[Full-disclosure] SCOSA-2005.65 OpenServer 6.0.0 : TCP Denial of Service Vulnerability

[security@xxxxxxx]

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                        SCO Security Advisory

Subject:                OpenServer 6.0.0 : TCP Denial of Service Vulnerability
Advisory number:        SCOSA-2005.65
Issue date:             2005 December 22
Cross reference:        sr895069 fz533038 erg712959
                        CVE-2005-0356 VU#637934
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1. Problem Description

        TCP does not adequately validate segments before updating
        timestamp value allowing a remote attacker to arbitrarily modify
        host timestamp values that will in turn cause TCP connections to
        abort/drop segments, leading to a denial-of-service condition.

        The Common Vulnerabilities and Exposures project (cve.mitre.org)
        has assigned the name CVE-2005-0356 to this issue.


2. Vulnerable Supported Versions

        System                          Binaries
        ----------------------------------------------------------------------
        OpenServer 6.0.0                /etc/conf/pack.d/inet/Driver.o
                                        /etc/conf/pack.d/inet/space.c


3. Solution

        The proper solution is to install the latest packages.


4. OpenServer 6.0.0

        4.1 Location of Fixed Binaries

        ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2005.65


    4.2 Verification

        MD5 (VOL.000.000) = d03297c53c5eec5c7c83b0f0525a5b36

        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 a directory.

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


5. References

        Specific references for this advisory:
                http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-0356
                http://www.kb.cert.org/vuls/id/VU#637934
                http://www.securityfocus.com/bid/13676

        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 sr895069 fz533038
        erg712959.


6. 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.


7. Acknowledgments

        SCO would like to thank Noritoshi Demizu for researching and
        reporting this vulnerability.

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