[NT] ISS Server Sensor Denial of Service

From: SecuriTeam (support_at_securiteam.com)
Date: 09/07/03

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Date: 7 Sep 2003 11:05:43 +0200

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      ISS Server Sensor Denial of Service
    ------------------------------------------------------------------------

    SUMMARY

    By sending a properly formatted URL via SSL, an attacker can successfully
    shut down Microsoft's IIS service stopping all Web and FTP servers.

    DETAILS

    Vulnerable systems:
     * ISS Server Sensor version 7.0 XPU 20.16
     * ISS Server Sensor version 7.0 XPU 20.18

    Immune systems:
     * ISS Server Sensor version 7.0 XPU 20.19

    ISS server sensor 7.0 has the ability to plug into ISS via an ISAPI
    plug-in to allow for IDS on SSL traffic.

    By simply sending a properly formatted URL via SSL, the ISAPI filter will
    crash IIS shutting down the service entirely. IIS 5 may automatically
    restart the service when it detects that the service has stopped.

    Vendor Status:
    We contacted ISS on or about August 14 concerning this issue. ISS has
    since released XPU 20.19 that addresses this specific issue.

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:research@enteredge.com>
    EnterEdge Technology, LLC .

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