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Re: C file recoginzed as image file

From: Giorgos Keramidas
Subject: Re: C file recoginzed as image file
Date: Mon, 15 Jan 2007 08:10:07 +0200

On 2007-01-09 11:57, Vinicius Jose Latorre <address@hidden> wrote:
> Could a valid image file (GIF, JPG, PNG, etc.) with a valid file
> extension contain a virus?

Depending on what you mean by `a valid image', yes.

It is conceivable that someone with knowledge about the exact
format *and* a bug in one of the image libraries can construct a
valid image file which takes advantage of a bug in the image
processing libraries; typically a lack of range or size checks,
which can cause buffer overflows or other similar problems in
languages that allow this to happen.

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