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            Caldera International, Inc. Security Advisory

Subject: Open UNIX, UnixWare 7: xlock buffer overflow
Advisory number: CSSA-2001-SCO.34
Issue date: 2001 November 16
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1. Problem Description
        
        The /usr/bin/X11/xlock program contains a potential security
        problem via a buffer overflow. This could be used by an
        unauthorized user to gain privilege.

2. Vulnerable Versions

        Operating System Version Affected Files
        ------------------------------------------------------------------
        UnixWare 7 7.1.0, 7.1.1 /usr/bin/X11/xlock
        Open UNIX 8.0.0 /usr/bin/X11/xlock

3. Workaround

        Remove the setuid bit from the binary:

                chmod -s /usr/bin/X11/xlock

4. UnixWare 7, Open UNIX 8

  4.1 Location of Fixed Binaries

        ftp://stage.caldera.com/pub/security/openunix/CSSA-2001-SCO.34/

  4.2 Verification

        md5 checksums:
        
        7220c59693f2db6312173259a37a6ba5 xcontrib_801.pkg

        md5 is available for download from

                ftp://stage.caldera.com/pub/security/tools/

  4.3 Installing Fixed Binaries

        Download the xcontrib_801.pkg file to /usr/tmp.

        This package is an upgrade install to UnixWare 7 xcontrib
        package version 7.1.1 and Caldera OpenUNIX 8 version 8.0.0.
        This version 8.0.1 contains all the components released with
        any previous updates plus the bug fixes mentioned above. To
        verify the currently installed version of this package:

                # pkginfo -x xcontrib

        It is not necessary, nor recommended, to remove previous
        versions of this package from the system before installing
        this updated version.

        To install this package, you may use the SCOadmin Application
        Installer from the desktop, or as a root login with pkgadd:

        # pkgadd -d /usr/tmp/xcontrib_801.pkg

        NOTE: Do not use /tmp as the download directory. It could fail
        with a 'No space' message during pkgadd.

        The message

                WARNING: UnixWare Update 7.x.x should be reapplied

        can be safely ignored. There are no files in the Update which
        patch this package.

5. References

        This and other advisories are located at
                http://stage.caldera.com/support/security

        This advisory addresses Caldera Security internal incidents
        sr848020, fz518827, erg711744.

6. Disclaimer

        Caldera International, Inc. is not responsible for the misuse
        of any of the information we provide on our website and/or
        through our security advisories. Our advisories are a service
        to our customers intended to promote secure installation and
        use of Caldera International products.

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