UnixWare 7.1.3 UnixWare 7.1.1 : Vulnerabilities in long-lived TCP connections / Rose attack

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                        SCO Security Advisory

Subject:                UnixWare 7.1.3 UnixWare 7.1.1 : Vulnerabilities in 
long-lived TCP connections / Rose attack
Advisory number:        SCOSA-2005.14
Issue date:             2005 February 07
Cross reference:        sr890247 fz529384 erg712598 sr890286 fz529414 erg712605
______________________________________________________________________________


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. 

        Reference : NISCC Vulnerability Advisory 236929
        Reference : CERT Technical Cyber Security Alert TA04-111A

        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
        ----------------------------------------------------------------------
        UnixWare 7.1.3                  /etc/conf/pack.d/inet/Driver_atup.o
                                        /etc/conf/pack.d/inet/Driver_mp.o
                                        /etc/conf/pack.d/inet/space.c
                                        /usr/include/netinet/ip_var.h

        UnixWare 7.1.1                  /etc/conf/pack.d/inet/Driver_atup.o
                                        /etc/conf/pack.d/inet/Driver_mp.o
                                        /etc/conf/pack.d/inet/space.c
                                        /usr/include/netinet/ip_var.h

3. Solution

        The proper solution is to install the latest packages.


4. UnixWare 7.1.3

        4.1 Location of Fixed Binaries

        ftp://ftp.sco.com/pub/updates/UnixWare/SCOSA-2005.14

        4.2 Verification

        MD5 (erg712598.pkg.Z) = c037e34427caf7f752eac2680f7dd29a

        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 erg712598.pkg.Z to the /var/spool/pkg directory

        # uncompress /var/spool/pkg/erg712598.pkg.Z
        # pkgadd -d /var/spool/pkg/erg712598.pkg


5. UnixWare 7.1.1

        5.1 Location of Fixed Binaries

        ftp://ftp.sco.com/pub/updates/UnixWare/SCOSA-2005.14


        5.2 Verification

        MD5 (erg712598.711.pkg.Z) = 010281cae30aec75daa9b03b1ebbb522

        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 erg712598.711.pkg.Z to the /var/spool/pkg directory

        # uncompress /var/spool/pkg/erg712598.711.pkg.Z
        # pkgadd -d /var/spool/pkg/erg712598.711.pkg


6. References

        Specific references for this advisory:
                http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0230 
                
http://www.uniras.gov.uk/niscc/docs/al-20040420-00199.html?lang=en 
                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 sr890247 fz529384
        erg712598 sr890286 fz529414 erg712605.


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 NISCC, Steve Bellovin, Rob Thomas
        and Paul Watson, Cisco Systems Inc. and Juniper Networks
        Inc.

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