UnixWare 7.1.4 UnixWare 7.1.3 UnixWare 7.1.1 : RPCBind updated to prevent remote Denial of Service attack

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                        SCO Security Advisory

Subject:                UnixWare 7.1.4 UnixWare 7.1.3 UnixWare 7.1.1 : RPCBind updated to prevent remote Denial of 
Service attack
Advisory number:        SCOSA-2005.31
Issue date:             2005 July 27
Cross reference:        sr894043 fz532477 erg712862 CAN-CAN-2005-2132
______________________________________________________________________________


1. Problem Description

        While testing UnixWare 7.x against CVE CAN-2001-1124, Yun
        Jonglim noticed that UnixWare rpcbind exhibits unexpected
        behaviour after successive attacks.

        When the UnixWare 7.x version of the RPC portmapper(rpcbind)
        receives an invalid portmap request from a remote (or local)
        host, it falls into a denial of service state and cannot
        respond. As a result, the RPC services will not operate
        normally.

        The Common Vulnerabilities and Exposures project
        (cve.mitre.org) has assigned the following names for these
        issues: CAN-CAN-2005-2132.


2. Vulnerable Supported Versions

        System                          Binaries
        ----------------------------------------------------------------------
        UnixWare 7.1.4 mp2              /usr/lib/tmp/libnsl.so
        UnixWare 7.1.3 mp5              /usr/lib/tmp/libnsl.so
        UnixWare 7.1.1 m5               /usr/lib/tmp/libnsl.so


3. Solution

        The proper solution is to install the latest packages.


4. UnixWare 7.1.4

        4.1 Location of Fixed Binaries

        ftp://ftp.sco.com/pub/updates/UnixWare/SCOSA-2005.31


        4.2 Verification

        MD5 (erg712862.714.pkg.Z) = 4c32902492be86b35f9daaa544a71187

        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:

        Download erg712862.714.pkg.Z to the /var/spool/pkg directory

        # uncompress /var/spool/pkg/erg712862.714.pkg.Z
        # pkgadd -d /var/spool/pkg/erg712862.714.pkg


5. UnixWare 7.1.3

        5.1 Location of Fixed Binaries

        ftp://ftp.sco.com/pub/updates/UnixWare/SCOSA-2005.31


        5.2 Verification

        MD5 (erg712862.713.pkg.Z) = 63ed84f84943604a992a1a555ad393f1

        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:

        Download erg712862.713.pkg.Z to the /var/spool/pkg directory

        # uncompress /var/spool/pkg/erg712862.713.pkg.Z
        # pkgadd -d /var/spool/pkg/erg712862.713.pkg


6. UnixWare 7.1.1

        6.1 Location of Fixed Binaries

        ftp://ftp.sco.com/pub/updates/UnixWare/SCOSA-2005.31


        6.2 Verification

        MD5 (erg712862.711.pkg.Z) = 4ca1b39e940c2bbff8510027951efe5b

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


        6.3 Installing Fixed Binaries

        Upgrade the affected binaries with the following sequence:

        Download erg712862.711.pkg.Z to the /var/spool/pkg directory

        # uncompress /var/spool/pkg/erg712862.711.pkg.Z
        # pkgadd -d /var/spool/pkg/erg712862.711.pkg


7. References

        Specific references for this advisory:
                http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-CAN-2005-2132

        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 sr894043 fz532477
        erg712862.


8. 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.


9. Acknowledgments

        The SCO Group would like to thank Yun Jonglim for his work
        in discovering and describing this defect so well.

______________________________________________________________________________

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