home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!mcsun!uknet!warwick!nott-cs!lut.ac.uk!
- From: jon_care@hicom.lut.ac.uk
- Newsgroups: comp.security.misc
- Subject: Re: root-owned world-writable files
- Message-ID: <1992Jul23.011952.26697@lut.ac.uk>
- Date: 23 Jul 92 01:19:52 GMT
- References: <62524@cup.portal.com> <1992Jul21.201056.662@newshost.lanl.gov> <14htt0INNiep@hilbert.math.ksu.edu>,<1992Jul22.134745.17309@newshost.lanl.gov>
- Sender: @lut.ac.uk
- Reply-To: jon_care@hicom.lut.ac.uk
- Organization: Hicom Sevices
- Lines: 29
- Nntp-Posting-Host: hicom.lut.ac.uk
-
- In article <1992Jul22.134745.17309@newshost.lanl.gov>, jfowler@beta.lanl.gov (John C. Fowler) writes:
- >In article <14htt0INNiep@hilbert.math.ksu.edu> tar@math.ksu.edu (Tim Ramsey) writes:
- >>How do you get a complete list of files that are trusted by root, or by
- >>programs that root trusts (that is, are setuid root)?
- >
- >To find out if a file is trusted, go to the man directories and grep the
- >filename on everything, then read the associated man pages where the filename
- >turned up (important files usually have their own man pages as well).
- >
- >To find setuid root files, use the "find" command.
- >
- >>Much easier to simply not have world-writable files owned by root.
- >
- >Agreed. Much easier to simply not have world-writable files at all, unless
- >you can come up with a real reason for needing them. With UNIX supporting
- >setuid and setgid programs, it's fairly easy to work around these days.
- >
- >But I still contend that there's nothing "special" about root owning a
- >world-writable file that would allow a user to exploit it over anyone else
- >owning the same file, other than getting around quotas.
- An exception occurs to me in the case of /etc/utmp under SunOS 4.1.1 - the mode
- this is set to by default is 666, hence it is world writeable.
- If you reedit this with a simple C Program, you can make yourself invisible to
- who commands etc. and also can evade certain accounting programs.
-
- >
- >--
- >John C. Fowler, jfowler@lanl.gov
- Jon Care, jonc@sc.plym.ac.uk.
-