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Thread: Vulnerability: M$ IE File Extension Faking or Spoofing

  1. #1
    Fastest Thing Alive s0nIc's Avatar
    Join Date
    Sep 2001

    Vulnerability: M$ IE File Extension Faking or Spoofing

    Microsoft Internet Explorer MIME Type File Extension Spoofing Vulnerability

    Microsoft Internet Explorer uses the Content-Type and Content- Disposition HTML header fields to determine the file type of non- HTML files referenced by a website. These two content headers make up the MIME type of the field.

    It is possible to insert information into the Content-Type and Content-Disposition fields that would tell Internet Explorer that a file being downloaded is of a different type than it actually is. This would not cause the file to be executed automatically, but could trick a vulnerable user into believing that they are downloading a text file instead of an executable file.

    This vulnerablility was originally believed to be the same as the one reported in Bugtraq ID 3597, but was later found to be a different method of achieving the same goal.

    Remote: Yes

    Exploit: There is no exploit code.

    Solution: Microsoft has released a patch to address this issue:

    Microsoft Internet Explorer 5.0.1SP2:

    Microsoft Patch q316059_IE 5.01 US/q316059.exe

    Microsoft Internet Explorer 5.5SP2:

    Microsoft Patch q316059_IE 5.5SP2 EN-US/q316059.exe

    Microsoft Internet Explorer 5.5SP1:

    Microsoft Patch q316059_IE 5.5SP1 EN-US/q316059.exe

    Microsoft Internet Explorer 6.0:

    Microsoft Patch q316059_IE6 US/q316059.exe

  2. #2
    Senior Member
    Join Date
    Jan 2002
    isnt that thesame as the "%%00" null byte bug?

    I do remember someone posting about the null byte bug which helps crackers/hackers fake the file names and extensions but i dont remember where in THIS huge archive of thread.

    Though i would think this vulnerability affects greatly the home users or network workstations than corporate servers since its rarely that an ADMIN would use the server to surf the internet.

    Still it can contribute to the DDoS task of a cracker. Thanks for informing us.

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