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Full Discussion: Viruses in downloads/webs
Special Forums Cybersecurity Viruses in downloads/webs Post 27432 by LivinFree on Saturday 31st of August 2002 12:58:06 AM
Old 08-31-2002
Yeah, look out for bandwidth abusers - they might not know not to execute something they found lying around the internet. And as for attachments, I have seen more than one company not allow any through the mailserver in either direction. I have also seen some that only allow stuff like .txt, .html, and .doc though - although Macro virii aren't as popular as they used to be, it's still a very real threat.

As far as the internal webserver, that could be any one of a dozen or so variants... CodeRed, Nimda, etc... Those hit a lot of Windows-heavy companies quite hard. There were also some viruses that would infect the web server (IIS of course) and try to server out infected binaries by incuding an automatic redirect in a transparent image (or something like that).
 
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IMAGECOLORTRANSPARENT(3)						 1						  IMAGECOLORTRANSPARENT(3)

imagecolortransparent - Define a color as transparent

SYNOPSIS
int imagecolortransparent (resource $image, [int $color]) DESCRIPTION
Sets the transparent color in the given $image. PARAMETERS
o $ image -An image resource, returned by one of the image creation functions, such as imagecreatetruecolor(3). o $color - A color identifier created with imagecolorallocate(3). RETURN VALUES
The identifier of the new (or current, if none is specified) transparent color is returned. If $color is not specified, and the image has no transparent color, the returned identifier will be -1. EXAMPLES
Example #1 imagecolortransparent(3) example <?php // Create a 55x30 image $im = imagecreatetruecolor(55, 30); $red = imagecolorallocate($im, 255, 0, 0); $black = imagecolorallocate($im, 0, 0, 0); // Make the background transparent imagecolortransparent($im, $black); // Draw a red rectangle imagefilledrectangle($im, 4, 4, 50, 25, $red); // Save the image imagepng($im, './imagecolortransparent.png'); imagedestroy($im); ?> The above example will output something similar to:[NOT DISPLAYABLE MEDIA]Output of example : imagecolortransparent() NOTES
Note Transparency is copied only with imagecopymerge(3) and true color images, not with imagecopy(3) or pallete images. Note The transparent color is a property of the image, transparency is not a property of the color. Once you have set a color to be the transparent color, any regions of the image in that color that were drawn previously will be transparent. PHP Documentation Group IMAGECOLORTRANSPARENT(3)

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