[8lgm]-Advisory-11.UNIX.sadc.07-Jan-1992

[8lgm () bagpuss demon co uk ([8LGM] Security Team)]

This advisory has been sent to:

        comp.security.unix

        BUGTRAQ                 <bugtraq () fc net>
        CERT/CC                 <cert () cert org>
        SCO                     <security-alert () sco com>

===========================================================================
                [8lgm]-Advisory-11.UNIX.sadc.07-Jan-1992

PROGRAM:

        sadc(1M)        (/usr/lib/sa/sadc)
                        Supplied with SYS V accounting utilities

KNOWN VULNERABLE OS's:

        SCO UNIX 3.2v4.2        (suid root)
        SVR4/i386 4.0.3         (sgid sys)
        A/UX 2.0.1              (sgid sys)

DESCRIPTION:

        sadc(1M) can be used to create files in normally unwritable
        directories.  sadc normally runs egid sys, and therefore
        can be used to create files in group sys writeable directories.

        SCOs sadc runs euid root, and therefore can be used to create
        files anywhere on the filesystem.

IMPACT:

        Any user with access to sadc under SCO can become root.  On 
        other vulnerable systems, users may have improved chances of 
        gaining root access.

REPEAT BY:

        Exploit details will not be made available, until patches have
        been provided.
        
FIX:

        Contact your vendor for a fix.

WORKAROUND:

        In the meantime, limit access to sadc by changing mode on
        /usr/lib/sa.

FEEDBACK AND CONTACT INFORMATION:

        8lgm-bugs () bagpuss demon co uk           (To report security flaws)

        8lgm-request () bagpuss demon co uk        (Mailing list additions -
                                                 processed automatically;
                                                 just send any message)

        8lgm () bagpuss demon co uk                (Everything else)

        System Administrators are encouraged to contact us for any
        other information they may require about the problems described
        in this advisory.

        We welcome reports about which platforms this flaw does or does
        not exist on.

        NB: 8lgm-bugs () bagpuss demon co uk is intended to be used by
        people wishing to report which platforms/OS's the bugs in our
        advisories are present on.  Please do *not* send information on
        other bugs to this address - report them to your vendor and/or
        comp.security.unix instead.

8LGM MAILING LIST:

        Send any message to 8lgm-request () bagpuss demon co uk and the
        address you mail from will automatically be added to the list.

        If you need to subscribe to an address you cannot mail from
        (eg an alias), send mail to 8lgm () bagpuss demon co uk and request
        to be added to the list.  Due to our mail volume, we appreciate
        it if you can use 8lgm-request instead; thus if you need to
        subscribe an alias, please look into using, say sendmail -f,
        if possible.

8LGM FILESERVER:

        All [8LGM] advisories may be obtained via the [8LGM] fileserver.
        For details, 'echo help | mail 8lgm-fileserver () bagpuss demon co uk'
===========================================================================