| Package | Affected versions | Patched versions |
|---|---|---|
| tailscale.com | < 1.32.3 | 1.32.3 |
| tailscale | < 1.32.3 | 1.32.3 |
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)
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.
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.
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.
We would like to thank Emily Trau and Jamie McClymont (CyberCX) for reporting this issue. Further detail is available in their blog post.
If you have any questions or comments about this advisory, contact Tailscale support.
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