MS05-019 breaks TCP raw socket sends

From: Robin Keir (robin_at_KEIR.NET)
Date: 04/13/05

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    Date:         Tue, 12 Apr 2005 20:37:02 -0700
    To: NTBUGTRAQ@LISTSERV.NTBUGTRAQ.COM
    
    

    Today's bugfix MS05-019 ("Vulnerabilities in TCP/IP Could Allow Remote
    Code Execution and Denial of Service" - KB893066) appears to break TCP
    raw socket sends on XP (tested with SP1 and SP2). Windows Server 2003
    appears unaffected.

    It is a documented fact that TCP raw socket sends were disabled with XP
    SP2. This was easily circumvented by disabling the Windows Firewall
    service ("net stop sharedaccess"). It now appears that with the MS05-019
    hotfix a similar situation has arisen whereby TCP raw socket sends are
    prevented, not only in SP2 but also SP1 (and probably SP0). This does
    *not* seem to be able to be overcome by stopping the firewall service(s).

    I don't know if this was intentional but I don't see any reference to
    this behavior.

    Incidentally, with Windows Server 2003 MS had "accidentally" also
    disabled TCP raw socket sends as with XP SP2 until they were notified of
    this unintentional regression and "fixed" it in RC2 and the final
    release. One wonders whether they "accidentally" used a component from
    XP SP2 in this hotfix causing this undesirable behavior.

    --
    Robin
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