CVE-2025-29266 in Unraid
Summary
by MITRE • 03/31/2025
Unraid 7.0.0 before 7.0.1 allows remote users to access the Unraid WebGUI and web console as root without authentication if a container is running in Host networking mode with Use Tailscale enabled.
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Analysis
by VulDB Data Team • 03/31/2025
This vulnerability exists in Unraid 7.0.0 prior to version 7.0.1 and represents a critical authentication bypass flaw that allows remote attackers to gain administrative access to the Unraid WebGUI and web console with root privileges. The vulnerability specifically manifests when a container is configured to use host networking mode in conjunction with the Tailscale networking feature, creating an unexpected security pathway that circumvents the normal authentication mechanisms. The flaw stems from improper access control implementation within the Unraid web interface, where the system fails to properly validate authentication credentials when containers operate in host networking mode with Tailscale enabled.
The technical exploitation of this vulnerability occurs through the interaction between Unraid's networking stack and Tailscale's tunneling capabilities. When a container runs in host networking mode, it shares the host's network namespace directly, bypassing normal network isolation mechanisms. The combination with Tailscale's network routing creates a scenario where network traffic originating from Tailscale peers can be incorrectly interpreted as authenticated administrative access. This represents a classic case of improper access control where the system does not adequately verify the identity and authorization status of users attempting to access administrative interfaces. The vulnerability aligns with CWE-285, which addresses improper authorization in software systems, and demonstrates how network configuration parameters can create unexpected access vectors.
The operational impact of this vulnerability is severe as it provides attackers with complete administrative control over the Unraid system, including the ability to modify system configurations, access all user data, install malicious software, and potentially compromise the entire network infrastructure. Remote attackers can exploit this vulnerability without requiring any prior authentication credentials, making it particularly dangerous in environments where Unraid systems are exposed to the internet. The attack surface expands significantly when considering that Tailscale is commonly used for remote access and network management, making this vulnerability particularly relevant for organizations relying on remote administration capabilities. This flaw directly impacts the principle of least privilege and can lead to complete system compromise, as demonstrated by ATT&CK technique T1078 which covers valid accounts usage for persistence and privilege escalation.
Organizations should immediately update to Unraid version 7.0.1 or later to remediate this vulnerability, as no effective workarounds exist without modifying the underlying system configuration. The recommended mitigation strategy involves disabling the combination of host networking mode with Tailscale for containers that require administrative access, or implementing additional network segmentation measures to isolate critical systems. Security teams should monitor for any unauthorized access attempts and review system logs for evidence of exploitation. Network administrators should also consider implementing firewall rules that restrict direct access to the Unraid web interface from untrusted networks, while ensuring that legitimate Tailscale connections are properly authenticated and authorized. The vulnerability highlights the importance of comprehensive security testing for complex networking configurations and demonstrates how seemingly innocuous feature combinations can create dangerous security implications in modern containerized environments.