[NT] Microsoft ISA Server 2000 DoS

From: SecuriTeam (support_at_securiteam.com)
Date: 06/02/05

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Date: 2 Jun 2005 15:49:46 +0200

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      Microsoft ISA Server 2000 DoS
    ------------------------------------------------------------------------

    SUMMARY

    " <http://www.microsoft.com/isaserver/default.mspx> Microsoft Internet
    Security and Acceleration (ISA) Server is the advanced stateful packet and
    application-layer inspection firewall, virtual private network (VPN), and
    Web cache solution that enables enterprise customers to easily maximize
    existing information technology (IT) investments by improving network
    security and performance."

    Microsoft Internet Security and Acceleration Server's Firewall crashes
    when heavy network traffic is received from a SecureNAT client.

    DETAILS

    Vulnerable Systems:
     * SA Server 2000 and ISA Server 2000 Service Pack 2 (SP2) Wspsrv.exe
    version 3.0.1200.411 and prior

    Workaround:
    Limit the size of traffic being handled by the ISA server for each
    SecureNAT client contacting it.

    Disclosure Timeline:
    01-06-2005 - Vulnerability researched
    02-06-2005 - Security companies and several CERT units contacted, advisory
    published, link to advisory sent to security companies and several CERT
    units

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:juha-matti.laurio@netti.fi>
    Juha-Matti Laurio .
    The original article can be found at:
    <http://www.networksecurity.fi/advisories/windows-isa-firewall.html>
    http://www.networksecurity.fi/advisories/windows-isa-firewall.html
    The vendor advisory can be found at :
    <http://support.microsoft.com/kb/894864/EN-US/>
    http://support.microsoft.com/kb/894864/EN-US/

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