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            Caldera International, Inc. Security Advisory

Subject: Open UNIX, UnixWare 7: timed does not enforce nulls
Advisory number: CSSA-2001-SCO.39
Issue date: 2001 December 10
Cross reference:
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1. Problem Description
        
        The timed program does not enforce null-termination of strings
        in certain situations. It is possible that this could be used
        by a malicious user to perform a remote denial-of-service
        attack.

2. Vulnerable Versions

        Operating System Version Affected Files
        ------------------------------------------------------------------
        UnixWare 7 All /usr/sbin/in.timed
        Open UNIX 8.0.0 /usr/sbin/in.timed

3. Workaround

        If the in.timed service is not needed, it may be disabled.

4. UnixWare 7, Open UNIX 8

  4.1 Location of Fixed Binaries

        ftp://stage.caldera.com/pub/security/openunix/CSSA-2001-SCO.39/

  4.2 Verification

        md5 checksums:
        
        87c68b618f4317dd92460aaa49e6a522 erg711890.Z

        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:

        # uncompress /tmp/erg711890.Z
        # pkgadd -d /tmp/erg711890

5. References

        http://xforce.iss.net/static/6228.php
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2001-0388

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

        This advisory addresses Caldera Security internal incidents
        sr855196, fz519311, erg711890.

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.

7. Acknowledgements

        This vulnerability was discovered and researched by David A.
        Holland <dhollandwww.linux.org.uk>.
     

         
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