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Tailscale SSH: Investigation and remediation update

https://tailscale.com/ssh-investigation-update
68•figmert•1h ago

Comments

wslh•55m ago
With the success of Tailscale I would like to be sure that their repositories and scenarios are continuously reviewed. I understand that there is always a next hop in cybersecurity though.
_def•55m ago
I think it's so invasive that they ship this per default. But thats the business model i guess.
femiagbabiaka•52m ago
Do they ship this by default? I thought it had to be enabled: https://tailscale.com/docs/features/tailscale-ssh#configure-...
forbiddenlake•52m ago
How do you mean? You have to run a command to enable tailscale ssh, it isn't on by default.
seemaze•44m ago
I've always had to manually enable this feature. I've never experienced it on by default across multiple platforms and deployments.
LeoPanthera•42m ago
Tailscale SSH is not enabled by default.
6thbit•48m ago

  > Most of the Tailscale SSH issues we've identified concern privilege escalation. In some circumstances, someone already authorized to connect over Tailscale SSH may be able to perform actions beyond the permissions of their configured local user, including potentially gaining elevated privileges.

"Most"? "In some circumstances"? Makes me think that they could also be investigating a full on unauthorized connection issue, or am I reading too much into it?
awildfivreld•29m ago
The underlying writeup can be found at https://tailworm.com/
remus•27m ago
I think they're just writing cautiously because they're midway through the investigation and don't want to give false confidence. Doesn't seem worth reading too much into it until they provide a more thorough write up.
devmor•27m ago
A security researcher colleague of mine was/is exploring an unauthenticated avenue along this line. I don’t have any update, she told me she didn’t feel comfortable exposing information to anyone other than Tailscale staff until she’s confident in what she found or didn’t.
pizzafeelsright•26m ago
Obviously tailscale has some great devs, security is complex.

There is some weaselly language.

In some circumstances default config? with password? this is a condition leading to the next

someone already authorized to connect over Tailscale SSH they have access, but it may be limited or restricted, although scope could be beyond the intended

may be able to perform actions beyond the permissions If there is a full moon and your brother in law's second cousin is wearing a hat, he may be able to use your upstair's thermostat provided you have a second story.

slowin•34m ago
I self-host a tailnet with Headscale and could not be happier: https://headscale.net/stable/
dist-epoch•28m ago
Sure, that doesn't mean it's not vulnerable.

> Organizations using headscale v0.29.5 have no mechanism to disable the forwarding behavior at the center of the finding.

https://techjacksolutions.com/scc-vendor-rollup/tailscale-he...

wrxd•31m ago
I like Tailascale as a product but I decided to move my homelab to plain WireGuard.

I wasn't using any of the additional features, I can get away with exposing a port on my router and I am changing devices rarely.

News like this make me happy I removed a lot of complexity and attack surface

fooqux•29m ago
From the sounds of what info they felt was safe to provide, this wouldn't have impacted you anyway.
giwook•12m ago
Don’t think that refutes their point.
femiagbabiaka•10m ago
> I can get away with exposing a port on my router

using wireguard is awesome, but I wouldn't say deploying and maintaining it lacks complexity exactly. and you didn't get rid of attack surface, you just made it your responsibility ;)

aborsy•24m ago
There are too many features, and lines of code (probably more than OpenVPN). I'm pretty sure there are all kinds of zero days, with this attack surface and feature set.

I use it extensively, and I would rather pay them a fee if they could review thr code.

Another possibility is as lock down mode, disabling fancy and risky features.

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