A spam message arrived today, and I opened it in SquirrelMail (so I could
report it to SpamCop). Imagine my surprise when I saw unsafe images
(images linked to remote sites) automatically display, even though I had
not clicked the "View Unsafe Images" link.

Curious, I examined the full html source of the message and discovered
that this spammer has found a method to defeat SquirrelMail's unsafe image
protection: all external URLs are encoded using hex entities.

Instead of the true URL of <img
src="http://www.1stspots.com/images/business.jpg";>, this spammer inserted
<img
src="&#104;&#116;&#116;&#112;&#58;&#47;&#47;&#119;&#119;&#119;&#46;&#49;&#115;&#116;&#115;&#112;&#111;&#116;&#115;&#46;&#99;&#111;&#109;/images/business.jpg">

Apparently SquirrelMail's unsafe image protection doesn't recognize the
encoded URL as an external URL, so the external images displayed
immediately.





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