[Full-disclosure] SCOSA-2006.4 OpenServer 5.0.6 OpenServer 5.0.7 : TCP Remote ICMP Denial Of Service Vulnerabilities

[security@xxxxxxx]

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                        SCO Security Advisory

Subject:                OpenServer 5.0.6 OpenServer 5.0.7 : TCP Remote ICMP 
Denial Of Service Vulnerabilities
Advisory number:        SCOSA-2006.4
Issue date:             2006 January 04
Cross reference:        sr892503 fz530662 erg712759
                        CVE-2004-0790 CVE-2004-0791 CVE-2004-1060
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1. Problem Description

        The Internet Control Message Protocol is used to alert hosts on
        a network about certain situations, and the hosts then take
        automatic action to prevent network failures or to improve
        transport efficiency. The RFC recommends no security checking
        for in-bound ICMP messages, so long as a related connection
        exists, and may potentially allow several different Denials of
        Service. The following individual attacks are reported:

        A blind connection-reset attack is reported, which takes
        advantage of the specification that describes that on receiving
        a 'hard' ICMP error, the corresponding connection should be
        aborted. A remote attacker may terminate target TCP connections
        and deny service for legitimate users.

        The Common Vulnerabilities and Exposures project (cve.mitre.org)
        has assigned the name CVE-2004-0790 to this issue.

        An ICMP Source Quench attack is reported, which exploits the
        specification that a host must react to ICMP Source Quench
        messages by slowing transmission on the associated connection. A
        remote attacker may effectively degrade performance for a
        legitimate connection.

        The Common Vulnerabilities and Exposures project (cve.mitre.org)
        has assigned the name CVE-2004-0791 to this issue.

        A suitable forged ICMP PMTUD message may be used to reduce the
        MTU for a given connection in a similar manner.

        The Common Vulnerabilities and Exposures project (cve.mitre.org)
        has assigned the name CVE-2004-1060 to this issue.


2. Vulnerable Supported Versions

        System                          Binaries
        ----------------------------------------------------------------------
        OpenServer 5.0.6                ip and tcp drivers
        OpenServer 5.0.7                ip and tcp drivers


3. Solution

        The proper solution is to install the latest packages.


4. OpenServer 5.0.6

        4.1 Location of Fixed Binaries

        ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2006.4


    4.2 Verification

        MD5 (VOL.000.000) = 03ed8e901780e1535c113efeba72d8cd

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


    4.3 Installing Fixed Binaries

        The following packages should be installed on your system before
        you install this fix:

                RS506A
                OSS646
                ERG711746: 
ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2005.3/SCOSA-2005.3.txt
                ERG712606: 
ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2005.9/SCOSA-2005.9.txt

        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. OpenServer 5.0.7

        5.1 Location of Fixed Binaries

        ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2006.4


    5.2 Verification

        MD5 (VOL.000.000) = 03ed8e901780e1535c113efeba72d8cd

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


    5.3 Installing Fixed Binaries

        The following package should be installed on your system before
        you install this fix:

                OSR507MP4 - OpenServer 5, Release 5.0.7 Maintenance Pack 4

        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.


6. References

        Specific references for this advisory:
                http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-0790
                http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-0791
                http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-1060

        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 sr892503 fz530662
        erg712759.


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

        The SCO Group would like to thank Fernando Gont for reporting
        these issues.

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