Security Update: [CSSA-2003-019.0] OpenLinux: tcp SYN with FIN packets are not discarded

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                        SCO Security Advisory

Subject:                OpenLinux: tcp SYN with FIN packets are not discarded
Advisory number:        CSSA-2003-019.0
Issue date:             2003 May 5
Cross reference:
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1. Problem Description

        Allowing TCP packets with both the SYN and FIN bits set
        significantly improve an attacker's chances of circumventing
        a firewall.


2. Vulnerable Supported Versions

        System                          Package
        ----------------------------------------------------------------------

        OpenLinux 3.1.1 Server          prior to tcp_sec-1.0-1.i386.rpm
        OpenLinux 3.1.1 Workstation     prior to tcp_sec-1.0-1.i386.rpm


3. Solution

        The proper solution is to install the latest packages. Many
        customers find it easier to use the Caldera System Updater, called
        cupdate (or kcupdate under the KDE environment), to update these
        packages rather than downloading and installing them by hand.


4. OpenLinux 3.1.1 Server

        4.1 Package Location

        ftp://ftp.sco.com/pub/updates/OpenLinux/3.1.1/Server/CSSA-2003-019.0/RPMS

        4.2 Packages

        57270040e72d49ac888b9967cc86cac8        tcp_sec-1.0-1.i386.rpm

        4.3 Installation

        - rpm -ivh tcp_sec-1.0-1.i386.rpm
        - reboot the machine

        4.4 Source Package Location

        ftp://ftp.sco.com/pub/updates/OpenLinux/3.1.1/Server/CSSA-2003-019.0/SRPMS

        4.5 Source Packages

        acee43450be1a90b11bfc6049e9b788e        tcp_sec-1.0-1.src.rpm


5. OpenLinux 3.1.1 Workstation

        5.1 Package Location

        ftp://ftp.sco.com/pub/updates/OpenLinux/3.1.1/Workstation/CSSA-2003-019.0/RPMS

        5.2 Packages

        24b4643542d6c0fbd6b8dc18462fb99e        tcp_sec-1.0-1.i386.rpm

        5.3 Installation

        - rpm -ivh tcp_sec-1.0-1.i386.rpm
        - reboot the machine

        5.4 Source Package Location

        ftp://ftp.sco.com/pub/updates/OpenLinux/3.1.1/Workstation/CSSA-2003-019.0/SRPMS

        5.5 Source Packages

        a20384e0690e90a6d0528dd3bb4b9843        tcp_sec-1.0-1.src.rpm

8. References

        Specific references for this advisory:

                http://www.securityfocus.com/archive/1/296122/2002-10-19/2002-10-25/2
                http://www.kb.cert.org/vuls/id/464113

        SCO security resources:

                http://www.sco.com/support/security/index.html

        This security fix closes SCO incidents sr876423, fz527624,
        erg712275.


9. Disclaimer

        SCO 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 SCO products.


10. Acknowledgements

        Paul Starzetz discovered and researched this vulnerability.

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