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Bug #11403 calling session_start with protected images sends bogus headers
Submitted: 2001-06-11 14:12 UTC Modified: 2001-06-19 22:28 UTC
From: bondu at iowalab dot com Assigned:
Status: Closed Package: Session related
PHP Version: 4.0.4pl1 OS: linux
Private report: No CVE-ID: None
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From: bondu at iowalab dot com
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 [2001-06-11 14:12 UTC] bondu at iowalab dot com 
This script works as expected:
<?
$filename = "someimage.jpg";
$fd = fopen ($filename, "rb");
echo $contents = fread ($fd, filesize ($filename));
fclose ($fd);
?>

Adding sesion start sends bogus header infromation that makes IE think the file is a bitmap.  When right clicking on the image, IE thinks the file is of type .bmp and the Protocol is HTML.  Does the same thing for all image types. Adding header information in the script does not fix the problem, nor does setting default_mimetype to the "image/jpeg" in the script.

I was able to reproduce this on 4 different linux machines running 4.0.2, 4.0.4p1, and 4.0.5

 
<?
session_start();
$filename = "someimage.jpg";
$fd = fopen ($filename, "rb");
echo $contents = fread ($fd, filesize ($filename));
fclose ($fd);
?>

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 [2001-06-12 01:45 UTC] sniper@php.net 
This works:

<?
session_start();
$filename = "test.jpg";
$fd = fopen ($filename, "rb");
$contents = fread ($fd, filesize ($filename));
fclose ($fd);

Header ("Content-type: image/jpeg");
echo $contents;
?>
 [2001-06-12 13:08 UTC] bondu at iowalab dot com 
adding 
Header ("Content-type: image/jpeg");
does NOT fix the problem.
copy the "fixed" script to a new file name, and see that it does not work.

you are looking at cached version.  IE will cache the mimetype info associated with the image even if you clear your history.  I am able to reproduce this consistantly on multiple machines
 [2001-06-19 12:43 UTC] sniper@php.net 
1. I am NOT using IE here. I tested this with
IE now, and it works just fine.
2. Works also with Opera.
3. Works also with Mozilla.

I suggest you check your php.ini settings.
 [2001-06-19 12:44 UTC] sniper@php.net 
And update to php 4.0.5
 [2001-06-19 15:03 UTC] bondu at iowalab dot com 
adding 
session_cache_limiter("private");
before 
session_start();
fixed the problem.

<?
session_cache_limiter("private");
session_start();
$filename = "test.jpg";
$fd = fopen ($filename, "rb");
$contents = fread ($fd, filesize ($filename));
fclose ($fd);

Header ("Content-type: image/jpeg");
echo $contents;
?>
 [2001-06-19 22:28 UTC] sniper@php.net 
Just a note, this is problem only with IE.
Seems like it doesn't like all the cache preventing 
headers sent by session_start() but using 'private' cache
headers, it works. Go figure..
 
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