Executive Summary

[{'type': 'paragraph', 'content': 'CVE-2026-1803 is a critical vulnerability in the Ziroom ZHOME A0101 device, firmware version 1.0.1.0, specifically affecting the Dropbear SSH service component. The vulnerability arises because the Dropbear SSH service is configured with default credentials such as "root/admin" or even a blank password, allowing remote attackers to connect via SSH on a non-standard port (1022) without prior authentication.'}, {'type': 'paragraph', 'content': 'This misconfiguration permits attackers to gain root shell access remotely, enabling them to execute commands with full privileges on the device. The SSH service is enabled by default and configured to allow root login with password authentication, increasing the risk of unauthorized access.'}] [1, 3]

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Impact Analysis

This vulnerability can have severe impacts including unauthorized remote code execution with root privileges, allowing attackers to take full control of the affected device.

• Pre-authentication remote code execution (RCE) enabling attackers to run arbitrary commands.
• Unauthorized configuration changes that could disrupt device operation or security.
• Data exfiltration, leading to potential leakage of sensitive information.
• Ability for attackers to maintain persistent access on the device, making remediation difficult.

The exploit is publicly available, increasing the risk of attacks, although the complexity is considered high and exploitability difficult.

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Detection Guidance

[{'type': 'paragraph', 'content': 'This vulnerability can be detected by scanning for the Dropbear SSH service running on the non-standard port 1022, which is enabled by default on the Ziroom ZHOME A0101 device. Checking for open port 1022 and attempting to connect via SSH using default credentials such as "root/admin" or a blank password can help identify if the device is vulnerable.'}, {'type': 'list_item', 'content': 'Use a network scanning tool like nmap to check if port 1022 is open: nmap -p 1022 <target-ip>'}, {'type': 'list_item', 'content': 'Attempt to SSH into the device on port 1022 with default credentials: ssh root@<target-ip> -p 1022'}, {'type': 'list_item', 'content': "Check the device's /etc/config/dropbear configuration file for settings RootLogin=1, RootPasswordAuth=1, and PasswordAuth=1 if you have local access."}] [1]

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Mitigation Strategies

[{'type': 'paragraph', 'content': "Immediate mitigation steps include disabling the Dropbear SSH service on port 1022 to prevent remote access using default credentials. This can be done by setting dropbear.@dropbear[0].enable='0' in the UCI configuration file. Additionally, changing default passwords and restricting root login via SSH are recommended. If possible, replacing the affected device with a secure alternative is advised since no official vendor patch or response is available."}] [1, 3]

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Compliance Impact

The vulnerability allows remote attackers to gain unauthorized root access through default credentials in the Dropbear SSH service, leading to potential unauthorized configuration changes, data exfiltration, and persistent device compromise.

Such unauthorized access and data breaches can result in non-compliance with common standards and regulations like GDPR and HIPAA, which require strict controls over data confidentiality, integrity, and availability.

Specifically, the compromise of confidentiality, integrity, and availability due to this vulnerability could lead to violations of data protection requirements, exposing organizations to legal and regulatory penalties.

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