Re: Group permissions changed

From: Alan McKinnon (alan_at_linuxholdings.co.za)
Date: 09/29/05

  • Next message: Eduardo Tongson: "Re: Group permissions changed" 
    To: focus-linux@securityfocus.com
Date: Thu, 29 Sep 2005 18:31:06 +0200

    On Wednesday, 28 September 2005 20:33, sf_submit@yahoo.com wrote:
    > I posted this before on the security basics, but haven't recieved a
    > response, and it worries me a bit, so I'm sending this to a few
    > other groups in hopes that someone will have an idea about it.
    >
    > ---
    >
    > Fairly recently I noticed my ftp client wouldn't list files in
    > certain directories on my server anymore - so I ssh'd in (it's
    > dedicated), and did a ls -aFl on the files, hoping to see what the
    > problem was - here are a few of the results:
    >
    > -rw-r--r-- 1 larry 503 371 2005-02-25 08:36 head.php
    > -rw-r--r-- 1 larry 48 873 2005-09-09 03:23 foot.php
    >
    > I never set the group ids to 503 or 48, so I checked just to make
    > sure - and no groups with those ids even exist. Is there an
    > exploit/tool that causes this, and should I be worried?
    >
    > I checked the processes running, and everything seems to be OK -
    > same with any processes connecting to the internet.
    >
    > I'd appreciate any comments

    first step is probably to see how many other files don't have valid
    users and groups:

    find . -nouser
    find . -nogroup

    and take it from there 

    -- 
Alan McKinnon
alan at linuxholdings dot co dot za
+27 82, double three seven, one nine three five
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