Re: Possible system breach due to an improper command
From: Bill Unruh (unruh@string.physics.ubc.ca)
Date: 04/18/03
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From: unruh@string.physics.ubc.ca (Bill Unruh) Date: 18 Apr 2003 16:08:28 GMT
djcameron60616@yahoo.com (stg-delfuego) writes:
]Hello,
]I was wondering if someone can tell me what I may have inadvertantly
]done, and what I should do to correct the matter.
]I have a unix shell from a local isp, and I was doing some unix stuff,
]and decided to make my file more private. I issued a chmod command on
]dot-files (i.e. .plan, .login, etc). The actual command was chmod 460
].*
As stated in anther thread this is a very silly use of chmod. It will
lock you out of your own home directory (no search permission) and will
try to lock the directoy one level up as well. (..)
]Well, the next thing I know I am out of my locked shell and in root,
]with more privelege than i thought. This is on BSD.
I have no idea how this would be, unless youthought that was what had
happened when something else had.(what is the evidence that you were
root?)
If youactually became root, that would mean that the system had been
cracked and someone had inserted a rogue chmod.
]I called the ISP and left two messages with the operator to have the
]sysadmin call me back, and sent a mail to root@the-sip.
]I had logging enabled for my session, so I can tell them exactly what
]I did and how the system responded. I am afraid I may altered system
]binaries.
Well, probably not, but you may well have messed up your own home
directory.
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