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- Path: sparky!uunet!zaphod.mps.ohio-state.edu!swrinde!elroy.jpl.nasa.gov!nntp-server.caltech.edu!SOL1.GPS.CALTECH.EDU!CARL
- From: carl@SOL1.GPS.CALTECH.EDU (Carl J Lydick)
- Newsgroups: comp.os.vms
- Subject: Re: HELP!!! Security problem for gurus.
- Date: 22 Dec 1992 05:19:54 GMT
- Organization: HST Wide Field/Planetary Camera
- Lines: 28
- Distribution: world
- Message-ID: <1h68hqINN9ks@gap.caltech.edu>
- References: <9212211720.AA15326@ucbvax.Berkeley.EDU>
- Reply-To: carl@SOL1.GPS.CALTECH.EDU
- NNTP-Posting-Host: sol1.gps.caltech.edu
-
- In article <9212211720.AA15326@ucbvax.Berkeley.EDU>, simons/G=Colin/I=CB/S=Sewell/O=H.A.Simons.Ltd/OU=CORP@mhs.attmail.com writes:
- > Yup, ACL's won't protect you. Another priv that can get around ACL's
- >is one that is given to operators and special backup accounts so they can read
- >all files on a disk for backup purposes: READALL priv. What most of the people
- >around here didn't know was that this priv also grants you implicit write access
- >to all files!
-
- Yup. READALL is a terribly misnamed priv. IHNSHO, DEC should've called the
- priv BACKUP, since that's what it's for. The priv was introduced (if I
- understaned things correctly) as an alternative to BYPASS for accounts that
- were supposed to be doing BACKUPs. Of course, to do a useful BACKUP of a disk,
- you need to be able to read every file on the disk. Hence the name READALL.
- But wait! There's more! To do a BACKUP/RECORD, you ALSO need to be able to
- modify the file header. Given the way ODS-2 works (if you want details, either
- buy the book or e-mail me for the 1978 description), this pretty much means
- that you've got complete control (C access, in ACL-speak) of the file. That's
- what READALL originally gave you. I understand they took away the control
- access part in one version of VMS, but gave it back again when all the people
- who'd set up their BACKUP procedures counting on the ability to record BACKUP
- dates with just READALL priv complained.
- --------------------------------------------------------------------------------
- Carl J Lydick | INTERnet: CARL@SOL1.GPS.CALTECH.EDU | NSI/HEPnet: SOL1::CARL
-
- Disclaimer: Hey, I understand VAXen and VMS. That's what I get paid for. My
- understanding of astronomy is purely at the amateur level (or below). So
- unless what I'm saying is directly related to VAX/VMS, don't hold me or my
- organization responsible for it. If it IS related to VAX/VMS, you can try to
- hold me responsible for it, but my organization had nothing to do with it.
-