Security Update: [CSSA-2003-SCO.7] UnixWare 7.1.1 Open UNIX 8.0.0 : Several vulnerabilities in XDR/RPC routines

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                        SCO Security Advisory

Subject:                UnixWare 7.1.1 Open UNIX 8.0.0 : Several vulnerabilities in XDR/RPC routines
Advisory number:        CSSA-2003-SCO.7
Issue date:             2003 March 19
Cross reference:
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1. Problem Description

         The implementation of xdr_array can be tricked into writing
         beyond the buffers it allocated when deserializing the XDR
         stream.

         The xdrmem_getbytes() function in the XDR library provided by
         Sun Microsystems contains an integer overflow that can lead
         to improperly sized dynamic memory allocation. 


2. Vulnerable Supported Versions

        System                          Binaries
        ----------------------------------------------------------------------
        UnixWare 7.1.1                  /etc/conf/pack.d/krpc/Driver_atup.o
                                        /etc/conf/pack.d/krpc/Driver_mp.o
                                        /usr/lib/tmp/libnsl.so

        Open UNIX 8.0.0                 /etc/conf/pack.d/krpc/Driver_atup.o
                                        /etc/conf/pack.d/krpc/Driver_mp.o
                                        /usr/lib/tmp/libnsl.so


3. Solution

        The proper solution is to install the latest packages.


4. UnixWare 7.1.1

        4.1 Location of Fixed Binaries

        ftp://ftp.sco.com/pub/updates/OpenUNIX/CSSA-2003-SCO.7


        4.2 Verification

        MD5 (erg712182.pkg.Z) = a696dd236701b8b643e5f37660499dbe

        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:


        NOTE: THE uw711m2 MAINTENANCE SUPPLEMENT MUST BE INSTALLED
        PRIOR TO INSTALLING THIS UPDATE.

        Download erg712182.pkg.Z to the /var/spool/pkg directory

        # uncompress /var/spool/pkg/erg712182.pkg.Z
        # pkgadd -d /var/spool/pkg/erg712182.pkg


5. Open UNIX 8.0.0

        5.1 Location of Fixed Binaries

        ftp://ftp.sco.com/pub/updates/OpenUNIX/CSSA-2003-SCO.7


        5.2 Verification

        MD5 (erg712182b.pkg.Z) = 9e973d410d7a9d9f0df971b0ceb7d140

        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:


        NOTE: THE ou800pk4 MAINTENANCE SUPPLEMENT MUST BE INSTALLED
        PRIOR TO INSTALLING THIS UPDATE.

        Download erg712182b.pkg.Z to the /var/spool/pkg directory

        # uncompress /var/spool/pkg/erg712182b.pkg.Z
        # pkgadd -d /var/spool/pkg/erg712182b.pkg


6. References

        Specific references for this advisory:

                xdr_array:

                http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0391
                http://www.cert.org/advisories/CA-2002-25.html
                http://www.kb.cert.org/vuls/id/192995
                http://bvlive01.iss.net/issEn/delivery/xforce/alertdetail.jsp?oid=20823

                xdrmem_getbytes:

                http://www.kb.cert.org/vuls/id/516825


        SCO security resources:

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

        This security fix closes SCO incidents sr872623, sr867443,
        fz526861, fz525725, erg712182, erg501642 .


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. Acknowledgements

         ISS.net discovered and researched the xdr_array vulnerability.
         Riley Hassell of eEye discovered and researched the
         xdrmem_getbytes vulnerability.

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