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From: David Litchfield (davidngssoftware.com)
Date: Wed May 29 2002 - 17:54:51 CDT

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    NGSSoftware Insight Security Research Advisory

    Name: Macromedia JRun 3.1

    Systems Affected: IIS 4/5 on WinNT 4/Win2K

    Severity: High Risk

    Category: Remote System Buffer Overrun

    Vendor URL: http://www.macromedia.com

    Author: David Litchfield (davidngssoftware.com)

    Advisory URL: http://www.ngssoftware.com/advisories/jrun.txt

    Date: 29th May 2002

    Advisory number: #NISR29052002



    Macromedia's JRun, previously owned by Allaire, is a J2EE Server designed to
    run on web servers to deliver java based online applications. The Win32
    version 3.1 contains a remotely exploitable buffer overrun vulnerability
    that allows an attacker to gain complete control of the server in question.



    When JRun is installed, an ISAPI filter/application is stored in the
    /scripts virtual directory. If a request comes into the server for a .jsp
    resource the JRun filter handles the request. Further, if the ISAPI DLL is
    accessed directly it acts as an application. By making a request to the DLL
    with an overly long Host header field, a saved return address is overwritten
    on the stack allowing an attacker to gain control over the process'
    execution. As the jrun DLL is loaded into the address space of the web
    service process, inetinfo.exe, on both Internet Information Server 4 and 5,
    any code supplied in an exploit will run in the security context of the
    local SYSTEM account.

    Fix Information


    NGSSoftware alerted Macromedia to this problem at the start of April and
    since then JRun version 4 has been released. This version should contain the
    fix to prevent this overrun and as such customers are advised to upgrade as
    soon as possible. In the interim, one should consider using a tool such as
    Sanctum's AppSheild or eEye's SecureIIS that help prevent such attacks.

    A check for this issue has been added to Typhon II, NGSSoftware's
    vulnerability assessment scanner, of which more information is available
    from the NGSSite : http://www.ngssoftware.com/.

    Further Information


    For further information about the scope and effects of buffer overflows,
    please see