CVE-2022-41924

A vulnerability identified in the Tailscale Windows client allows a malicious website to reconfigure the Tailscale daemon `tailscaled`, which can then be used to remotely execute code. In the Tailscale Windows client, the local API was bound to a local TCP socket, and communicated with the Windows client GUI in cleartext with no Host header verification. This allowed an attacker-controlled website visited by the node to rebind DNS to an attacker-controlled DNS server, and then make local API requests in the client, including changing the coordination server to an attacker-controlled coordination server. An attacker-controlled coordination server can send malicious URL responses to the client, including pushing executables or installing an SMB share. These allow the attacker to remotely execute code on the node. All Windows clients prior to version v.1.32.3 are affected. If you are running Tailscale on Windows, upgrade to v1.32.3 or later to remediate the issue.

A vulnerability identified in the Tailscale Windows client allows a malicious website to reconfigure the Tailscale daemon `tailscaled`, which can then be used to remotely execute code. In the Tailscale Windows client, the local API was bound to a local TCP socket, and communicated with the Windows client GUI in cleartext with no Host header verification. This allowed an attacker-controlled website visited by the node to rebind DNS to an attacker-controlled DNS server, and then make local API requests in the client, including changing the coordination server to an attacker-controlled coordination server. An attacker-controlled coordination server can send malicious URL responses to the client, including pushing executables or installing an SMB share. These allow the attacker to remotely execute code on the node. All Windows clients prior to version v.1.32.3 are affected. If you are running Tailscale on Windows, upgrade to v1.32.3 or later to remediate the issue.

Tailscale Windows daemon is vulnerable to RCE via CSRF in tailscale.com

A vulnerability identified in the Tailscale Windows client allows a malicious website to reconfigure the Tailscale daemon `tailscaled`, which can then be used to remotely execute code. **Affected platforms:** Windows **Patched Tailscale client versions:** v1.32.3 or later, v1.33.257 or later (unstable) ### What happened? In the Tailscale Windows client, the local API was bound to a local TCP socket, and communicated with the Windows client GUI in cleartext with no Host header verification. This allowed an attacker-controlled website visited by the node to rebind DNS to an attacker-controlled DNS server, and then make local API requests in the client, including changing the coordination server to an attacker-controlled coordination server. ### Who is affected? All Windows clients prior to version v.1.32.3 are affected. ### What should I do? If you are running Tailscale on Windows, upgrade to v1.32.3 or later to remediate the issue. ### What is the impact? An attacker-controlled coordination server can send malicious URL responses to the client, including pushing executables or installing an SMB share. These allow the attacker to remotely execute code on the node. Reviewing all logs confirms this vulnerability was not triggered or exploited. ### Credits We would like to thank [Emily Trau](https://github.com/emilytrau) and [Jamie McClymont (CyberCX)](https://twitter.com/JJJollyjim) for reporting this issue. Further detail is available in [their blog post](https://emily.id.au/tailscale). ### References * [TS-2022-004](https://tailscale.com/security-bulletins/#ts-2022-004) * [Researcher blog post](https://emily.id.au/tailscale) ### For more information If you have any questions or comments about this advisory, [contact Tailscale support](https://tailscale.com/contact/support/).

Una vulnerabilidad identificada en el cliente Tailscale de Windows permite que un sitio web malicioso reconfigure el daemon Tailscale "tailscaled", que luego puede usarse para ejecutar código de forma remota. En el cliente Tailscale de Windows, la API local estaba vinculada a un socket TCP local y se comunicaba con la GUI del cliente de Windows en texto plano sin verificación del encabezado del Host. Esto permitió que un sitio web controlado por un atacante visitado por el nodo volviera a vincular DNS a un servidor DNS controlado por un atacante y luego realizar solicitudes de API locales en el cliente, incluido el cambio del servidor de coordinación a un servidor de coordinación controlado por un atacante. Un servidor de coordinación controlado por un atacante puede enviar respuestas URL maliciosas al cliente, incluida la inserción de ejecutables o la instalación de un recurso compartido SMB. Estos permiten al atacante ejecutar código de forma remota en el nodo. Todos los clientes de Windows anteriores a la versión v.1.32.3 se ven afectados. Si está ejecutando Tailscale en Windows, actualice a la versión 1.32.3 o posterior para solucionar el problema.