[Full-Disclosure] JPEG GDI

str0ke_at_milw0rm.com
Date: 09/28/04

  • Next message: Harlan Carvey: "Re: [Full-Disclosure] How to obtain hostname lists" 
    To: full-disclosure@lists.netsys.com
Date: Tue, 28 Sep 2004 12:51:56 -0500 (CDT)

    Berry,

    I appreciate the information. I would think newgroup postings would be a
    little evil aswell.

    str0ke

    ////////////////

    Here's my understanding of it:

    The bug can be exploited whenever an application that relies on a
    vulnerable version of gdiplus.dll to render jpeg image files onscreen
    (Or, I suppose, in any other way that gdiplus.dll can be used to process
    jpegs - I'm not familiar with the GDI+ interface).

    That includes IE, Office applications, or anything that relies on a
    vulnerable gdiplus.dll file.

    What are the ramifications of this?

    I think that the predictions of worms based on this are a bit
    far-fetched. Would it be possible to create a jpeg that would copy
    itself to other drives on a shared network in an auto-executable
    position? I suppose so... however, it would be noisy and probably
    wouldn't be amazingly successful. Having a worm installer within a jpeg
    is plausable, though.

    I'd consider the following scenarios to be plausable:

          - JPEG in nefarious web page includes malicious code.
          - JPEG in SPAM includes malicious code.
          - JPEG in mass-mailer worm includes malicious code.
          - JPEG in ad pop-up/sidebar includes adware/spyware installer.
    (malicious)
          - Mass-mailer worm includes an attachment for a known vulnerable
    third-party program that trigger the GDI+ vuln. (how sucessful this
    might be would depend on the application being attacked.)
          - Download.Jecht style mass-compromise of websites to embed
    malicious code inside of JPEGs.

    Those are the most plausable scenarios I can think up for this.
    Anything else is unlikely in my thoughts.

                      -Barry

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