Author Topic: Beware images that are not images!  (Read 3358 times)

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Offline Anne

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Beware images that are not images!
« on: April 02, 2005, 04:16:57 PM »
Be careful how you view your JPG and GIF files (from now on)...

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Security specialist ISS said contributors to hacker mailing lists have recently been discussing new techniques to bypass firewalls by mislabelling general HTML files as JPEGs. Steven Darrall, senior consultant at ISS X-Force Security Assessment Services, said the problem is caused by Microsoft's Internet Explorer (IE) web browser automatically opening files labelled with .jpg or .gif extensions. "If the file does not contain an image, IE will try and guess the content," Darrall said.

The news could explain the recent increase in the number of spam-like emails that contain JPEG files that do not actually include an image.
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« Last Edit: May 05, 2005, 08:55:01 PM by Anne »
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