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                Caldera International, Inc. Security Advisory

Subject: Open UNIX 8.0.0 UnixWare 7.1.1 : X server allows access to any shared memory on the system
Advisory number: CSSA-2002-SCO.14
Issue date: 2002 April 08
Cross reference:
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1. Problem Description

        Any user with local X access can exploit the MIT-SHM extension
        and gain read/write access to any shared memory segment on
        the system.

2. Vulnerable Supported Versions

        System Package
        ----------------------------------------------------------------------
        Open UNIX 8.0.0 xserver
        UnixWare 7.1.1 xserver

3. Solution

        The proper solution is to install the latest packages.

4. Open UNIX 8.0.0

        4.1 Location of Fixed Binaries

        ftp://stage.caldera.com/pub/security/openunix/CSSA-2002-SCO.14

        4.2 Verification

        MD5 (xserver.800a.pkg) = 471bd0d4c43b32d4b04003d78a218c97

        md5 is available for download from
                ftp://stage.caldera.com/pub/security/tools/

        4.3 Installing Fixed Binaries

        Upgrade the affected binaries with the following commands:

        Download xserver.800a.pkg to the /var/spool/pkg directory

        # pkgadd -d /var/spool/pkg/xserver.800a.pkg

5. UnixWare 7.1.1

        5.1 Location of Fixed Binaries

        ftp://stage.caldera.com/pub/security/openunix/CSSA-2002-SCO.14

        5.2 Verification

        MD5 (xserver.711b.pkg) = 545aafcdcfff532ed25dbffea0d06336

        md5 is available for download from
                ftp://stage.caldera.com/pub/security/tools/

        5.3 Installing Fixed Binaries

        Upgrade the affected binaries with the following commands:

        Download xserver.711b.pkg to the /var/spool/pkg directory

        # pkgadd -d /var/spool/pkg/xserver.711b.pkg

6. References

        Specific references for this advisory:
                none

        Caldera UNIX security resources:
                http://stage.caldera.com/support/security/

        Caldera OpenLinux security resources:
                http://www.caldera.com/support/security/index.html

        This security fix closes Caldera incidents sr860994, fz520243
        and erg711973.

7. Disclaimer

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

8. Acknowledgements

        Roberto Zunino discovered and researched this vulnerability.

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