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RichFelker's profile
Rich Felker
Rich Felker
Rich Felker
@RichFelker

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Rich Felker

@RichFelker

Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.

musl-libc.org
Joined March 2014

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    Rich Felker‏ @RichFelker Apr 6

    Linux networking tip: if your box is on a fixed network, always set net.ipv6.conf.forwarding=1. "Forwarding" is a misnomer; it means "is not a dynamic host" and is needed to suppress ability for malicious peers on lan to reconfigure your interfaces & routing.

    8:57 AM - 6 Apr 2018
    • 13 Likes
    • Igmar Palsenberg Rob Dux Jin Kim Arvid E. Picciani Marc Berndtgen Andrew Ayer Ben Zanin Charles Forsyth
    3 replies 0 retweets 13 likes
      1. New conversation
      2. Arvid E. Picciani‏ @arvidep Apr 6
        Replying to @RichFelker

        Isn't announcing additional non-default routes part of the whole idea of v6? Maybe I'm confusing something here.

        1 reply 0 retweets 0 likes
      3. Rich Felker‏ @RichFelker Apr 6
        Replying to @arvidep

        It's one feature you may or may not want, but "unauthenticated peer can reconfigure your network interfaces" is generally a security misdesign, and it's certainly not "the whole idea of v6".

        1 reply 0 retweets 0 likes
      4. Rich Felker‏ @RichFelker Apr 6
        Replying to @RichFelker @arvidep

        If you want a tweet-sized version of "the whole idea of IPv6", it's just "4 billion addresses is nowhere near enough". Everything beyond that is basically "hey while we're at it we could add this feature too..."

        0 replies 0 retweets 1 like
      5. End of conversation
      1. New conversation
      2. mabraFoo‏ @mabraFoo Apr 6
        Replying to @RichFelker

        The differences in how ipv6 works is not well understood by many, including me. Can you provide a source link for this? This link seems to say the opposite.https://www.tachyondynamics.com/ipv6-security-server-operating-systems/ …

        1 reply 0 retweets 0 likes
      3. Rich Felker‏ @RichFelker Apr 6
        Replying to @mabraFoo

        Read kernel's Documentation/networking/ip-sysctl.txt. You can turn off accept_ra etc. manually but forwarding fixes all the defaults from what I can tell.

        0 replies 0 retweets 1 like
      4. End of conversation
      1. New conversation
      2. @landley‏ @landley Apr 6
        Replying to @RichFelker

        If your box is on a fixed ipv4 network you need to tweak an ipv6 setting?

        1 reply 0 retweets 0 likes
      3. Josiah Worcester‏ @pikhq Apr 6
        Replying to @landley @RichFelker

        IPv6 has weird autoconfig stuff. Without that setting, a malicious host on the network could pretend to be an autoconfig router and get you an IPv6 network ANYWAYS. So it's perhaps more important there.

        1 reply 0 retweets 0 likes
      4. @landley‏ @landley Apr 6
        Replying to @pikhq @RichFelker

        Is this a bigger exploit than somebody pretending to be a dhcp server?

        1 reply 0 retweets 0 likes
      5. Josiah Worcester‏ @pikhq Apr 6
        Replying to @landley @RichFelker

        I'm pretty sure it's more-or-less identical, except with the assumption a DHCP server is running, and that it's something you're less likely to expect.

        2 replies 0 retweets 0 likes
      6. Rich Felker‏ @RichFelker Apr 6
        Replying to @pikhq @landley

        Yes, it's equivalent to the issues of a malicious DHCP server. But that only affects you if you're running a DHCP client; OTOH the kernel runs an IPv6 stateless autoconf client unless you explicitly turn it off via the above.

        0 replies 0 retweets 0 likes
      7. End of conversation

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