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            Caldera International, Inc. Security Advisory

Subject: OpenServer 5.0.5: nmap port scanner can kill inetd
Advisory number: CSSA-2001-SCO.33
Issue date: 2001 November 15
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1. Problem Description
        
        The "nmap" port scanner can kill inetd if invoked with the -P0
        flag.

2. Vulnerable Versions

        Operating System Version Affected Files
        ------------------------------------------------------------------
        OpenServer 5.0.5 /etc/inetd

3. Workaround

        This problem is fixed in the OpenServer 5.0.6 product. If an
        OpenServer 5.0.6 machine is available, the inetd binary from
        it can be used on the OpenServer 5.0.5 machine.

4. OpenServer

  4.1 Location of Fixed Binaries

        ftp://stage.caldera.com/pub/security/openserver/CSSA-2001-SCO.33/

  4.2 Verification

        md5 checksums:

        43a9a473c59b6af8314504701f331a86 inetd.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:

        Download inetd.Z into the /tmp directory
        # cd /tmp
        # uncompress inetd.Z
        # mv /etc/inetd /etc/inetd-
        # chmod 0 /etc/inetd-
        # mv /tmp/inetd /etc
        # chown bin:bin /etc/inetd
        # chmod 711 /etc/inetd

5. References

        http://lists.insecure.org/nmap-hackers/2000/Jan-Mar/0073.html

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

        This advisory addresses Caldera Security internal incidents
        sr853144, SCO-236-1787, and erg711859.

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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