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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.

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sharing my simple wireguard kill-switch for Linux (lemmings.world)

submitted 6 months ago by xabadak@lemmings.world to c/linux@lemmy.ml

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In light of the recent TunnelVision vulnerability I wanted to share a simple firewall that I wrote for wireguard VPNs.

https://codeberg.org/xabadak/wg-lockdown

If you use a fancy official VPN client from Mullvad, PIA, etc, you won't need this since most clients already have a kill switch built in (also called Lockdown Mode in Mullvad). This is if you use a barebones wireguard VPN like me, or if your VPN client has a poorly-designed kill switch (like NordVPN, more info here).

A firewall should mitigate the vulnerability, though it does create a side-channel that can be exploited in extremely unlikely circumstances, so a better solution would be to use network namespaces (more info here). Unfortunately I'm a noob and I couldn't find any scripts or tools to do it that way.

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[–] delirious_owl@discuss.online 2 points 6 months ago* (last edited 6 months ago) (1 children)

You're still right in 99% of all use cases.

Nobody operates VPNs for privacy in split tunnel. So everyone running Linux that would be concerned about this is unaffected.

[–] xabadak@lemmings.world 1 points 6 months ago (2 children)

I thought TunnelVision applies to all VPN users that don't use firewall / network namespaces

[–] progandy@feddit.de 1 points 6 months ago* (last edited 6 months ago)

A separate routing table that takes precedence over the one modified by DHCP should works as well I think. Oh, and of course you have to use a vpn that forces its own nameserver or set one manually to prevent redirections.

[–] delirious_owl@discuss.online 1 points 6 months ago (1 children)

It doesn't apply to Linux unless you do split tunnel, which no commercial VPN configs use, because it doesn't make sense to

[–] xabadak@lemmings.world 1 points 6 months ago

why is a split tunnel relevant? I thought all VPNs are vulnerable unless they use a firewall like I do, or network namespaces.

At least the way I understand it, a normal VPN redirects your internet traffic to instead go through a virtual network interface, which then encrypts and sends your traffic through the VPN. This attack uses a malicious DHCP server to inject routes into your system, redirecting traffic to the attacker instead of towards the virtual network interface.