Article View: comp.security.misc
Article #144Re: root-owned world-writable files
From: Mark J. Sienkiewicz
Date: Tue, 21 Jul 1992 22:02
Date: Tue, 21 Jul 1992 22:02
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In article <62524@cup.portal.com> VESOFT@cup.portal.com (Michael D Hensley) writes: >COPS doesn't seem to report ALL root-owned world-writable files. > >Agree/disagree/discussion: Any root-owned world-writable file should be >considered a potential security loophole. There is a good argument for both sides: Disagree - It is only a security hole if it is a program that somebody (root or otherwise) will run or if it contains data that you trust for system security. If I make /tmp/junk in single user mode and then leave it there world writeable, it is only a hole if it is also readable and contains data you don't want to get out. Agree - _Any_ world writeable file is a de-facto security hole because any random user can change it. For example, /users/fred/.login is a security hole if it is world writeable. /users/fred/phone_numbers is also a form of security hole, since by writing to it, I could probably cause Fred to make telephone calls to the wrong people. btw.. beware of things that are supposed to be world writeable: e.g. on many machines, /usr/dict/spellhist is world writeable. (It collects lists of words that people spell wrong. It has no special security because you don't really _care_ if it gets trashed. All it is good for is identifying words that _might_ belong in the dictionary. This in itself could be a security hole, if you have people spell-checking documents that contain sensitive information.)
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Newsgroups: comp.security.misc Path: arc1-ca.pugleaf.net!sparky!uunet!haven.umd.edu!wam.umd.edu!ignatz From: ignatz@wam.umd.edu (Mark J. Sienkiewicz) Subject: Re: root-owned world-writable files Message-ID: <1992Jul21.220232.14105@wam.umd.edu> Sender: usenet@wam.umd.edu (USENET News system) Nntp-Posting-Host: rac2.wam.umd.edu Organization: University of Maryland, College Park References: <62524@cup.portal.com> Date: Tue, 21 Jul 1992 22:02:32 GMT Lines: 28