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x86_64 Kernel Exploit

Discussion in 'Security' started by hermit, Sep 18, 2010.

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  1. hermit

    hermit Active Member

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    #1 hermit, Sep 18, 2010
  2. xuser

    xuser Member

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    #2 xuser, Sep 19, 2010
  3. GaryT

    GaryT Well-Known Member

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    Ahum,

    Not even Centos have released anything yet.

    I'm 64bit based and have already applied the patch. This is a tempory must as the "script kiddies" are running wild on this.
     
    #3 GaryT, Sep 19, 2010
  4. cPanelNick

    cPanelNick Administrator Staff Member

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    *** This only affects x86_64 machines. Please ignore this message if you are running a i386/32-bit only machine ***

    *** The below is a temporary workaround for the recent local root security hole in the Linux kernel. This workaround will adversely affect some systems. A partial list of this adverse reactions is listed below. Please think carefully, and seek the advise of an expert if you are unsure if you should apply this workaround. As soon is it becomes available and deemed stable for use, you should get an updated kernel from your Linux kernel vendor. ***

    This "patch"
    Code:
    echo ':32bits:M:0:\x7fELF\x01::/bin/echo:' > /proc/sys/fs/binfmt_misc/register
    will break anything that requires 32-bit compatibility mode. cPanel does distribute true 64 bit binaries. *In theory* most things should be fine.


    So far we have found that most things work just fine (be sure to apply the attached patch before doing this to avoid problems on the next update):

    - it *may* break php when mySQL versions are updated (easyapache should fix this)
    - courier and mysql get installed from source instead of binary (patch attached -- apply in /scripts with
    Code:
    patch -p0 < courierup-mysqlup-32bitdisabled.patch.txt
    -- this will be published in the next EDGE)
    - frontpage (if you still have it) breaks.
    - third party 32bit only apache modules may break.

    There are probably some more things that have not been found yet.
     

    Attached Files:

    #4 cPanelNick, Sep 19, 2010
  5. sneader

    sneader Well-Known Member

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    FrontPage

    Like it or not, we still have a LOT of people that use FrontPage extensions to publish.

    I'd be interested in any workarounds that would allow us to patch for this exploit and still support FrontPage extensions/publishing.

    - Scott
     
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    #5 sneader, Sep 20, 2010
  6. z00dax

    z00dax Registered Verifed Vendor

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    Tracking this issue: CentOS

    We are tracking this issue within CentOS at : 0004518: CVE-2010-3081 - CentOS Bug Tracker

    Also, its important that people realise the code does not need to be built locally, it can be injected and deployed over a remote hole in an existing application installed on your machine ( like WHM itself or anything contained within WHM or apps the users deploy ).

    --
    Karanbir Singh <http://www.karan.org/>
     
    #6 z00dax, Sep 20, 2010
  7. vanessa

    vanessa Well-Known Member PartnerNOC

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    Hey people,

    If you subscribe to ksplice, they already have a fix available for a reboot-less upgrade. Otherwise, there are patches available, if disabling 32-bit binaries is not an option for you.

    Please see:

    Nasty Kernel Exploit in the Wild :: The cPanel Admin
     
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    #7 vanessa, Sep 20, 2010
  8. mtbwacko

    mtbwacko Well-Known Member

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    Ksplice Question

    Well, I attempted to install the Ksplice system but get an error with CENTOS 5.5 x86_64:

    error: Failed dependencies:
    rpmlib(FileDigests) <= 4.6.0-1 is needed by ksplice-uptrack-release-1-3.noarch
    rpmlib(PayloadIsXz) <= 5.2-1 is needed by ksplice-uptrack-release-1-3.noarch

    I've searched and searched and can't find these anywhere, but I did find a lot of forum posts from others with the same problem. Does anyone have a solution for this?
     
    #8 mtbwacko, Sep 20, 2010
  9. hekri

    hekri Well-Known Member

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    I installed Ksplice on 6 servers and apply patch :)
     
    #9 hekri, Sep 20, 2010
  10. xuser

    xuser Member

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    Did you first checked if your system is not compromised?
     
    #10 xuser, Sep 20, 2010
  11. hekri

    hekri Well-Known Member

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    #11 hekri, Sep 20, 2010
  12. rligg

    rligg Well-Known Member

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    Where are the patches that keep 32bit intact?
     
    #12 rligg, Sep 20, 2010
  13. mtbwacko

    mtbwacko Well-Known Member

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    I also checked to make sure the server was clean and it was, but I still can't install Ksplice due to:

    error: Failed dependencies:
    rpmlib(FileDigests) <= 4.6.0-1 is needed by ksplice-uptrack-release-1-3.noarch
    rpmlib(PayloadIsXz) <= 5.2-1 is needed by ksplice-uptrack-release-1-3.noarch

    I have an email in to Ksplice but they are probably overwhelmed right now with orders and trial downloads. I just hope I can figure this out before the server is hit.
     
    #13 mtbwacko, Sep 20, 2010
  14. servermanaged

    servermanaged Registered

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    Thanks for sharing.
     
    #14 servermanaged, Sep 20, 2010
  15. rligg

    rligg Well-Known Member

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    Have you found a solution for this?
     
    #15 rligg, Sep 20, 2010
  16. Valuehosted

    Valuehosted Well-Known Member

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    Will installing and running ksplice interfere or cause issues with cPanel?

    I assume not as you are sort of promoting it; just making sure. :)

    Kind Regards,
    Tony
     
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    #16 Valuehosted, Sep 20, 2010
  17. onlysim

    onlysim Registered

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    What if disable upcp

    Hello,

    Will it be effective if we temporary disable auto update cpanel and apply patch to disable 32bits binaries till official fix released from RH for Centos ?
     
    #17 onlysim, Sep 20, 2010
  18. jenlepp

    jenlepp Well-Known Member

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    I applied this patch, and ever since then, I have had massive problems with MySQL on the servers with crashing, problems restarting, MySQL errors. You name it, I've seen it.

    Does anyone know how to undo this patch? I've been looking, I have my DC's admins looking, and we're all baffled at what we're seeing.
     
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    #18 jenlepp, Sep 20, 2010
  19. Infopro

    Infopro cPanel Sr. Product Evangelist Staff Member

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    I would think your OS vender will be providing a path forward on this soon enough. Today, the next few days? Not sure. But I would also think you could ask your users not to use frontpage (or let them try to and then tell them when they put in a ticket it's been disabled temporarily) until that fix is available from your vendor. Just thinking out loud here I suppose...

    That (disabling updates) will have no effect on this I don't think.

    If you're having a problem with this, I'm sure cPanel wants to know about it. I suggest a ticket be put in and link them to this thread in the ticket.
     
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    #19 Infopro, Sep 20, 2010
  20. brulinux

    brulinux Registered

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    #20 brulinux, Sep 20, 2010
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