[NT] Microsoft Windows Land Attack Vulnerability (IPv6)

From: SecuriTeam (support_at_securiteam.com)
Date: 05/19/05

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Date: 19 May 2005 16:36:29 +0200

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      Microsoft Windows Land Attack Vulnerability (IPv6)
    ------------------------------------------------------------------------

    SUMMARY

    By sending a TCP packet with SYN flag set, source and destination IP
    address and source and destination port as of destination machine, results
    in 15-30 seconds DoS condition.

    DETAILS

    Vulnerable Systems:
     * Microsoft Windows XP SP 2
     * Microsoft Windows XP SP 1
     * Microsoft Windows XP
     * Microsoft Windows 2003 Server
     * Microsoft Windows 2003 Server SP 1
     * Microsoft Windows 2000 SP 4

    By sending single LAND packet to file server causes Windows explorer
    freezing on all workstations currently connected to the server. CPU on
    server goes 100%. Network monitor on the victim server sometimes can not
    even sniff malicious packet. Using tcpreplay to script this attack results
    in total collapse of the network.

    Workaround:
    Use build-in windows firewall to block open IPv6 ports (port 135 is open
    by default). Popular firewalls like zone alarm, sygate personal firewall
    and agnitum outpost firewall do not filter ipv6 so the attack has the same
    effect.

    ADDITIONAL INFORMATION

    The information has been provided by
    <mailto:koyot@moon.ondraszek.ds.polsl.gliwice.pl> Konrad Malewski .

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