OpenServer 5.0.6 OpenServer 5.0.7 : A vulnerability in TCP

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Date: 03/01/05

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    To: security-announce@list.sco.com, bugtraq@securityfocus.com, full-disclosure@lists.netsys.com
    Date: Mon, 28 Feb 2005 16:07:03 -0800
    
    

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    ______________________________________________________________________________

                            SCO Security Advisory

    Subject: OpenServer 5.0.6 OpenServer 5.0.7 : A vulnerability in TCP
    Advisory number: SCOSA-2005.3
    Issue date: 2005 February 28
    Cross reference: sr890248 fz529385 erg712599 CAN-2004-0230
    ______________________________________________________________________________

    1. Problem Description

            TCP, when using a large Window Size, makes it easier for
            remote attackers to guess sequence numbers and cause a
            denial of service (connection loss) to persistent TCP
            connections by repeatedly injecting a TCP RST packet,
            especially in protocols that use long-lived connections,
            such as BGP.

            Paul Watson performed a statistical analysis of this attack
            when the ISN is not known and has pointed out that such an
            attack could be viable when specifically taking into account
            the TCP Window size. He has also created a proof-of-concept
            tool demonstrating the practicality of the attack.

            The National Infrastructure Security Co-Ordination Center (NISCC)
            has published an advisory summarizing Paul Watson's analysis in
            "NISCC Vulnerability Advisory 236929."

            The Common Vulnerabilities and Exposures project (cve.mitre.org)
            has assigned the name CAN-2004-0230 to this issue.

    2. Vulnerable Supported Versions

            System Binaries
            ----------------------------------------------------------------------
            OpenServer 5.0.6 TCP driver
            OpenServer 5.0.7 TCP driver

    3. Solution

            The proper solution is to install the latest packages.

    4. OpenServer 5.0.7

            4.1 Location of Fixed Binaries

            ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2005.3

            4.2 Verification

            MD5 (VOL.000.000) = 0f3182ee23d7bd90359d7ac0973dd44e

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

            4.3 Installing Fixed Binaries

            Upgrade the affected binaries with the following sequence:

            1) Download the VOL* files to the /tmp directory

            2) Run the custom command, specify an install from media
            images, and specify the /tmp directory as the location of
            the images.

    5. OpenServer 5.0.6

            5.1 Location of Fixed Binaries

            ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2005.3

            5.2 Verification

            MD5 (VOL.000.000) = 0f3182ee23d7bd90359d7ac0973dd44e

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

            5.3 Installing Fixed Binaries

            Upgrade the affected binaries with the following sequence:

            1) Download the VOL* files to the /tmp directory

            2) Run the custom command, specify an install from media
            images, and specify the /tmp directory as the location of
            the images.

    6. References

            Specific references for this advisory:
                    http://www.uniras.gov.uk/vuls/2004/236929/index.htm
                    http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0230
                    http://www.us-cert.gov/cas/techalerts/TA04-111A.html

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

            SCO security advisories via email
                    http://www.sco.com/support/forums/security.html

            This security fix closes SCO incidents sr890248 fz529385
            erg712599.

    7. 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.

    8. Acknowledgments

            SCO would like to thank The National Infrastructure Security
            Co-Ordination Centre (NISCC), Paul Watson and Tim Newsham.

    ______________________________________________________________________________

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