[8lgm]-Advisory-10.UNIX.SCO-at.10-Feb-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>

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                   [8lgm]-Advisory-10.UNIX.SCO-at.10-Feb-1992


PROGRAM:

        at(1)

VERSION:

        SCO UNIX 3.2v4.2

DESCRIPTION:

        at(1) can be used to execute arbitrary commands as group cron.

IMPACT:

        Any user with access to at(1) can become root.

REPEAT BY:

        Exploit details will not be made available, until a patch is
        provided.

FIX:

        Obtain a patch from SCO.

WORKAROUND:

        Deny access to at(1) for normal users (see man page for details.)

DISCUSSION:

        at(1) was originally designed to run setuid root.  SCOs version of
        at runs setgid cron, but still handles privileges as if running
        euid 0.

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