[NT] Internet Explorer Remote Dos (Memory Access Violation)

From: SecuriTeam (support_at_securiteam.com)
Date: 05/09/04

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      Internet Explorer Remote Dos (Memory Access Violation)
    ------------------------------------------------------------------------

    SUMMARY

    Internet Explorer is a very popular web browser written by Microsoft. A
    bug in the way IE handles paths to drives in the body of HTML tags can
    lead to memory access.

    DETAILS

    Vulnerable Systems:
     * Internet Explorer version 6.0.2800

    By using onLoad and window.location it is possible to direct IE to open a
    connection, file or web page, during the loading of the body of the HTML
    code (NOTE: The onLoad directive can be applied to almost any tag).

    For example, directing IE to open a file on the local file system is done
    in the following manner: file://c:\filename

    If the link contains an invalid drive letter encoded in hexadecimal
    values, the mentioned vulnerability is triggered. This vulnerability
    overwrites 3 registers ECX, EDX, and EDI.

    When we use an abnormal drive name we control the first 16bits of EDX and
    EDI. When the web page with the malicious code loads, the three registers
    are overwritten which also results in corruption the IE Entries' registry.

    Example:
    By directing a user to the following path: \xff:\filename (it is also
    possible to pass hex values instead of a filename), it is possible to
    trigger the vulnerability.

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:me@cipher.org.uk>
    E.Kellinis.

    ========================================

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