection
falsepositives:
    - Legitimate firmware updates from ECOVACS servers
level: high

Suricata Rule

alert tcp $HOME_NET any -> $EXTERNAL_NET 4444 (msg:"CVE-2025-30199 - Ecovacs Base Station Reverse Shell"; flow:to_server,established; content:"/bin/sh"; nocase; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Disable automatic firmware updates on the base station via the ECOVACS app.
2. Isolate the base station on a separate VLAN with no internet access.
3. Monitor for unusual wireless activity using an SDR or network analyzer.

Long-Term Fix:

• ECOVACS must release a firmware update that implements cryptographic signature verification for all OTA updates.
• Users should apply the patch as soon as it becomes available.

Workaround:

• If the base station supports it, use a wired Ethernet connection instead of wireless for updates.
• Block outbound connections from the base station to unknown IPs at the firewall.

Valters IT
Senior DevSecOps & Cyber Threat Intelligence Expert