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Thread: libc6 flaw worry

  1. #1
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    libc6 flaw worry

    .
    I expressed my concern about the following news item to Klaus K:
    http://www.eweek.com/security/linux-...libc-flaw.html

    His comment on this was the following:
    Me too, since all glibc >= 2.9 versions till today are affected, with
    the glibc on Knoppix being no exception.

    For exploiting the vulnerability, the attacker must own the directly
    queried DNS server (i.e. the users access point, or the ISPs DNS server)
    and send manipulated DNS replies from there, or be able to hijack TCP
    connections, and in most cases, programs will just crash on the
    getaddrinfo() library call, but code injection on the stack may be
    possible. Though an attack isn't really easy, it's a real possibility.

    The easy commandline method (for USB flash disk users) for fixing the
    problem, thanks to debian's quick reaction in the unstable branch, would be:

    sudo apt-get update ; sudo apt-get install -t unstable libc6
    which also updates libc6 dependencies.
    I did this on my Knoppix 7.6.1 LiveUSB, and it updated my libc6 to 2.21.0,
    and didn't take up much space on my reiserfs persistence.

    IMO, it may be wise to make this interim correction, since updating the
    whole 4Gb Knoppix iso might not happen right away.

  2. #2
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    Should read updated to libc6 2.21-9, not 2.21.0.
    Last edited by utu; 02-23-2016 at 01:33 AM.

  3. #3
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    A reminder, in case you are not using 7.7.0.

    Regarding libc6...

    http://www.linux-magazine.com/Issues/2016/187/Ask-Klaus

    You don't need to buy the article, just see the first post here.
    Last edited by utu; 05-13-2016 at 06:07 PM.

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